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Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
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1

Raman lidar and MPL Measurements during ALIVE  

NLE Websites -- All DOE Office Websites (Extended Search)

Raman lidar and MPL Measurements during ALIVE Raman lidar and MPL Measurements during ALIVE Ferrare, Richard NASA Langley Research Center Turner, David University of Wisconsin-Madison Flynn, Connor Pacific Northwest National Laboratory Petty, Diana Pacific Northwest National Laboratory Mendoza, Albert Pacific Northwest National Laboratory Clayton, Marian NASA Langley Research Center Schmid, Beat Bay Area Environmental Research Institute Category: Field Campaigns Analysis of the aerosol and water vapor data collected by the Raman lidar during the May 2003 Aerosol IOP indicated that the sensitivity of the lidar was significantly lower than when the lidar was initially deployed. This decrease in sensitivity contributed to a significant high bias of the Raman lidar aerosol extinction measurements in relation to airborne Sun

2

Raman Lidar Measurements of Aerosols and Water Vapor During the...  

NLE Websites -- All DOE Office Websites (Extended Search)

Raman Lidar Measurements of Aerosols and Water Vapor During the May 2003 Aerosol IOP R. A. Ferrare National Aeronautics and Space Administration Langley Research Center Hampton,...

3

Liquid Water Cloud Measurements Using the Raman Lidar Technique: Current Understanding and Future Research Needs  

Science Conference Proceedings (OSTI)

This paper describes recent work in the Raman lidar liquid water cloud measurement technique. The range-resolved spectral measurements at the National Aeronautics and Space Administration Goddard Space Flight Center indicate that the Raman ...

Tetsu Sakai; David N. Whiteman; Felicita Russo; David D. Turner; Igor Veselovskii; S. Harvey Melfi; Tomohiro Nagai; Yuzo Mano

2013-07-01T23:59:59.000Z

4

Observation of Atmospheric Fronts Using Raman Lidar Moisture Measurements  

Science Conference Proceedings (OSTI)

This paper presents the results of a field program using a ground-based Raman lidar system to observe changes in moisture profiles as a cold and a warm front passed over the NASA/Goddard Space Flight Center in Greenbelt, Maryland. The lidar ...

S. H. Melfi; D. Whiteman; R. Ferrare

1989-09-01T23:59:59.000Z

5

Simultaneous Measurements of Atmospheric Water Vapor with MIR, Raman Lidar, and Rawinsondes  

Science Conference Proceedings (OSTI)

Simultaneous measurements of atmospheric water vapor were made by the Millimeter-wave Imaging Radiometer (MIR), Raman lidar, and rawinsondes. Two types of rawinsonde sensor packages (AIR and Vaisala) were carried by the same balloon. The measured ...

J. R. Wang; S. H. Melfi; P. Racette; D. N. Whitemen; L. A. Chang; R. A. Ferrare; K. D. Evans; F. J. Schmidlin

1995-07-01T23:59:59.000Z

6

Raman Lidar Profiling of Atmospheric Water Vapor: Simultaneous Measurements with Two Collocated Systems  

Science Conference Proceedings (OSTI)

Raman lidar is a loading candidate for providing the detailed space-and time-resolved measurements of water vapor needed by a variety of atmospheric studies. Simultaneous measurements of atmospheric watervapor are described using two collocated ...

J. E. M. Goldsmith; Scott E. Bisson; Richard A. Ferrare; Keith D. Evans; David N. Whiteman; S. H. Melfi

1994-06-01T23:59:59.000Z

7

Multiparameter Raman Lidar Measurements for the Characterization of a Dry Stratospheric Intrusion Event  

Science Conference Proceedings (OSTI)

The University of Basilicata Raman lidar system (BASIL) is operational in Potenza, Italy, and it is capable of performing high-resolution and accurate measurements of atmospheric temperature and water vapor based on the application of the ...

Paolo Di Girolamo; Donato Summa; Rossella Ferretti

2009-09-01T23:59:59.000Z

8

Water Vapor Measurements by Howard University Raman Lidar during the WAVES 2006 Campaign  

Science Conference Proceedings (OSTI)

Water vapor mixing ratio retrieval using the Howard University Raman lidar is presented with emphasis on three aspects: (i) comparison of the lidar with collocated radiosondes and Raman lidar, (ii) investigation of the relationship between ...

M. Adam; B. B. Demoz; D. D. Venable; E. Joseph; R. Connell; D. N. Whiteman; A. Gambacorta; J. Wei; M. W. Shephard; L. M. Miloshevich; C. D. Barnet; R. L. Herman; J. Fitzgibbon

2010-01-01T23:59:59.000Z

9

Raman Lidar (RL) Handbook  

SciTech Connect

The Raman lidar at the ARM Climate Research Facility (ACRF) Southern Great Plains (SGP) Central Facility (SGPRL) is an active, ground-based laser remote sensing instrument that measures height and time resolved profiles of water vapor mixing ratio and several cloud- and aerosol-related quantities. The system is a non-commercial custom-built instrument developed by Sandia National Laboratories specifically for the ARM Program. It is fully computer automated, and will run unattended for many days following a brief (~5-minute) startup period. The self-contained system (requiring only external electrical power) is housed in a climate-controlled 8’x8’x20’ standard shipping container.

Newsom, RK

2009-03-01T23:59:59.000Z

10

Long-Term Evaluation of Temperature Profiles Measured by an Operational Raman Lidar  

Science Conference Proceedings (OSTI)

This study investigates the accuracy and calibration stability of temperature profiles derived from an operational Raman lidar over a two-year period from 1 January 2009 through 31 December 2010. The lidar, which uses the rotational Raman ...

Rob K. Newsom; David D. Turner; John E. M. Goldsmith

11

Long-Term Evaluation of Temperature Profiles Measured by an Operational Raman Lidar  

Science Conference Proceedings (OSTI)

This study investigates the accuracy and calibration stability of temperature profiles derived from an operational Raman lidar over a 2-yr period from 1 January 2009 to 31 December 2010. The lidar, which uses the rotational Raman technique for ...

Rob K. Newsom; David D. Turner; John E. M. Goldsmith

2013-08-01T23:59:59.000Z

12

Airborne and Ground-Based Measurements Using a High-Performance Raman Lidar  

Science Conference Proceedings (OSTI)

A high-performance Raman lidar operating in the UV portion of the spectrum has been used to acquire, for the first time using a single lidar, simultaneous airborne profiles of the water vapor mixing ratio, aerosol backscatter, aerosol extinction, ...

David N. Whiteman; Kurt Rush; Scott Rabenhorst; Wayne Welch; Martin Cadirola; Gerry McIntire; Felicita Russo; Mariana Adam; Demetrius Venable; Rasheen Connell; Igor Veselovskii; Ricardo Forno; Bernd Mielke; Bernhard Stein; Thierry Leblanc; Stuart McDermid; Holger Vömel

2010-11-01T23:59:59.000Z

13

A Comparison of Water Vapor Measurements Made by Raman Lidar and Radiosondes  

Science Conference Proceedings (OSTI)

This paper examines the calibration characteristics of the NASA/GSFC Raman water vapor lidar during three field experiments that occurred between 1991 and 1993. The lidar water vapor profiles are calibrated using relative humidity profiles ...

R. A. Ferrare; S. H. Melfi; D. N. Whiteman; K. D. Evans; F. J. Schmidlin; D. O'C. Starr

1995-12-01T23:59:59.000Z

14

Demonstration Measurements of Water Vapor, Cirrus Clouds, and Carbon Dioxide Using a High-Performance Raman Lidar  

Science Conference Proceedings (OSTI)

Profile measurements of atmospheric water vapor, cirrus clouds, and carbon dioxide using the Raman Airborne Spectroscopic lidar (RASL) during ground-based, upward-looking tests are presented here. These measurements improve upon any previously ...

David N. Whiteman; Kurt Rush; Igor Veselovskii; Martin Cadirola; Joseph Comer; John R. Potter; Rebecca Tola

2007-08-01T23:59:59.000Z

15

Raman Lidar Measurements during the International H2O Project. Part I: Instrumentation and Analysis Techniques  

Science Conference Proceedings (OSTI)

The NASA Goddard Space Flight Center (GSFC) Scanning Raman Lidar (SRL) participated in the International H2O Project (IHOP), which occurred in May and June 2002 in the midwestern part of the United States. The SRL received extensive optical ...

D. N. Whiteman; B. Demoz; K. Rush; G. Schwemmer; B. Gentry; P. Di Girolamo; J. Comer; I. Veselovskii; K. Evans; S. H. Melfi; Z. Wang; M. Cadirola; B. Mielke; D. Venable; T. Van Hove

2006-02-01T23:59:59.000Z

16

Twenty-Four-Hour Raman Lidar Water Vapor Measurements during the Atmospheric Radiation Measurement Program’s 1996 and 1997 Water Vapor Intensive Observation Periods  

Science Conference Proceedings (OSTI)

Prior to the Atmospheric Radiation Measurement program’s first water vapor intensive observation period (WVIOP) at the Cloud and Radiation Testbed site near Lamont, Oklahoma, an automated 24-h Raman lidar was delivered to the site. This ...

D. D. Turner; J. E. M. Goldsmith

1999-08-01T23:59:59.000Z

17

Posters Scanning Raman Lidar Measurements of Atmospheric Water Vapor and Aerosols  

NLE Websites -- All DOE Office Websites (Extended Search)

5 5 Posters Scanning Raman Lidar Measurements of Atmospheric Water Vapor and Aerosols R. A. Ferrare and K. D. Evans (a) Hughes STX Corporation Lanham, Maryland S. H. Melfi and D. N. Whiteman NASA/Goddard Space Flight Center Greenbelt, Maryland The principal objective of the Department of Energy's (DOE) Atmospheric Radiation Measurement Program (ARM) is to develop a better understanding of the atmospheric radiative balance in order to improve the parameterization of radiative processes in general circulation models (GCMs) which are used to study climate change. Meeting this objective requires detailed measurements of both water vapor and aerosols since these atmospheric constituents affect the radiation balance directly, through scattering and absorption of solar and

18

Raman Lidar Measurements during the International H2O Project. Part II: Case Studies  

Science Conference Proceedings (OSTI)

The NASA GSFC Scanning Raman Lidar (SRL) participated in the International H2O Project (IHOP) that occurred in May and June 2002 in the midwestern part of the United States. The SRL system configuration and methods of data analysis were described ...

D. N. Whiteman; B. Demoz; G. Schwemmer; B. Gentry; P. Di Girolamo; D. Sabatino; J. Comer; I. Veselovskii; K. Evans; R-F. Lin; Z. Wang; A. Behrendt; V. Wulfmeyer; E. Browell; R. Ferrare; S. Ismail; J. Wang

2006-02-01T23:59:59.000Z

19

Comparisons of Raman Lidar Measurements of Tropospheric Water Vapor Profiles with Radiosondes, Hygrometers on the Meteorological Observation Tower, and GPS at Tsukuba, Japan  

Science Conference Proceedings (OSTI)

The vertical distribution profiles of the water vapor mixing ratio (w) were measured by Raman lidar at the Meteorological Research Institute, Japan, during the period from 2000 to 2004. The measured values were compared with those obtained with ...

Tetsu Sakai; Tomohiro Nagai; Masahisa Nakazato; Takatsugu Matsumura; Narihiro Orikasa; Yoshinori Shoji

2007-08-01T23:59:59.000Z

20

Comments on ''Accuracy of Raman lidar water vapor calibration and its applicability to long-term measurements''  

Science Conference Proceedings (OSTI)

In a recent publication, Leblanc and McDermid [Appl. Opt., 47, 5592 (2008)]APOPAI0003-693510.1364/AO.47.005592 proposed a hybrid calibration technique for Raman water vapor lidar involving a tungsten lamp and radiosondes. Measurements made with the lidar telescope viewing the calibration lamp were used to stabilize the lidar calibration determined by comparison with radiosonde. The technique provided a significantly more stable calibration constant than radiosondes used alone. The technique involves the use of a calibration lamp in a fixed position in front of the lidar receiver aperture. We examine this configuration and find that such a configuration likely does not properly sample the full lidar system optical efficiency. While the technique is a useful addition to the use of radiosondes alone for lidar calibration, it is important to understand the scenarios under which it will not provide an accurate quantification of system optical efficiency changes. We offer examples of these scenarios. Scanning of the full telescope aperture with the calibration lamp can circumvent most of these limitations. Based on the work done to date, it seems likely that the use of multiple calibration lamps in different fixed positions in front of the telescope may provide sufficient redundancy for long-term calibration needs. Further full-aperture scanning experiments, performed over an extended period of time, are needed to determine a ''best practice'' for the use of multiple calibration lamps in the hybrid technique.

Whiteman, David N.; Venable, Demetrius; Landulfo, Eduardo

2011-05-20T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

LOSA-M2 aerosol Raman lidar  

SciTech Connect

The scanning LOSA-M2 aerosol Raman lidar, which is aimed at probing atmosphere at wavelengths of 532 and 1064 nm, is described. The backscattered light is received simultaneously in two regimes: analogue and photon-counting. Along with the signals of elastic light scattering at the initial wavelengths, a 607-nm Raman signal from molecular nitrogen is also recorded. It is shown that the height range of atmosphere probing can be expanded from the near-Earth layer to stratosphere using two (near- and far-field) receiving telescopes, and analogue and photon-counting lidar signals can be combined into one signal. Examples of natural measurements of aerosol stratification in atmosphere along vertical and horizontal paths during the expeditions to the Gobi Desert (Mongolia) and Lake Baikal areas are presented.

Balin, Yu S; Bairashin, G S; Kokhanenko, G P; Penner, I E; Samoilova, S V [V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk (Russian Federation)

2011-10-31T23:59:59.000Z

22

Comparison of Raman Lidar Observations of Water Vapor with COSMO-DE Forecasts during COPS 2007  

Science Conference Proceedings (OSTI)

Water vapor measurements with the multiwavelength Raman lidar Backscatter Extinction Lidar-Ratio Temperature Humidity Profiling Apparatus (BERTHA) were performed during the Convective and Orographically-induced Precipitation Study (COPS) in the ...

Christian Herold; Dietrich Althausen; Detlef Müller; Matthias Tesche; Patric Seifert; Ronny Engelmann; Cyrille Flamant; Rohini Bhawar; Paolo Di Girolamo

2011-12-01T23:59:59.000Z

23

ARM - PI Product - Raman lidar/AERI PBL Height Product  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsRaman lidarAERI PBL Height Product Comments? We would love to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : Raman lidarAERI PBL...

24

Raman Lidar Profiles–Temperature (RLPROFTEMP) Value-Added Product  

Science Conference Proceedings (OSTI)

The purpose of this document is to describe the Raman Lidar Profiles–Temperature (RLPROFTEMP) value-added product (VAP) and the procedures used to derive atmospheric temperature profiles from the raw RL measurements. Sections 2 and 4 describe the input and output variables, respectively. Section 3 discusses the theory behind the measurement and the details of the algorithm, including calibration and overlap correction.

Newsom, RK; Sivaraman, C; McFarlane, SA

2012-10-31T23:59:59.000Z

25

Simultaneous analog and photon counting detection for Raman lidar  

Science Conference Proceedings (OSTI)

The Atmospheric Radiation Measurement program Raman Lidar was upgraded in 2004 with a new data system that provides simultaneous measurements of both the photomultiplier analog output voltage and photon counts. This paper describes recent improvements to the algorithm used to merge these two signals into a single signal with improved dynamic range. The impact of modifications to the algorithm are evaluated by comparing profiles of water vapor mixing ratio from the lidar with sonde measurements. The modifications that were implemented resulted in a reduction of the mean bias in the daytime mixing ratio from a 4% dry bias to well within 1%.

Newsom, Rob K.; Turner, David D.; Mielke, Bernd; Clayton, Marian F.; Ferrare, Richard; Sivaraman, Chitra

2009-07-10T23:59:59.000Z

26

The Development of a Scanning Raman Water Vapor Lidar for Boundary Layer and Tropospheric Observations  

Science Conference Proceedings (OSTI)

A scanning, ultraviolet, Raman water vapor lidar designed primarily for boundary layer measurements has been built and operated by the Los Alamos National Laboratory Ground-Based Earth Observing Network team. The system provides high temporal and ...

W. E. Eichinger; D. I. Cooper; P. R. Forman; J. Griegos; M. A. Osborn; D. Richter; L. L. Tellier; R. Thornton

1999-11-01T23:59:59.000Z

27

Particle backscatter, extinction, and lidar ratio profiling with Raman lidar in south and north China  

SciTech Connect

Aerosol Raman lidar observations of profiles of the particle extinction and backscatter coefficients and the respective extinction-to-backscatter ratio (lidar ratio) were performed under highly polluted conditions in the Pearl River Delta (PRD) in southern China in October 2004 and at Beijing during a clear period with moderately polluted to background aerosol conditions in January 2005. The anthropogenic haze in the PRD is characterized by volume light-extinction coefficients of particles ranging from approximately 200 to800 Mm-1 and lidar ratios mostly between 40 and 55 sr (average of47{+-}6 sr). Almost clean air masses were observed throughout the measurements of the Beijing campaign. These air masses originated from arid desert-steppe-like regions (greater Gobi area).Extinction values usually varied between 100 and300 Mm-1, and the lidar ratios were considerably lower (compared with PRD values) with values mostly from 30 to 45 sr (average of38{+-}7 sr). Gobi dust partly influenced the observations. Unexpectedly low lidar ratios of approximately 25 sr were found for a case of background aerosol with a low optical depth of 0.05. The low lidar ratios are consistent with Mie-scattering calculations applied to ground-based observations of particle size distributions.

Tesche, Matthias; Ansmann, Albert; Mueller, Detlef; Althausen, Dietrich; Engelmann, Ronny; Hu Min; Zhang Yuanghang

2007-09-01T23:59:59.000Z

28

ARM: 2-minute Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm  

DOE Data Explorer (OSTI)

2-minute Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

29

ARM: 10-minute Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm  

DOE Data Explorer (OSTI)

10-minute Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm

Rob Newsom; John Goldsmith

30

ARM: 10-minute Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm  

DOE Data Explorer (OSTI)

10-minute Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm

Rob Newsom; John Goldsmith

31

ARM: 1-minute Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm  

DOE Data Explorer (OSTI)

1-minute Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

32

ARM: 10-second Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm  

DOE Data Explorer (OSTI)

10-second Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

33

ARM: 1-minute Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm  

DOE Data Explorer (OSTI)

1-minute Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

34

ARM: 10-second Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm  

Science Conference Proceedings (OSTI)

10-second Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

2010-12-15T23:59:59.000Z

35

ARM: 1-minute Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm  

SciTech Connect

1-minute Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

2010-12-15T23:59:59.000Z

36

ARM: 1-minute Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm  

Science Conference Proceedings (OSTI)

1-minute Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

2010-12-15T23:59:59.000Z

37

Boundary-Layer Water Vapor Probing with a Solar-Blind Raman Lidar: Validations, Meteorological Observations and Prospects  

Science Conference Proceedings (OSTI)

The ability of a solar-blind Raman lidar (SBRL) to measure the vertical profile of water vapor in the boundary layer is proved from a theoretical as well as an experimental point of view.

D. Renaut; R. Capitini

1988-10-01T23:59:59.000Z

38

Can Wind Lidars Measure Turbulence?  

Science Conference Proceedings (OSTI)

Modeling of the systematic errors in the second-order moments of wind speeds measured by continuous-wave (ZephIR) and pulsed (WindCube) lidars is presented. These lidars use the conical scanning technique to measure the velocity field. The model ...

A. Sathe; J. Mann; J. Gottschall; M. S. Courtney

2011-07-01T23:59:59.000Z

39

ARM: 10-minute TEMPORARY Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm  

DOE Data Explorer (OSTI)

10-minute TEMPORARY Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

40

ARM: 10-minute TEMPORARY Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm  

DOE Data Explorer (OSTI)

10-minute TEMPORARY Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

ARM: 10-minute TEMPORARY Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm  

SciTech Connect

10-minute TEMPORARY Raman Lidar: aerosol scattering ratio and backscattering coefficient profiles, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

2010-12-15T23:59:59.000Z

42

ARM: 10-minute TEMPORARY Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm  

SciTech Connect

10-minute TEMPORARY Raman Lidar: aerosol extinction profiles and aerosol optical thickness, from first Ferrare algorithm

Chitra Sivaraman; Connor Flynn

2010-12-15T23:59:59.000Z

43

Raman lidar profiling of aerosols over the central U.S.; diurnal  

E-Print Network (OSTI)

We use profiles of aerosol extinction, water vapor mixing ratio, and relative humidity measured by the ARM SGP Raman lidar in northern Oklahoma to show how the vertical distributions of aerosol extinction and water vapor vary throughout the diurnal cycle. While significant (20-30%) variations in aerosol extinction occurred near the surface as well as aloft, smaller (~10%) variations were observed in the diurnal variability of aerosol optical thickness (AOT). The diurnal variations in aerosol extinction profiles are well correlated with corresponding variations in the average relative humidity profiles. The water vapor mixing ratio profiles and integrated water vapor amounts generally show less diurnal variability. The Raman lidar profiles are also used to evaluate the aerosol optical thickness and aerosol extinction profiles simulated by the GOCART global aerosol model. Initial comparisons show that the AOT simulated by GOCART was in closer agreement with the AOT derived from the Raman lidar and Sun photometer measurements during November 2000 than during September 2000. For both months, the vertical variability in average aerosol extinction profiles simulated by GOCART is less than the variability in the corresponding Raman lidar profiles.

Variability And Comparisons; R. A. Ferrare A; M. Chin B; M. Clayton C; D. Turner D

2002-01-01T23:59:59.000Z

44

Structure of an Internal Bore and Dissipating Gravity Current as Revealed by Raman Lidar  

Science Conference Proceedings (OSTI)

Detailed moisture observations from a ground-based Raman lidar and special radiosonde data of two disturbances associated with a dissipating gust front are presented. A synthesis of the lidar data with conventional meteorological data, in ...

Steven E. Koch; Paul B. Dorian; R. Ferrare; S. H. Melfi; William C. Skillman; D. Whiteman

1991-04-01T23:59:59.000Z

45

Raman Lidar Profiling of Tropospheric Water Vapor over Kangerlussuaq, Greenland  

Science Conference Proceedings (OSTI)

A new measurement capability has been implemented in the Arctic Lidar Technology (ARCLITE) system at the Sondrestrom upper-atmosphere research facility near Kangerlussuaq, Greenland (67.0°N, 50.9°W), enabling estimates of atmospheric water vapor ...

Ryan Reynolds Neely III; Jeffrey P. Thayer

2011-09-01T23:59:59.000Z

46

Waterspout Velocity Measurements by Airborne Doppler Lidar  

Science Conference Proceedings (OSTI)

A Doppler lidar measures the line-of-sight velocity of cloud droplets in a waterspout much as a meteorological Doppler radar measures the velocity of larger hydrometeors. We discuss details of the application of an airborne Doppler lidar to ...

R. L. Schwiesow; R. E. Cupp; P. C. Sinclair; R. F. Abbey Jr.

1981-04-01T23:59:59.000Z

47

ARM: 10-minute Raman Lidar: aerosol depolarization profiles and single layer cloud optical depths from first Turner algorithm  

DOE Data Explorer (OSTI)

10-minute Raman Lidar: aerosol depolarization profiles and single layer cloud optical depths from first Turner algorithm

Rob Newsom; John Goldsmith

48

First-Year Operation of a New Water Vapor Raman Lidar at the JPL Table Mountain Facility, California  

Science Conference Proceedings (OSTI)

A new water vapor Raman lidar was recently built at the Table Mountain Facility (TMF) of the Jet Propulsion Laboratory (JPL) in California and more than a year of routine 2-h-long nighttime measurements 4–5 times per week have been completed. The ...

Thierry Leblanc; I. Stuart McDermid; Robin A. Aspey

2008-08-01T23:59:59.000Z

49

Lidar and radiosonde measurement campaign for the validation of ENVISAT atmospheric products  

E-Print Network (OSTI)

An intensive aerosol and water vapour lidar measurement campaign, started on July 2002, is in progress at IMAA in Tito Scalo (PZ) (Southern Italy, 40°36’N, 15°44’E, 820 m above sea level) in the frame of the validation program of ENVISAT. A Raman lidar system is used to perform both aerosol and water vapour measurements; aerosol backscatter and extinction coefficients are retrieved from simultaneous elastic signals at 355 nm and inelastic N2 Raman backscatter lidar signals at 386.6 nm, whereas, water vapour mixing ratio measurements are retrieved from simultaneous H2O and N2 Raman signals. All the observations are complemented with radiosonde launches. First results of the intercomparison between water vapour lidar profiles and MIPAS profiles are presented. Radiosonde measurements of pressure and temperature have been compared with MIPAS and GOMOS profiles.

V. Cuomo; A. Amodeo; C. Cornacchia; L. Mona

2003-01-01T23:59:59.000Z

50

Portable Raman Lidar PollyXT for Automated Profiling of Aerosol Backscatter, Extinction, and Depolarization  

Science Conference Proceedings (OSTI)

Two versions of the portable aerosol Raman lidar system (Polly) are presented. First, the two-channel prototype is depicted. It has been developed for the independent and simultaneous determination of particle backscatter and extinction ...

Dietrich Althausen; Ronny Engelmann; Holger Baars; Birgit Heese; Albert Ansmann; Detlef Müller; Mika Komppula

2009-11-01T23:59:59.000Z

51

Airborne Doppler Lidar Wind Field Measurements  

Science Conference Proceedings (OSTI)

A coherent Doppler lidar has been used in an aircraft to measure the 2-dimensional wind field in a number of different atmospheric situations. The lidar, a pulsed CO2 system, was installed in the NASA Convair 990. Galileo II, and flown in a ...

J. Bilbro; G. Fichtl; D. Fitzjarrald; M. Krause; R. Lee

1984-04-01T23:59:59.000Z

52

Cirrus Cloud Microphysical Property Retrieval Using Lidar and Radar Measurements. Part II: Midlatitude Cirrus Microphysical and Radiative Properties  

Science Conference Proceedings (OSTI)

The lidar–radar algorithm described in Part I of this set of papers is applied to 1000 h of Raman lidar and millimeter wave cloud radar (MMCR) data collected at the Atmospheric Radiation Measurement program Southern Great Plains Clouds and ...

Zhien Wang; Kenneth Sassen

2002-07-01T23:59:59.000Z

53

Turn-key Raman lidar for profiling atmospheric water vapor, clouds, and aerosols at the US Southern Great Plains Climate Study Site  

SciTech Connect

There are clearly identified scientific requirements for continuous profiling of atmospheric water vapor at the Department of Energy, Atmospheric Radiation Measurement program, Southern Great Plains CART (Cloud and Radiation Testbed) site in northern Oklahoma. Research conducted at several laboratories has demonstrated the suitability of Raman lidar for providing measurements that are an excellent match to those requirements. We have developed and installed a ruggedized Raman lidar system that resides permanently at the CART site, and that is computer automated to eliminate the requirements for operator interaction. In addition to the design goal of profiling water vapor through most of the troposphere during nighttime and through the boundary layer during daytime, the lidar provides quantitative characterizations of aerosols and clouds, including depolarization measurements for particle phase studies.

Goldsmith, J.E.M.; Blair, F.H.; Bisson, S.E.

1997-12-31T23:59:59.000Z

54

Nonintrusive Measurement of Ocean Waves: Lidar Wave Gauge  

Science Conference Proceedings (OSTI)

In December 1999, a nonintrusive directional lidar wave gauge (LWG) was field tested at the Field Research Facility (FRF) in North Carolina. The LWG uses proven lidar technology to directly measure water surface elevation from above the water’s ...

Jennifer L. Irish; Jennifer M. Wozencraft; A. Grant Cunningham; Claudine Giroud

2006-11-01T23:59:59.000Z

55

Calibration of a Multichannel Water Vapor Raman Lidar through Noncollocated Operational Soundings: Optimization and Characterization of Accuracy and Variability  

Science Conference Proceedings (OSTI)

This paper presents a parametric automatic procedure to calibrate the multichannel Rayleigh–Mie–Raman lidar at the Institute for Atmospheric Science and Climate of the Italian National Research Council (ISAC-CNR) in Tor Vergata, Rome, Italy, ...

Davide Dionisi; Fernando Congeduti; Gian Luigi Liberti; Francesco Cardillo

2010-01-01T23:59:59.000Z

56

Evolution of the Pinatubo Aerosol: Raman Lidar Observations of Particle Optical Depth, Effective Radius, Mass, and Surface Area over Central Europe at 53.4°N  

Science Conference Proceedings (OSTI)

The Raman lidar technique has been applied to document the evolution and dissipation of the Pinatubo aerosol between 1991 and 1995. For the first time, profiles of the particle extinction coefficient have been determined with lidar in the ...

A. Ansmann; I. Mattis; U. Wandinger; F. Wagner; J. Reichardt; T. Deshler

1997-11-01T23:59:59.000Z

57

Raman Lidar Profiles Best Estimate Value-Added Product Technical Report  

Science Conference Proceedings (OSTI)

The ARM Raman lidars are semi-autonomous ground-based systems that transmit at a wavelength of 355 nm with 300 mJ, {approx}5 ns pulses, and a pulse repetition frequency of 30Hz. Signals from the various detection channels are processed to produce time- and height-resolved estimates of several geophysical quantities, such as water vapor mixing ratio, relative humidity, aerosol scattering ratio, backscatter, optical depth, extinction, and depolarization ratio. Data processing is currently handled by a suite of six value-added product (VAP) processes. Collectively, these processes are known as the Raman Lidar Profiles VAP (RLPROF). The top-level best-estimate (BE) VAP process was introduced in order to bring together the most relevant information from the intermediate-level VAPs. As such, the BE process represents the final stage in data processing for the Raman lidar. Its principal function is to extract the primary variables from each of the intermediate-level VAPs, perform additional quality control, and combine all of this information into a single output file for the end-user. The focus of this document is to describe the processing performed by the BE VAP process.

Newson, R

2012-01-18T23:59:59.000Z

58

Field Measurements of Wind Turbine Wakes with Lidars  

Science Conference Proceedings (OSTI)

Field measurements of the wake flow produced from a 2-MW Enercon E-70 wind turbine were performed using three scanning Doppler wind lidars. A GPS-based technique was used to determine the position of the wind turbine and the wind lidar locations, ...

Giacomo Valerio Iungo; Yu-Ting Wu; Fernando Porté-Agel

2013-02-01T23:59:59.000Z

59

Scopes and Challenges of Dual-Doppler Lidar Wind Measurements—An Error Analysis  

Science Conference Proceedings (OSTI)

Pulsed Doppler lidars are powerful tools for long-range high-resolution measurements of radial wind velocities. With the development of commercial Doppler lidars and the reduction of acquisition costs, dual-Doppler lidar systems will be become ...

Christina Stawiarski; Katja Träumner; Christoph Knigge; Ronald Calhoun

60

Boundary Layer Height and Entrainment Zone Thickness Measured by Lidars and Wind-Profiling Radars  

Science Conference Proceedings (OSTI)

The authors examine measurements of boundary layer height zi and entrainment zone thickness observed with two lidars and with a radar wind profiler during the Flatland96 Lidars in Flat Terrain experiment. Lidar backscatter is proportional to ...

Stephen A. Cohn; Wayne M. Angevine

2000-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Scopes and Challenges of Dual-Doppler Lidar Wind Measurements—An Error Analysis  

Science Conference Proceedings (OSTI)

Pulsed Doppler lidars are powerful tools for long-range, high-resolution measurements of radial wind velocities. With the development of commercial Doppler lidars and the reduction of acquisition costs, dual-Doppler lidar systems will be become ...

Christina Stawiarski; Katja Träumner; Christoph Knigge; Ronald Calhoun

2013-09-01T23:59:59.000Z

62

Four-Dimensional Variational Data Analysis of Water Vapor Raman Lidar Data and Their Impact on Mesoscale Forecasts  

Science Conference Proceedings (OSTI)

The impact of water vapor observations on mesoscale initial fields provided by a triangle of Raman lidar systems covering an area of about 200 km × 200 km is investigated. A test case during the Lindenberg Campaign for Assessment of Humidity and ...

Matthias Grzeschik; Hans-Stefan Bauer; Volker Wulfmeyer; Dirk Engelbart; Ulla Wandinger; Ina Mattis; Dietrich Althausen; Ronny Engelmann; Matthias Tesche; Andrea Riede

2008-08-01T23:59:59.000Z

63

Methodology for Water Monitoring in the Upper Troposphere with Raman Lidar at the Haute-Provence Observatory  

Science Conference Proceedings (OSTI)

A Raman water vapor lidar has been developed at the Haute-Provence Observatory to study the distribution of water in the upper troposphere and its long-term evolution. Some investigations have been proposed and described to ensure a pertinent ...

Christophe Hoareau; Philippe Keckhut; Alain Sarkissian; Jean-Luc Baray; Georges Durry

2009-10-01T23:59:59.000Z

64

Tropospheric Water Vapor Transport as Determined from Airborne Lidar Measurements  

Science Conference Proceedings (OSTI)

The first collocated measurements during THORPEX (The Observing System Research and Predictability Experiment) regional campaign in Europe in 2007 were performed by a novel four-wavelength differential absorption lidar and a scanning 2-?m Doppler ...

Andreas Schäfler; Andreas Dörnbrack; Christoph Kiemle; Stephan Rahm; Martin Wirth

2010-12-01T23:59:59.000Z

65

Platform-Motion Correction of Velocity Measured by Doppler Lidar  

Science Conference Proceedings (OSTI)

The NOAA/Earth System Research Laboratory (ESRL) has two coherent Doppler lidar systems that have been deployed on board research vessels to obtain data during several experiments. The instruments measure the wind velocity relative to the motion ...

Reginald J. Hill; W. Alan Brewer; Sara C. Tucker

2008-08-01T23:59:59.000Z

66

LIDAR Wind Speed Measurements of Evolving Wind Fields  

DOE Green Energy (OSTI)

Light Detection and Ranging (LIDAR) systems are able to measure the speed of incoming wind before it interacts with a wind turbine rotor. These preview wind measurements can be used in feedforward control systems designed to reduce turbine loads. However, the degree to which such preview-based control techniques can reduce loads by reacting to turbulence depends on how accurately the incoming wind field can be measured. Past studies have assumed Taylor's frozen turbulence hypothesis, which implies that turbulence remains unchanged as it advects downwind at the mean wind speed. With Taylor's hypothesis applied, the only source of wind speed measurement error is distortion caused by the LIDAR. This study introduces wind evolution, characterized by the longitudinal coherence of the wind, to LIDAR measurement simulations to create a more realistic measurement model. A simple model of wind evolution is applied to a frozen wind field used in previous studies to investigate the effects of varying the intensity of wind evolution. LIDAR measurements are also evaluated with a large eddy simulation of a stable boundary layer provided by the National Center for Atmospheric Research. Simulation results show the combined effects of LIDAR errors and wind evolution for realistic turbine-mounted LIDAR measurement scenarios.

Simley, E.; Pao, L. Y.

2012-07-01T23:59:59.000Z

67

LIDAR Wind Speed Measurements of Evolving Wind Fields  

SciTech Connect

Light Detection and Ranging (LIDAR) systems are able to measure the speed of incoming wind before it interacts with a wind turbine rotor. These preview wind measurements can be used in feedforward control systems designed to reduce turbine loads. However, the degree to which such preview-based control techniques can reduce loads by reacting to turbulence depends on how accurately the incoming wind field can be measured. Past studies have assumed Taylor's frozen turbulence hypothesis, which implies that turbulence remains unchanged as it advects downwind at the mean wind speed. With Taylor's hypothesis applied, the only source of wind speed measurement error is distortion caused by the LIDAR. This study introduces wind evolution, characterized by the longitudinal coherence of the wind, to LIDAR measurement simulations to create a more realistic measurement model. A simple model of wind evolution is applied to a frozen wind field used in previous studies to investigate the effects of varying the intensity of wind evolution. LIDAR measurements are also evaluated with a large eddy simulation of a stable boundary layer provided by the National Center for Atmospheric Research. Simulation results show the combined effects of LIDAR errors and wind evolution for realistic turbine-mounted LIDAR measurement scenarios.

Simley, E.; Pao, L. Y.

2012-07-01T23:59:59.000Z

68

LIDAR wind speed measurements of evolving wind fields  

E-Print Network (OSTI)

Light Detection and Ranging (LIDAR) systems are able to measure the speed of incoming wind before it interacts with a wind turbine rotor. These preview wind measurements can be used in feedforward control systems designed to reduce turbine loads. However, the degree to which such preview-based control techniques can reduce loads by reacting to turbulence depends on how accurately the incoming wind field can be measured. Past studies have assumed Taylor’s frozen turbulence hypothesis, which implies that turbulence remains unchanged as it advects downwind at the mean wind speed. With Taylor’s hypothesis applied, the only source of wind speed measurement error is distortion caused by the LIDAR. This study introduces wind evolution, characterized by the longitudinal coherence of the wind, to LIDAR measurement simulations to create a more realistic measurement model. A simple model of wind evolution is applied to a frozen wind field used in previous studies to investigate the effects of varying the intensity of wind evolution. Simulation results show the combined effects of LIDAR errors and wind evolution for realistic turbine-mounted LIDAR measurement scenarios. Nomenclature a decay parameter for exponential coherence al decrement parameter for transverse coherence (l ? {u, v, w}) bl offset parameter for transverse coherence (l ? {u, v, w}) D longitudinal distance between two points or measurement preview distance F focal distance f frequency (Hz) ? LIDAR measurement angle off of longitudinal direction k wind velocity wavenumber (m?1) ? wavelength (m) R range along LIDAR beam r scan radius for spinning LIDAR scenario ri,j distance between two points in the yz plane U mean wind speed (m/s) ?i,j average mean wind speed between two points in the yz plane ? azimuth angle in the rotor plane ?2 xy(f) Coherence between signals x and y

Eric Simley; Lucy Y. Pao; Neil Kelley; Bonnie Jonkman; Rod Frehlich

2012-01-01T23:59:59.000Z

69

DOE/SC-ARM/TR-120 Raman Lidar Profiles-Temperature  

NLE Websites -- All DOE Office Websites (Extended Search)

0 0 Raman Lidar Profiles-Temperature (RLPROFTEMP) Value-Added Product RK Newsom C Sivaraman SA McFarlane October 2012 DISCLAIMER This report was prepared as an account of work sponsored by the U.S. Government. Neither the United States nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or

70

On the Quantitative Low-Level Aerosol Measurements Using Ceilometer-Type Lidar  

Science Conference Proceedings (OSTI)

The objective of this work is to investigate whether a commercial ceilometer-type lidar can be used as a quantitative aerosol measurement instrument. To this end, lidar backscattering measurements are compared with exact theoretical calculations ...

Anu-Maija Sundström; Timo Nousiainen; Tuukka Petäjä

2009-11-01T23:59:59.000Z

71

TESTING THE ACCURACY OF LIDAR FOREST MEASUREMENT REPLICATIONS IN OPERATIONAL SETTINGS.  

E-Print Network (OSTI)

??The repeatability of stand measurements derived from LiDAR data was tested in east-central Mississippi. Data collected from LiDAR missions and from ground plots were analyzed… (more)

Arnold, Theresa Faye

2009-01-01T23:59:59.000Z

72

Strategies for Circulation Evaluation of Aircraft Wake Vortices Measured by Lidar  

Science Conference Proceedings (OSTI)

An assessment of different methods for circulation evaluation from lidar measurement data of aircraft wake vortices is performed. The surface integral of vorticity serves as baseline case that is compared to a method that evaluates the lidar line-...

Frank Holzäpfel; Thomas Gerz; Friedrich Köpp; Eike Stumpf; Michael Harris; Robert I. Young; Agnès Dolfi-Bouteyre

2003-08-01T23:59:59.000Z

73

Using Horizontal and Slant Lidar Measurements to Obtain Calibrated Aerosol Scattering Coefficients from a Coastal Lidar in Hawaii  

Science Conference Proceedings (OSTI)

Sea salt aerosol concentrations in the clean marine boundary layer can be considered spatially homogeneous when averaged over space and time. Using this assumption, horizontal and slant lidar measurements are carried out at a Hawaii coastal site ...

J. N. Porter; B. Lienert; Shiv K. Sharma

2000-11-01T23:59:59.000Z

74

LIDAR Wind Speed Measurements of Evolving Wind Fields  

Science Conference Proceedings (OSTI)

Light Detection and Ranging (LIDAR) systems are able to measure the speed of incoming wind before it interacts with a wind turbine rotor. These preview wind measurements can be used in feedforward control systems that are designed to reduce turbine loads. However, the degree to which such preview-based control techniques can reduce loads by reacting to turbulence depends on how accurately the incoming wind field can be measured. Past studies have assumed the validity of physicist G.I. Taylor's 1938 frozen turbulence hypothesis, which implies that turbulence remains unchanged as it advects downwind at the mean wind speed. With Taylor's hypothesis applied, the only source of wind speed measurement error is distortion caused by the LIDAR. This study introduces wind evolution, characterized by the longitudinal coherence of the wind, to LIDAR measurement simulations using the National Renewable Energy Laboratory's (NREL's) 5-megawatt turbine model to create a more realistic measurement model. A simple model of wind evolution was applied to a frozen wind field that was used in previous studies to investigate the effects of varying the intensity of wind evolution. LIDAR measurements were also evaluated using a large eddy simulation (LES) of a stable boundary layer that was provided by the National Center for Atmospheric Research. The LIDAR measurement scenario investigated consists of a hub-mounted LIDAR that scans a circle of points upwind of the turbine in order to estimate the wind speed component in the mean wind direction. Different combinations of the preview distance that is located upwind of the rotor and the radius of the scan circle were analyzed. It was found that the dominant source of measurement error for short preview distances is the detection of transverse and vertical wind speeds from the line-of-sight LIDAR measurement. It was discovered in previous studies that, in the absence of wind evolution, the dominant source of error for large preview distances is the spatial averaging caused by the LIDAR's sampling volume. However, by introducing wind evolution, the dominant source of error for large preview distances was found to be the coherence loss caused by evolving turbulence. Different measurement geometries were compared using the bandwidth for which the measurement coherence remained above 0.5 and also the area under the measurement coherence curve. Results showed that, by increasing the intensity of wind evolution, the measurement coherence decreases. Using the coherence bandwidth metric, the optimal preview distance for a fixed-scan radius remained almost constant for low and moderate amounts of wind evolution. For the wind field with the simple wind evolution model introduced, the optimal preview distance for a scan radius of 75% blade span (47.25 meters) was found to be 80 meters. Using the LES wind field, the optimal preview distance was 65 meters. When comparing scan geometries using the area under the coherence curve, results showed that, as the intensity of wind evolution increases, the optimal preview distance decreases.

Simley, E.; Pao, L. Y.; Kelley, N.; Jonkman, B.; Frehlich, R.

2012-01-01T23:59:59.000Z

75

DOE/SC-ARM/TR-100 Raman Lidar Profiles Best Estimate Value-Added Product Technical Report  

NLE Websites -- All DOE Office Websites (Extended Search)

0 0 Raman Lidar Profiles Best Estimate Value-Added Product Technical Report R Newsom January 2012 DISCLAIMER This report was prepared as an account of work sponsored by the U.S. Government. Neither the United States nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. The views and

76

A Comparison of Vertical Velocity in Cirrus Obtained from Aircraft and Lidar Divergence Measurements during FIRE  

Science Conference Proceedings (OSTI)

Techniques are presented to obtain vertical velocity in cirrus clouds from in situ aircraft lateral wind measurements and from ground-based remote Doppler lidar measurements. In general, direct measurements of absolute vertical velocity w from ...

I. Gultepe; A. J. Heymsfield; D. H. Lenschow

1990-02-01T23:59:59.000Z

77

Lidar Measurement of Turbulence Encountered by Horizontal-Axis Wind Turbines  

Science Conference Proceedings (OSTI)

We used a continuous-wave (CW) Doppler lidar to measure wind velocity turbulence from a moving frame of reference. By directing the lidar beam to trace the perimeters of vertical-plane disks about horizontal axes parallel to the mean wind ...

R. M. Hardesty; B. F. Weber

1987-03-01T23:59:59.000Z

78

Slant-Lidar Aerosol Extinction Measurements and their Relation to Measured and Calculated Albedo Changes  

Science Conference Proceedings (OSTI)

The slant-path (or zenith-angle scanning) lidar technique is used to measure boundary-layer optical depths for ten different times during a single day. For the range of optical depths encountered (0.03–0.14 at 0.69 ?m wavelength), 1? measurement ...

Philip B. Russell; John M. Livingston

1984-08-01T23:59:59.000Z

79

Assimilating Coherent Doppler Lidar Measurements into a Model of the Atmospheric Boundary Layer. Part II: Sensitivity Analyses  

Science Conference Proceedings (OSTI)

A series of trials are performed to evaluate the sensitivity of a 4DVAR algorithm for retrieval of microscale wind and temperature fields from single-Doppler lidar data. These trials use actual Doppler lidar measurements to examine the ...

Rob K. Newsom; Robert M. Banta

2004-12-01T23:59:59.000Z

80

Cirrus Cloud Microphysical Property Retrieval Using Lidar and Radar Measurements. Part I: Algorithm Description and Comparison with In Situ Data  

Science Conference Proceedings (OSTI)

A retrieval algorithm is described to estimate vertical profiles of cirrus-cloud ice water content (IWC) and general effective size Dge from combined lidar and radar measurements. In the algorithm, the lidar extinction coefficient ? is ...

Zhien Wang; Kenneth Sassen

2002-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Measuring forest canopy height using a combination of lidar and aerial photography data  

E-Print Network (OSTI)

It has been demonstrated that the height of forest canopies can be measured with a good accuracy using small footprint lidars. This is essentially accomplished by subtracting the last return altitude (ground) from the corresponding first return altitude (canopy surface). The technique is considered superior to photogrammetric methods mainly because the ground level, which is difficult to see on aerial photos of densely forested areas, can be well identified using small footprint lidars. However, lidar cannot be used to characterized past forest states, while these can be assessed, and photogrammetically measured, in the wealth of historical aerial photographs most developed countries possess. Our goal is to replace the first return lidar data by altitude models derived from aerial photos in order to map forest canopy height changes of the past decades. This paper presents the first methodological steps which consist in comparing canopy heights obtained from lidar data only to a combination of lidar and photogrammetry data. The lidar data was acquired over an area of the boreal forest in Quebec, Canada, in 1998, using Optech’s ALTM1020 flying at an altitude of 700 m. Two stereo-pairs of aerial black and white photographs were used: 1) a pair of 1:15,000 photos taken in 1994, and 2) a pair of 1:40,000 photos taken in 1998. A lidar canopy height model (CHM) was created by subtracting ground altitudes from canopy altitudes. Aerial photo altitude models were derived using the image correlation methods of Virtuozo 3.2 software. The ground level altitudinal fit between the aerial photo altitude model and the lidar data was checked on rock outcrops. A photo CHM was created by subtracting the lidar ground altitude model from the aerial photo altitude model. The photo CHM and the lidar CHM show a good degree of correlation.

Benoît A. St-onge; Nora Achaichia

2001-01-01T23:59:59.000Z

82

Statistics of Cloud Optical Properties from Airborne Lidar Measurements  

Science Conference Proceedings (OSTI)

Accurate knowledge of cloud optical properties, such as extinction-to-backscatter ratio and depolarization ratio, can have a significant impact on the quality of cloud extinction retrievals from lidar systems because parameterizations of these ...

John E. Yorks; Dennis L. Hlavka; William D. Hart; Matthew J. McGill

2011-07-01T23:59:59.000Z

83

Chirp-Induced Bias in Velocity Measurements by a Coherent Doppler CO2 Lidar  

Science Conference Proceedings (OSTI)

Radial wind velocity measurements by a pulsed CO2 Doppler lidar may be biased even in stationary atmospheric conditions. The authors show it is due to random speckle fluctuations of the backscattered signal and is related to the dissymmetry of ...

Alain M. Dabas; Philippe Drobinski; Pierre H. Flamant

1998-04-01T23:59:59.000Z

84

Retrieval of Cirrus Cloud Radiative and Backscattering Properties Using Combined Lidar and Infrared Radiometer (LIRAD) Measurements  

Science Conference Proceedings (OSTI)

A method for retrieval of cirrus macrophysical and radiative properties using combined ruby lidar and infrared radiometer measurements is explained in detail. The retrieval algorithm includes estimation of a variable backscatter-to-extinction ...

Jennifer M. Comstock; Kenneth Sassen

2001-10-01T23:59:59.000Z

85

Pressure Measurements Using an Airborne Differential Absorption Lidar. Part I: Analysis of the Systematic Error Sources  

Science Conference Proceedings (OSTI)

Systematic error sources that require correction when making remote airborne measurements of the atmospheric pressure field in the lower troposphere, using an oxygen differential absorption lidar, are analyzed. A detailed analysis of this ...

Cyrille N. Flamant; Geary K. Schwemmer; C. Laurence Korb; Keith D. Evans; Stephen P. Palm

1999-05-01T23:59:59.000Z

86

Lidar Measurement of Ammonia Concentrations and Fluxes in a Plume from a Point Source  

Science Conference Proceedings (OSTI)

A field experiment was performed that demonstrated the ability of a scanning carbon dioxide (CO2) coherent lidar system to measure the concentration distribution of ammonia in a plume from a point source. This application of the differential ...

Yanzeng Zhao; W. Alan Brewer; Wynn L. Eberhard; Raul J. Alvarez

2002-12-01T23:59:59.000Z

87

Recent Lidar Technology Developments and Their Influence on Measurements of Tropospheric Water Vapor  

Science Conference Proceedings (OSTI)

In this paper the influences of recent technology developments in the areas of lasers, detectors, and optical filters of a differential absorption lidar (DIAL) system on the measurement of tropospheric water vapor (H20) profiles are discussed. ...

Syed Ismail; Edward V. Browell

1994-02-01T23:59:59.000Z

88

Cluster Analysis: A new approach applied to Lidar measurements for Atmospheric Boundary Layer height estimation  

Science Conference Proceedings (OSTI)

Several procedures are widely applied to estimate the Atmospheric Boundary Layer (ABL) top height by using aerosols as tracers from lidar measurements. These methods represent different mathematical approaches relying on either the abrupt step of ...

Daniel Toledo; Carmen Córdoba-Jabonero; Manuel Gil-Ojeda

89

Influence of Humidified Aerosol on Lidar Depolarization Measurements below Ice-Precipitating Arctic Stratus  

Science Conference Proceedings (OSTI)

Lidar measurements obtained during the Surface Heat Budget of the Arctic Ocean (SHEBA) experiment under a mixed-phase stratus cloud that was lightly precipitating ice show a range of surprisingly low depolarization ratios (4%–23%), despite an ...

Bastiaan van Diedenhoven; Ann M. Fridlind; Andrew S. Ackerman

2011-10-01T23:59:59.000Z

90

Analysis of Wind Speed Measurements using Continuous Wave LIDAR for Wind Turbine Control ?†  

E-Print Network (OSTI)

Light Detection and Ranging (LIDAR) systems are able to measure the speed of incoming wind before it interacts with a wind turbine rotor. These preview wind measurements can be used in feedforward control systems designed to reduce turbine loads. However, the degree to which such preview-based control techniques can reduce loads by reacting to turbulence depends on how accurate the incoming wind field can be measured. This study examines the accuracy of different measurement scenarios that rely on coherent continuouswave Doppler LIDAR systems to determine their applicability to feedforward control. In particular, the impacts of measurement range and angular offset from the wind direction are studied for various wind conditions. A realistic case involving a scanning LIDAR unit mounted in the spinner of a wind turbine is studied in depth, with emphasis on choices for scan radius and preview distance. The effects of turbulence parameters on measurement accuracy are studied as well. Nomenclature d measurement preview distance F focal distance k wind velocity wavenumber (m?1) r scan radius for spinning LIDAR RMS root mean square ?u standard deviation of u component of wind velocity TI turbulence intensity ? LIDAR measurement angle ? mean u wind speed u ? friction velocity U ? D average friction velocity over rotor disk ? angle between laser and wind velocity vector ? angle in the rotor plane ? rotational rate of spinning LIDAR

Eric Simley; Lucy Y. Pao; Rod Frehlich; Bonnie Jonkman; Neil Kelley

2011-01-01T23:59:59.000Z

91

Lidar measurement of wind velocity turbulence spectra encountered by a rotating turbine blade  

DOE Green Energy (OSTI)

A homodyne CO/sub 2/ lidar system beam was conically scanned around a horizontal axis to measure the wind speed and turbulence characteristics encountered by a rotating turbine blade. Turbulence spectra obtained from the scanning lidar differed considerably from those calculated from fixed-point anemometer measurements, showing a redistribution of energy from lower to higher frequencies. The differences appeared more pronounced during periods when the atmosphere was stable.

Hardesty, R.M.; Korrell, J.A.; Hall, F.F. Jr.

1982-01-01T23:59:59.000Z

92

Modeling Plot-Level Biomass and Volume Using Airborne and Terrestrial Lidar Measurements  

E-Print Network (OSTI)

The United States Forest Service (USFS) Forest Inventory and Analysis (FIA) program provides a diverse selection of data used to assess the status of the nation’s forested areas using sample locations dispersed throughout the country. Airborne, and more recently, terrestrial lidar (light detection and ranging) systems are capable of producing accurate measurements of individual tree dimensions and also possess the ability to characterize three-dimensional vertical forest structure. This study investigates the potential of airborne and terrestrial scanning lidar systems for modeling forest volume and aboveground biomass on FIA subplots in the Malheur National Forest, eastern Oregon. A methodology for the creation of five airborne lidar metric sets (four point cloud-based and one individual tree based) and four terrestrial lidar metric sets (three height-based and one distance-based) is presented. Metrics were compared to estimates of subplot aboveground biomass and gross volume derived from FIA data using national and regional allometric equations respectively. Simple linear regression models from the airborne lidar data accounted for 15 percent of the variability in subplot biomass and 14 percent of the variability in subplot volume, while multiple linear regression models increased these amounts to 29 percent and 25 percent, respectively. When subplot estimates of biophysical parameters were scaled to the plot-level and compared with plot-level lidar metrics, simple linear regression models were able to account for 60 percent of the variability in biomass and 71 percent of the variation in volume. Terrestrial lidar metrics produced moderate results with simple linear regression models accounting for 41 percent of the variability in biomass and 46 percent of the variability in volume, with multiple linear regression models accounting for 71 percent and 84 percent, respectively. Results show that: (1) larger plot sizes help to mitigate errors and produce better models; and (2) a combination of height-based and distance-based terrestrial lidar metrics has the potential to estimate biomass and volume on FIA subplots.

Sheridan, Ryan D.

2011-05-01T23:59:59.000Z

93

Development of coherent Raman measurements of temperature in condensed phases  

SciTech Connect

We report theoretical considerations and preliminary data on various forms of coherent Raman spectroscopy that have been considered as candidates for measurement of temperature in condensed phase experiments with picosecond time resolution. Due to the inherent broadness and congestion of vibrational features in condensed phase solids, particularly at high temperatures and pressures, only approaches that rely on the ratio of anti-Stokes to Stokes spectral features are considered. Methods that rely on resolution of vibrational progressions, calibration of frequency shifts with temperature and pressure in reference experiments, or detailed comparison to calculation are inappropriate or impossible for our applications. In particular, we consider femtosecond stimulated Raman spectroscopy (FSRS), femtosecond/picosecond hybrid coherent Raman spectroscopy (multiplex CARS), and optical heterodyne detected femtosecond Raman induced Kerr Effect spectroscopy (OHD-FRIKES). We show that only FSRS has the ability to measure temperature via an anti-Stokes to Stokes ratio of peaks.

Mcgrane, Shawn D [Los Alamos National Laboratory; Dang, Nhan C [Los Alamos National Laboratory; Bolme, Cindy A [Los Alamos National Laboratory; Moore, David S [Los Alamos National Laboratory

2010-12-08T23:59:59.000Z

94

Performance of a 2-µm Coherent Doppler Lidar for Wind Measurements  

Science Conference Proceedings (OSTI)

Measurements of boundary layer winds are presented using a 2-µm coherent Doppler lidar and the optimal performance of the maximum likelihood estimator. The systematic error for single-shot estimates was estimated as 3.6 cm s?1 using measurements ...

Rod Frehlich; Stephen M. Hannon; Sammy W. Henderson

1994-12-01T23:59:59.000Z

95

Water Vapor Flux Measurements from Ground-Based Vertically Pointed Water Vapor Differential Absorption and Doppler Lidars  

Science Conference Proceedings (OSTI)

For the first time, two lidar systems were used to measure the vertical water vapor flux in a convective boundary layer by means of eddy correlation. This was achieved by combining a water vapor differential absorption lidar and a heterodyne wind ...

Andreas Giez; Gerhard Ehret; Ronald L. Schwiesow; Kenneth J. Davis; Donald H. Lenschow

1999-02-01T23:59:59.000Z

96

A LIDAR-based crop height measurement system for Miscanthus giganteus  

Science Conference Proceedings (OSTI)

The objective of this research was to develop a stem height measurement system for Miscanthus giganteus (MxG), to be used as a component in a future Look Ahead Yield Monitor (LAYM). For this purpose, a SICK(R) LMS 291 LIght Detection And Ranging (LIDAR) ... Keywords: Crop height, Crop sensor, Energy crop, Laser scanner, Plant phenotype, Yield monitor

Lei Zhang; Tony E. Grift

2012-07-01T23:59:59.000Z

97

Statistical Analysis of Sodium Doppler Wind–Temperature Lidar Measurements of Vertical Heat Flux  

Science Conference Proceedings (OSTI)

A statistical study is presented of the errors in sodium Doppler lidar measurements of wind and temperature in the mesosphere that arise from the statistics of the photon-counting process that is inherent in the technique. The authors use data ...

Liguo Su; Richard L. Collins; David A. Krueger; Chiao-Yao She

2008-03-01T23:59:59.000Z

98

A Small Portable Mie–Rayleigh Lidar System to Measure Aerosol Optical and Spatial Properties  

Science Conference Proceedings (OSTI)

The characteristics of a small, lightweight portable lidar system for measuring aerosol (Mie) scatter at wavelengths of 1064 and 532 nm are described. It uses a 20-Hz Nd:YAG pulsed laser as a source and a 12.7-cm-diameter telescope as a receiver. ...

J. N. Porter; B. R. Lienert; S. K. Sharma; H. W. Hubble

2002-11-01T23:59:59.000Z

99

Diffusion in the Lower Stratosphere as Determined from Lidar Measurements of Volcanic Aerosol Dispersion  

Science Conference Proceedings (OSTI)

Lidar measurements of the stratospheric aerosol layer from the Fuego volcanic eruption in 1974 are analyzed to yield estimates of effective vertical mixing coefficients Kz. The data at 19°N latitude give Kz=6.6×102 cm2 s?1 for the altitude range ...

Ellis E. Remsperg

1980-09-01T23:59:59.000Z

100

Performance and Technique of Coherent 2-?m Differential Absorption and Wind Lidar for Wind Measurement  

Science Conference Proceedings (OSTI)

A coherent 2-?m differential absorption and wind lidar (Co2DiaWiL) has been built with a high-power Q-switched Tm,Hm:YLF laser to measure CO2 concentration and radial wind speed. The performance of the Co2DiaWiL is described and analyzed, with a ...

Hironori Iwai; Shoken Ishii; Ryoko Oda; Kohei Mizutani; Shinya Sekizawa; Yasuhiro Murayama

2013-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Upstream Measurements of Wind Profiles with Doppler Lidar for Improved Wind Energy Integration  

DOE Green Energy (OSTI)

New upstream measurements of wind profiles over the altitude range of wind turbines will be produced using a scanning Doppler lidar. These long range high quality measurements will provide improved wind power forecasts for wind energy integration into the power grid. The main goal of the project is to develop the optimal Doppler lidar operating parameters and data processing algorithms for improved wind energy integration by enhancing the wind power forecasts in the 30 to 60 minute time frame, especially for the large wind power ramps. Currently, there is very little upstream data at large wind farms, especially accurate wind profiles over the full height of the turbine blades. The potential of scanning Doppler lidar will be determined by rigorous computer modeling and evaluation of actual Doppler lidar data from the WindTracer system produced by Lockheed Martin Coherent Technologies, Inc. of Louisville, Colorado. Various data products will be investigated for input into numerical weather prediction models and statistically based nowcasting algorithms. Successful implementation of the proposed research will provide the required information for a full cost benefit analysis of the improved forecasts of wind power for energy integration as well as the added benefit of high quality wind and turbulence information for optimal control of the wind turbines at large wind farms.

Rodney Frehlich

2012-10-30T23:59:59.000Z

102

Intercomparison of Water Vapor Data Measured with Lidar during IHOP_2002. Part I: Airborne to Ground-Based Lidar Systems and Comparisons with Chilled-Mirror Hygrometer Radiosondes  

Science Conference Proceedings (OSTI)

The water vapor data measured with airborne and ground-based lidar systems during the International H2O Project (IHOP_2002), which took place in the Southern Great Plains during 13 May–25 June 2002 were investigated. So far, the data collected ...

Andreas Behrendt; Volker Wulfmeyer; Hans-Stefan Bauer; Thorsten Schaberl; Paolo Di Girolamo; Donato Summa; Christoph Kiemle; Gerhard Ehret; David N. Whiteman; Belay B. Demoz; Edward V. Browell; Syed Ismail; Richard Ferrare; Susan Kooi; Junhong Wang

2007-01-01T23:59:59.000Z

103

A Progressive Morphological Filter for Removing Nonground Measurements from Airborne LIDAR Data  

E-Print Network (OSTI)

Recent advances in airborne light detection and ranging (LIDAR) technology allow rapid and inexpensive measurements of topography over large areas. This technology is becoming a primary method for generating high-resolution digital terrain models (DTMs) that are essential to numerous applications such as flood modeling and landslide prediction. Airborne LIDAR systems usually return a three-dimensional cloud of point measurements from reflective objects scanned by the laser beneath the flight path. In order to generate a DTM, measurements from nonground features such as buildings, vehicles, and vegetation have to be classified and removed. In this paper, a progressive morphological filter was developed to detect nongroundLIDARmeasurements.By gradually increasingthe window size of the filter andusing elevation difference thresholds, themeasurements of vehicles, vegetation, and buildings are removed, while ground data are preserved. Datasets from mountainous and flat urbanized areas were selected to test the progressive morphological filter. The results show that the filter can remove most of the nonground points effectively.

Keqi Zhang; Shu-ching Chen; Dean Whitman; Mei-ling Shyu; Jianhua Yan; Chengcui Zhang; Student Member

2003-01-01T23:59:59.000Z

104

Remote Determination of Winds, Turbulence Spectra and Energy Dissipation Rates in the Boundary Layer from Lidar Measurements  

Science Conference Proceedings (OSTI)

Procedures are described for the analysis of lidar data to remotely measure 1) spectra of aerosol density fluctuations, 2) radial and transverse components of the mean wind and turbulent fluctuations of the transverse component of the wind ...

K. E. Kunkel; E. W. Eloranta; J. A. Weinman

1980-05-01T23:59:59.000Z

105

Intercomparison of Wind Measurements from Two Acoustic Doppler Sodars, a Laser Doppler Lidar, and In Situ Sensors  

Science Conference Proceedings (OSTI)

Intercomparative measurements of wind speed, wind direction, wind direction standard deviation, and vertical wind standard deviation from two acoustic Doppler sodars and a laser Doppler lidar are studied, using the BAO tower to provide reference ...

Prasan Chintawongvanich; Robert Olsen; Christopher A. Biltoft

1989-10-01T23:59:59.000Z

106

Airborne Doppler Lidar Measurements of Valley Flows in Complex Coastal Terrain  

Science Conference Proceedings (OSTI)

Three-dimensional winds obtained with an airborne Doppler lidar are used to investigate the spatial structure of topographically driven flows in complex coastal terrain in Southern California. The airborne Doppler lidar collected four hours of ...

S. F. J. De Wekker; K. S. Godwin; G. D. Emmitt; S. Greco

2012-08-01T23:59:59.000Z

107

Lidar Measurements of Wind in the Planetary Boundary Layer: The Method, Accuracy and Results from Joint Measurements with Radiosonde and Kytoon  

Science Conference Proceedings (OSTI)

During the Central Illinois Rainfall Chemistry Experiment (CIRCE), the University of Wisconsin lidar measured wind and turbulence profiles through the planetary boundary layer for a 32-h period in conjunction with surface observations, radiosonde ...

William P. Hooper; Edwin W. Eloranta

1986-07-01T23:59:59.000Z

108

A Comparison of Lidar and Balloon-Borne Particle Counter Measurements of the Stratospheric Aerosol 1974–1980  

Science Conference Proceedings (OSTI)

We compare a series of 85 dustsonde measurements and 84 lidar measurements made in midlatitude North America during 1974–80. This period includes two major volcanic increases (Fuego in 1974 and St. Helens in 1980), as well as an unusually clean, ...

T. J. Swissler; P. Hamill; M. Osborn; P. B. Russell; M. P. McCormick

1982-04-01T23:59:59.000Z

109

Comparing Pulsed Doppler LIDAR with SODAR and Direct Measurements for Wind Assessment  

DOE Green Energy (OSTI)

There is a pressing need for good wind-speed measurements at greater and greater heights to assess the availability of the resource in terms of power production and to identify any frequently occurring atmospheric structural characteristics that may create turbulence that impacts the operational reliability and lifetime of wind turbines and their components. In this paper, we summarize the results of a short study that compares the relative accuracies of wind speeds derived from a high-resolution pulsed Doppler LIDAR operated by the National Oceanic and Atmospheric Administration (NOAA) and a midrange Doppler SODAR with wind speeds measured by four levels of tower-based sonic anemometry up to a height of 116 m.

Kelley, N. D.; Jonkman, B. J.; Scott, G. N.; Pichugina, Y. L.

2007-07-01T23:59:59.000Z

110

Lidar-Measured Winds from Space: A Key Component for Weather and Climate Prediction  

Science Conference Proceedings (OSTI)

The deployment of a space-based Doppler lidar would provide information that is fundamental to advancing the understanding and prediction of weather and climate.

Wayman E. Baker; George D. Emmitt; Franklin Robertson; Robert M. Atlas; John E. Molinari; David A. Bowdle; Jan Paegle; R. Michael Hardesty; Madison J. Post; Robert T. Menzies; T. N. Krishnamurti; Robert A. Brown; John R. Anderson; Andrew C. Lorenc; James McElroy

1995-06-01T23:59:59.000Z

111

Vertical 2-?m Heterodyne Differential Absorption Lidar Measurements of Mean CO2 Mixing Ratio in the Troposphere  

Science Conference Proceedings (OSTI)

Vertical mean CO2 mixing ratio measurements are reported in the atmospheric boundary layer (ABL) and in the lower free troposphere (FT), using a 2-?m heterodyne differential absorption lidar (HDIAL). The mean CO2 mixing ratio in the ABL is ...

Fabien Gibert; Pierre H. Flamant; Juan Cuesta; Didier Bruneau

2008-09-01T23:59:59.000Z

112

Comparisons between Mesoscale Model Terrain Sensitivity Studies and Doppler Lidar Measurements of the Sea Breeze at Monterey Bay  

Science Conference Proceedings (OSTI)

A NOAA/Environmental Technology Laboratory Doppler lidar measured the life cycle of the land- and sea-breeze system at Monterey Bay, California, in 1987, during the Land–Sea Breeze Experiment (LASBEX). On days with offshore synoptic flow, the ...

Lisa S. Darby; Robert M. Banta; Roger A. Pielke Sr.

2002-12-01T23:59:59.000Z

113

Wake Measurements of a Multi-MW Wind Turbine with Coherent Long-Range Pulsed Doppler Wind Lidar  

Science Conference Proceedings (OSTI)

Long-range Doppler wind light detection and ranging (lidar) measurements at a wind turbine were carried out for the first time. The turbine was of the type Areva M5000 and is located at a site near the coastline in Bremerhaven, in the northern ...

Yvonne Käsler; Stephan Rahm; Rudolf Simmet; Martin Kühn

2010-09-01T23:59:59.000Z

114

IR differential-absorption lidars for ecological monitoring of the environment  

Science Conference Proceedings (OSTI)

A review of studies on lidar sensing of the environment by the method of IR differential absorption is presented. The differential-absorption method is described and its various applications are considered. A comparison of this method with other methods of lidar sensing showed that a differential-absorption lidar successfully supplements a Raman lidar. The basic parameters are presented for IR lidars fabricated recently by various research groups. The outlook for the IR lidar sensing of the atmosphere is discussed. (review)

Vasil'ev, B I [P.N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation); Mannoun, Oussama [Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow Region (Russian Federation)

2006-09-30T23:59:59.000Z

115

DIAL Tropospheric Ozone Measurement Using a Nd:YAG Laser and the Raman Shifting Technique  

Science Conference Proceedings (OSTI)

The Differential Absorption Lidar (DIAL) offers a way to perform ozone measurements in the troposphere with the spatial and temporal resolutions needed for both short and long term studies. Only a few DIAL system have been used up to now for this ...

G. Ancellet; A. Papayannis; J. Pelon; G. Mégie

1989-10-01T23:59:59.000Z

116

Virtual Doppler Lidar Instrument  

Science Conference Proceedings (OSTI)

Doppler lidars measure the range-resolved line-of-sight wind component by extracting the Doppler shift of radiation backscattered from atmospheric aerosols and molecules. A virtual instrument was developed to simulate wind measurements by flying ...

Ines Leike; Jürgen Streicher; Christian Werner; Viktor Banakh; Igor Smalikho; Werner Wergen; Alexander Cress

2001-09-01T23:59:59.000Z

117

Can CO2 Turbulent Flux Be Measured by Lidar? A Preliminary Study  

Science Conference Proceedings (OSTI)

The vertical profiling of CO2 turbulent fluxes in the atmospheric boundary layer (ABL) is investigated using a coherent differential absorption lidar (CDIAL) operated nearby a tall tower in Wisconsin during June 2007. A CDIAL can perform ...

Fabien Gibert; Grady J. Koch; Jeffrey Y. Beyon; Timothy W. Hilton; Kenneth J. Davis; Arlyn Andrews; Pierre H. Flamant; Upendra N. Singh

2011-03-01T23:59:59.000Z

118

Remote Measurement of Turbulent Wind Spectra by Heterodyne DopplerLidar Technique  

Science Conference Proceedings (OSTI)

Heterodyne Doppler lidars (HDLs) are used to monitor atmospheric wind field and wind turbulence at remote distance. This last application calls for the derivation of wind spectra, which can be characterized by the dissipation rate and the ?-...

Philippe Drobinski; Alain M. Dabas; Pierre H. Flamant

2000-12-01T23:59:59.000Z

119

Doppler Lidar Measurements of Turbulent Structure Function over an Urban Area  

Science Conference Proceedings (OSTI)

Analysis of radial wind velocity data from the Salford pulsed Doppler infrared lidar is used to calculate turbulent spectral statistics over the city of Salford in the United Kingdom. The results presented here, first, outline the error ...

F. Davies; C. G. Collier; G. N. Pearson; K. E. Bozier

2004-05-01T23:59:59.000Z

120

Volume Scanning Strategies for 3D Wind Retrieval from Dual-Doppler Lidar Measurements  

Science Conference Proceedings (OSTI)

Dual-Doppler lidar volume scans for 3D wind retrieval must accommodate the conflicting goals of dense spatial coverage and short scan duration. In this work, various scanning strategies are evaluated with semisynthetic wind fields from analytical ...

Susanne Drechsel; Georg J. Mayr; Michel Chong; Fotini K. Chow

2010-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

The Ability of MM5 to Simulate Ice Clouds: Systematic Comparison between Simulated and Measured Fluxes and Lidar/Radar Profiles at the SIRTA Atmospheric Observatory  

Science Conference Proceedings (OSTI)

The ability of the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5) to simulate midlatitude ice clouds is evaluated. Model outputs are compared to long-term meteorological measurements by active (radar and lidar) and ...

M. Chiriaco; R. Vautard; H. Chepfer; M. Haeffelin; J. Dudhia; Y. Wanherdrick; Y. Morille; A. Protat

2006-03-01T23:59:59.000Z

122

An Evaluation of Mesoscale Model Predictions of Down-Valley and Canyon Flows and Their Consequences Using Doppler Lidar Measurements during VTMX 2000  

Science Conference Proceedings (OSTI)

A mesoscale model, a Lagrangian particle dispersion model, and extensive Doppler lidar wind measurements during the Vertical Transport and Mixing (VTMX) 2000 field campaign were used to examine converging flows over the Salt Lake valley in Utah ...

Jerome D. Fast; Lisa S. Darby

2004-04-01T23:59:59.000Z

123

A Method for Estimating the Turbulent Kinetic Energy Dissipation Rate from a Vertically Pointing Doppler Lidar, and Independent Evaluation from Balloon-Borne In Situ Measurements  

Science Conference Proceedings (OSTI)

A method of estimating dissipation rates from a vertically pointing Doppler lidar with high temporal and spatial resolution has been evaluated by comparison with independent measurements derived from a balloon-borne sonic anemometer. This method ...

Ewan J. O’Connor; Anthony J. Illingworth; Ian M. Brooks; Christopher D. Westbrook; Robin J. Hogan; Fay Davies; Barbara J. Brooks

2010-10-01T23:59:59.000Z

124

Demonstration of Aerosol Property Profiling by Multiwavelength Lidar under Varying Relative Humidity Conditions  

Science Conference Proceedings (OSTI)

The feasibility of using a multiwavelength Mie–Raman lidar based on a tripled Nd:YAG laser for profiling aerosol physical parameters in the planetary boundary layer (PBL) under varying conditions of relative humidity (RH) is studied. The lidar ...

I. Veselovskii; D. N. Whiteman; A. Kolgotin; E. Andrews; M. Korenskii

2009-08-01T23:59:59.000Z

125

Analysis of lidar depolarization calibration procedure and application to the atmospheric aerosol characterization  

Science Conference Proceedings (OSTI)

A Raman lidar system is used to monitor the aerosol depolarization features of the urban atmosphere at the Andalusian Centre for Environmental Research CEAMA, in Granada, southeastern Spain. The lidar system was upgraded in 2010 to enable the application ...

Juan Antonio Bravo-Aranda; Francisco Navas-Guzmán; Juan Luis Guerrero-Rascado; Daniel Pérez-Ramírez; María José Granados-Muñoz; Lucas Alados-Arboledas

2013-05-01T23:59:59.000Z

126

Lidar Report  

Science Conference Proceedings (OSTI)

This report provides an overview of the LiDAR acquisition methodology employed by Woolpert on the 2009 USDA - Savannah River LiDAR Site Project. LiDAR system parameters and flight and equipment information is also included. The LiDAR data acquisition was executed in ten sessions from February 21 through final reflights on March 2, 2009; using two Leica ALS50-II 150kHz Multi-pulse enabled LiDAR Systems. Specific details about the ALS50-II systems are included in Section 4 of this report.

Wollpert.

2009-04-01T23:59:59.000Z

127

Measurements of Wind and Turbulence Profiles with Scanning Doppler Lidar for Wind Energy Applications  

SciTech Connect

High-quality profiles of mean and turbulent statistics of the wind field upstream of a wind farm can be produced using a scanning Doppler lidar. Careful corrections for the spatial filtering of the wind field by the lidar pulse produce turbulence estimates equivalent to point sensors but with the added advantage of a larger sampling volume to increase the statistical accuracy of the estimates. For a well-designed lidar system, this permits accurate estimates of the key turbulent statistics over various subdomains and with sufficiently short observation times to monitor rapid changes in conditions. These features may be ideally suited for optimal operation of wind farms and also for improved resource assessment of potential sites.

Frehlich, R.; Kelley, N.

2008-03-01T23:59:59.000Z

128

Application of Raman spectroscopy to high-temperature analytical measurements  

Science Conference Proceedings (OSTI)

There are numerous analytical applications of scatter-emission and/or absorption spectroscopy applied to liquids and solids at 0 to 350 C. This paper describes an all-silica fiberoptic probe which is useful for spectral analyses from 0 to 1600 K and can be used in harsh chemical environments. The probe has been used for Raman spectral analyses of many molten salt and solid material systems to 1000 C. It has applications for such studies at higher temperature ranges. The instrumentation required along with the demonstrated and proposed applications of the all-silica probe are presented and discussed.

Young, J.P.; Dai, S.; Lee, Y.; Xizo, H.

1997-01-01T23:59:59.000Z

129

Targeted Observations with an Airborne Wind Lidar  

Science Conference Proceedings (OSTI)

This study investigates the possibilities and limitations of airborne Doppler lidar for adaptive observations over the Atlantic Ocean. For the first time, a scanning 2-?m Doppler lidar was applied for targeted measurements during the Atlantic “...

M. Weissmann; R. Busen; A. Dörnbrack; S. Rahm; O. Reitebuch

2005-11-01T23:59:59.000Z

130

Analysis of Airborne Doppler Lidar Measurements of the Extended California Sea Breeze  

Science Conference Proceedings (OSTI)

The analysis of airborne Doppler lidar data taken by NASA near the top of the planetary boundary layer in the central valley of California is presented. These data include downward wan angles that intercept the ground. The maximum errors in the ...

John J. Carroll

1989-10-01T23:59:59.000Z

131

Velocity Biases of Adaptive Filter Estimates in Heterodyne Doppler Lidar Measurements  

Science Conference Proceedings (OSTI)

Frequency estimates by heterodyne Doppler lidar (HDL) may result in velocity bias due to the atmospheric speckle effect and an asymmetrical power spectrum of the probing pulse, as discussed in a previous paper by Dabas et al. In this paper, it ...

Alain M. Dabas; Philippe Drobinski; Pierre H. Flamant

2000-09-01T23:59:59.000Z

132

The Properties and Formation of Cirrus Clouds over the Tibetan Plateau Based on Summertime Lidar Measurements  

Science Conference Proceedings (OSTI)

As part of the Tibet Ozone, Aerosol and Radiation (TOAR) project, a micropulse lidar was operated in Naqu (31.5°N, 92.1°E; 4508 m MSL) on the Tibetan Plateau to observe cirrus clouds continuously from 19 July to 26 August 2011. During the ...

Q. S. He; C. C. Li; J. Z. Ma; H. Q. Wang; G. M. Shi; Z. R. Liang; Q. Luan; F. H. Geng; X. W. Zhou

2013-03-01T23:59:59.000Z

133

Comparison between the TOPAZ Airborne Ozone Lidar and In Situ Measurements during TexAQS 2006  

Science Conference Proceedings (OSTI)

The NOAA airborne ozone lidar system [Tunable Optical Profiler for Aerosol and Ozone (TOPAZ)] is compared with the fast-response chemiluminescence sensor flown aboard the NOAA WP-3D during the 2006 Texas Air Quality Study (TexAQS). TOPAZ ...

A. O. Langford; C. J. Senff; R. J. Alvarez II; R. M. Banta; R. M. Hardesty; D. D. Parrish; T. B. Ryerson

2011-10-01T23:59:59.000Z

134

Shallow Angle Wave Profiling Lidar  

Science Conference Proceedings (OSTI)

A lidar scanning system is described that is primarily designed to measure sea wave shape. The device is capable of measuring real-time spatial profiles over distances of hundreds of meters, and as the lidar must inevitably operate from modest ...

M. R. Belmont; J. M. K. Horwood; R. W. F. Thurley; J. Baker

2007-06-01T23:59:59.000Z

135

Deriving a Framework for Estimating Individual Tree Measurements with Lidar for Use in the TAMBEETLE Southern Pine Beetle Infestation Growth Model  

E-Print Network (OSTI)

The overall goal of this study was to develop a framework for using airborne lidar to derive inputs for the SPB infestation growth model TAMBEETLE. The specific objectives were (1) to estimate individual tree characteristics of XY location, individual bole height (IBH), diameter at breast height (DBH), length of crown (CrHT), and age for use in TAMBEETLE; (2) to estimate individual tree age using lidar-estimated height and site index provided by the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Soil Survey Geographic Database (SSURGO); and (3) to compare TAMBEETLE simulation results using field measurements and lidarderived measurements as inputs. Diameter at breast height, individual bole height, and crown length were estimated using lidar with an error for mean measurements at plot level of 0.16cm, 0.19m, and 1.07m, respectively. These errors were within root mean square error (RMSE) for other studies at the study site. Age was estimated using the site index provided by SSURGO and the site index curves created for the study area with an RMSE of 4.8 years for mean plot age. Underestimation of tree height by lidar and error in the site index curve explained 91% of the error in mean plot age. TAMBEETLE was used to compare spot growth between a lidar-derived forest map and a forest map generated by TAMBEETLE, based on sample plot characteristics. The lidar-derived forest performed comparably to the TAMBEETLE generated forest. Using lidar to map forests can provide the large spatial extents of the TAMBEETLE generated forest while maintaining the spatially explicit forest characteristics, which were previously only available through field measurements.

Stukey, Jared D.

2009-12-01T23:59:59.000Z

136

Comparison of CW-Lidar-Measured Wind Values Obtained by Full Conical Scan, Conical Sector Scan and Two-Point Techniques  

Science Conference Proceedings (OSTI)

Continuous-wave (CW) Doppler lidar measurements of wind magnitude and direction that are based on radial velocity data on only a part of a full azimuth circle compare favorably with measurements based on a full circle. Winds were measured over an ...

R. L. Schwiesow; P. Köpp; Ch Werner

1985-03-01T23:59:59.000Z

137

Coherent anti-stokes Raman spectroscopy system for point temperature and major species concentration measurement  

DOE Green Energy (OSTI)

The Coherent anti-Stokes Raman Spectroscopy system (CARS) has been developed as a laser-based, advanced, combustion-diagnostic technique to measure temperature and major species concentration. Principles of operation, description of the system and its capabilities, and operational details of this instrument are presented in this report.

Singh, J.P.; Yueh, Fang-Yu

1993-10-01T23:59:59.000Z

138

Validation of NCAR 10.6-?m CO2 Doppler Lidar Radial Velocity Measurements and Comparison with a 915-MHz Profiler  

Science Conference Proceedings (OSTI)

The capability of the NCAR 10.6-?m-wavelength CO2 Doppler lidar to measure radial air motion is validated by examining hard-target test data, comparing measurements with those from a two-axis propeller anemometer and a 915-MHz profiling radar, ...

Shane D. Mayor; Donald H. Lenschow; Ronald L. Schwiesow; Jakob Mann; Charles L. Frush; Melinda K. Simon

1997-10-01T23:59:59.000Z

139

LIDAR Wind Speed Measurement Analysis and Feed-Forward Blade Pitch Control for Load Mitigation in Wind Turbines: January 2010--January 2011  

SciTech Connect

This report examines the accuracy of measurements that rely on Doppler LIDAR systems to determine their applicability to wind turbine feed-forward control systems and discusses feed-forward control system designs that use preview wind measurements. Light Detection and Ranging (LIDAR) systems are able to measure the speed of incoming wind before it interacts with a wind turbine rotor. These preview wind measurements can be used in feed-forward control systems designed to reduce turbine loads. However, the degree to which such preview-based control techniques can reduce loads by reacting to turbulence depends on how accurately the incoming wind field can be measured. The first half of this report examines the accuracy of different measurement scenarios that rely on coherent continuous-wave or pulsed Doppler LIDAR systems to determine their applicability to feed-forward control. In particular, the impacts of measurement range and angular offset from the wind direction are studied for various wind conditions. A realistic case involving a scanning LIDAR unit mounted in the spinner of a wind turbine is studied in depth with emphasis on choices for scan radius and preview distance. The effects of turbulence parameters on measurement accuracy are studied as well. Continuous-wave and pulsed LIDAR models based on typical commercially available units were used in the studies present in this report. The second half of this report discusses feed-forward control system designs that use preview wind measurements. Combined feedback/feed-forward blade pitch control is compared to industry standard feedback control when simulated in realistic turbulent above-rated winds. The feed-forward controllers are designed to reduce fatigue loads, increasing turbine lifetime and therefore reducing the cost of energy. Three feed-forward designs are studied: non-causal series expansion, Preview Control, and optimized FIR filter. The input to the feed-forward controller is a measurement of incoming wind speeds that could be provided by LIDAR. Non-causal series expansion and Preview Control methods reduce blade root loads but increase tower bending in simulation results. The optimized FIR filter reduces loads overall, keeps pitch rates low, and maintains rotor speed regulation and power capture, while using imperfect wind measurements provided by the spinning continuous-wave LIDAR model.

Dunne, F.; Simley, E.; Pao, L.Y.

2011-10-01T23:59:59.000Z

140

An Atmospheric Radiation Measurement Value-Added Product to Retrieve Optically Thin Cloud Visible Optical Depth using Micropulse Lidar  

Science Conference Proceedings (OSTI)

The purpose of the Micropulse Lidar (MPL) Cloud Optical Depth (MPLCOD) Value-Added Product (VAP) is to retrieve the visible (short-wave) cloud optical depth for optically thin clouds using MPL. The advantage of using the MPL to derive optical depth is that lidar is able to detect optically thin cloud layers that may not be detected by millimeter cloud radar or radiometric techniques. The disadvantage of using lidar to derive optical depth is that the lidar signal becomes attenuation limited when ? approaches 3 (this value can vary depending on instrument specifications). As a result, the lidar will not detect optically thin clouds if an optically thick cloud obstructs the lidar beam.

Lo, C; Comstock, JM; Flynn, C

2006-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Identification of Dynamical Processes at the Tropopause during the Decay of a Cutoff Low Using High-Resolution Airborne Lidar Ozone Measurements  

Science Conference Proceedings (OSTI)

In June 1996, an airborne ozone lidar was successfully used to observe the decay of a cutoff low over southern Europe. This weather system was tracked during several days and sampled with an 8-km horizontal resolution. Most of the measurements ...

F. Ravetta; G. Ancellet

2000-09-01T23:59:59.000Z

142

Partial CO2 Column-Averaged Dry-Air Mixing Ratio from Measurements by Coherent 2-?m Differential Absorption and Wind Lidar with Laser Frequency Offset Locking  

Science Conference Proceedings (OSTI)

A coherent 2-?m differential absorption and wind lidar (Co2DiaWiL) with a 2-?m single-frequency Q-switched laser with laser frequency offset locking was used for long-range CO2 measurement. The frequency stabilization of the single-frequency ? on ...

Shoken Ishii; Kohei Mizutani; Philippe Baron; Hironori Iwai; Ryoko Oda; Toshikazu Itabe; Hirotake Fukuoka; Takayoshi Ishikawa; Mizuki Koyama; Tomoaki Tanaka; Isamu Morino; Osamu Uchino; Atsushi Sato; Kazuhiro Asai

2012-09-01T23:59:59.000Z

143

ARM - Measurement - Backscatter depolarization ratio  

NLE Websites -- All DOE Office Websites (Extended Search)

govMeasurementsBackscatter depolarization ratio govMeasurementsBackscatter depolarization ratio ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Backscatter depolarization ratio The ratio of cross polarized to co-polarized elastic backscatter. Categories Aerosols Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments HSRL : High Spectral Resolution Lidar RL : Raman Lidar Field Campaign Instruments HSRL : High Spectral Resolution Lidar MIRAI : JAMSTEC Research Vessel Mirai MPL-AIR : Micropulse Lidar- Airborne

144

Range–Height Scans of Lidar Depolarization for Characterizing Properties and Phase of Clouds and Precipitation  

Science Conference Proceedings (OSTI)

Backscatter and depolarization lidar measurements from clouds and precipitation are reported as functions of the elevation angle of the pointing lidar direction. The data were recorded by scanning the lidar beam (Nd:YAG) at a constant angular ...

Luc R. Bissonnette; Gilles Roy; Frédéric Fabry

2001-09-01T23:59:59.000Z

145

A light detection and ranging (lidar) study of the Sierra Nevada.  

E-Print Network (OSTI)

??Light Detection and Ranging (lidar) has been used widely for the remote sensing of multiple parameters from earth’s surface. Lidar systems are used to measure… (more)

Phelps, Gary M. II

2011-01-01T23:59:59.000Z

146

Measurement of Water Vapor Flux Profiles in the Convective Boundary Layer with Lidar and Radar-RASS  

Science Conference Proceedings (OSTI)

A remote-sensing method to retrieve vertical profiles of water vapor flux in the convective boundary layer by using a differential absorption lidar and a radar-radio acoustic sounding system is described. The system's height range presently ...

Christoph Senff; Jens Bösenberg; Gerhard Peters

1994-02-01T23:59:59.000Z

147

Intercomparison of Water Vapor Data Measured with Lidar during IHOP_2002. Part II: Airborne-to-Airborne Systems  

Science Conference Proceedings (OSTI)

The dataset of the International H2O Project (IHOP_2002) gives the first opportunity for direct intercomparisons of airborne water vapor lidar systems and allows very important conclusions to be drawn for future field campaigns. Three airborne ...

Andreas Behrendt; Volker Wulfmeyer; Thorsten Schaberl; Hans-Stefan Bauer; Christoph Kiemle; Gerhard Ehret; Cyrille Flamant; Susan Kooi; Syed Ismail; Richard Ferrare; Edward V. Browell; David N. Whiteman

2007-01-01T23:59:59.000Z

148

Ranging Through Shallow Semitransparent Media with Polarization Lidar  

Science Conference Proceedings (OSTI)

A new approach to shallow depth measurement (< 2 m) using polarization lidar is presented. The transmitter consists of a 532 nm linearly polarized laser coupled with conditioning and polarization optics. The prototype lidar evaluates the differing ...

Steven E. Mitchell; Jeffrey P. Thayer

149

Algorithm Development of the Aglite-Lidar Instrument.  

E-Print Network (OSTI)

??The Aglite system is a three-wavelength lidar plus a suite of instruments for measuring particulate emission levels near agricultural facilities. The lidar performs 3D scans… (more)

Marchant, Christian

2008-01-01T23:59:59.000Z

150

Comparison of Raman Scattering Measurements and Modeling in NIF Ignition Experiments  

Science Conference Proceedings (OSTI)

Recent NIF indirect-drive experiments have shown significant Raman scattering from the inner beams. NIF data has motivated improvements to rad-hydro modeling, leading to the 'high flux model' [M. D. Rosen et al., HEDP 7, 180 (2011)]. Cross-beam energy transfer [P. A. Michel et al., Phys. Plasmas 17, 056305 (2010] in the laser entrance hole is an important tool for achieving round implosions, and is uniformly distributed across the laser spot in rad-hydro simulations (but not necessarily in experiments). We find the Raman linear gain spectra computed with these plasma conditions agree well in time-dependent peak wavelength with the measured data, especially when overlapping laser-beam intensities are used. More detailed, spatially non-uniform modeling of the cross-beam transfer has been performed. The resulting gains better follow the time history of the measured backscatter. We shall present the impact of spatially non-uniform energy transfer on SRS gain. This metric is valid when amplification is in a linear regime, and so we shall also present an assessment of whether electron trapping in Langmuir waves can play a role in these shots.

Strozzi, D J; Hinkel, D E; Williams, E A; Town, R J; Michel, P A; Divol, L; Berger, R L; Moody, J D

2011-11-04T23:59:59.000Z

151

Cloud properties derived from two lidars over the ARM SGP site  

Science Conference Proceedings (OSTI)

[1] Active remote sensors such as lidars or radars can be used with other data to quantify the cloud properties at regional scale and at global scale (Dupont et al., 2009). Relative to radar, lidar remote sensing is sensitive to very thin and high clouds but has a significant limitation due to signal attenuation in the ability to precisely quantify the properties of clouds with a 20 cloud optical thickness larger than 3. In this study, 10-years of backscatter lidar signal data are analysed by a unique algorithm called STRucture of ATmosphere (STRAT, Morille et al., 2007). We apply the STRAT algorithm to data from both the collocated Micropulse lidar (MPL) and a Raman lidar (RL) at the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) site between 1998 and 2009. Raw backscatter lidar signal is processed and 25 corrections for detector deadtime, afterpulse, and overlap are applied. (Campbell et al.) The cloud properties for all levels of clouds are derived and distributions of cloud base height (CBH), top height (CTH), physical cloud thickness (CT), and optical thickness (COT) from local statistics are compared. The goal of this study is (1) to establish a climatology of macrophysical and optical properties for all levels of clouds observed over the ARM SGP site 30 and (2) to estimate the discrepancies induced by the two remote sensing systems (pulse energy, sampling, resolution, etc.). Our first results tend to show that the MPLs, which are the primary ARM lidars, have a distinctly limited range where all of these cloud properties are detectable, especially cloud top and cloud thickness, but even actual cloud base especially during summer daytime period. According to the comparisons between RL and MPL, almost 50% of situations show a signal to noise ratio too low (smaller than 3) for the MPL in order to detect clouds higher than 7km during daytime period in summer. Consequently, the MPLderived annual cycle of cirrus cloud base (top) altitude is biased low, especially for daylight periods, compared with those derived from the RL data, which detects 5 cloud base ranging from 7.5 km in winter to 9.5 km in summer (and tops ranging from 8.6 to 10.5 km). The optically thickest cirrus clouds (COT>0.3) reach 50% of the total population for the Raman lidar and only 20% for the Micropulse lidar due to the difference of pulse energy and the effect of solar irradiance contamination. A complementary study using the cloud fraction 10 derived from the Micropulse lidar for clouds below 5 km and from the Raman lidar for cloud above 5 km allows for better estimation of the total cloud fraction between the ground and the top of the atmosphere. This study presents the diurnal cycle of cloud fraction for each season in comparisons with the Long et al. (2006) cloud fraction calculation derived from radiative flux analysis.

Dupont, Jean-Charles; Haeffelin, Martial; Morille, Y.; Comstock, Jennifer M.; Flynn, Connor J.; Long, Charles N.; Sivaraman, Chitra; Newsom, Rob K.

2011-02-16T23:59:59.000Z

152

ARM - Measurement - Aerosol scattering  

NLE Websites -- All DOE Office Websites (Extended Search)

Spectrometer RL : Raman Lidar Field Campaign Instruments AOS : Aerosol Observing System DRI-GND : Desert Research Institute Ground-Based Aerosol Instruments AEROSOL-TOWER-EML :...

153

Errors for Space-Based Doppler Lidar Wind Measurements: Definition, Performance, and Verification  

Science Conference Proceedings (OSTI)

Verification of space-based wind measurements will be difficult because of the random variations of the atmospheric velocity field over the measurement volume. The definition of accuracy requires a definition of “truth.” For this work, truth is ...

Rod Frehlich

2001-11-01T23:59:59.000Z

154

INTERCOMPARISON OF WATER VAPOR CALIBRATION CONSTANTS DERIVED FROM IN-SITU AND DISTANT SOUNDINGS FOR A RAMAN-LIDAR OPERATING IN THE AMAZON  

E-Print Network (OSTI)

INTERCOMPARISON OF WATER VAPOR CALIBRATION CONSTANTS DERIVED FROM IN-SITU AND DISTANT SOUNDINGS such measurements on tropical regions. Indeed, there were important field campaigns in the Amazon that explored some

Barbosa, Henrique

155

Exploring the relationships between vegetation measurements and temperature in residential areas by integrating LIDAR and remotely sensed imagery  

E-Print Network (OSTI)

Population growth and urban sprawl have contributed to the formation of significant urban heat island phenomena in Houston, Texas, the fourth largest city in the United States. The population growth in Houston was 25.8% between 1990 and 2000 nearly double the national average. The demand for information concerning the effects of urban and suburban development is growing. Houston is currently the only major US city lacking any kind of comprehensive city zoning ordinances. The Normalized Difference Vegetation Index (NDVI) has been used as a surrogate variable to estimate land surface temperatures at higher spatial resolutions, given the fact that a high-resolution remotely sensed NDVI can be created almost effortlessly and remotely sensed thermal data at higher resolutions is much more difficult to obtain. This has allowed researchers to study urban heat island dynamics at a micro-scale. However, this study suggests that a vegetation index alone might not be the best surrogate variable for providing information regarding the independent effects and level of contribution that tree canopy, grass, and low-lying plants have on surface temperatures in residential neighborhoods. This research combines LIDAR (Light Detection and Ranging) feature height data and high-resolution infrared aerial photos to measure the characteristics of the micro-structure of residential areas (residentialstructure), derives various descriptive vegetation measurement statistics, and correlates the spatial distribution of surface temperature to the type and amount of vegetation cover in residential areas. Regression analysis is used to quantify the independent influence that different residential-structures have on surface temperature. In regard to implementing changes at a neighborhood level, the descriptive statistics derived for residential-structure at a micro-scale may provide useful information to decision-makers and may reveal a guide for future developers concerned with mitigating the negative effects of urban heat island phenomena.

Clemonds, Matthew A

2005-08-01T23:59:59.000Z

156

Lidar Observations of Aircraft Exhaust Plumes  

Science Conference Proceedings (OSTI)

A series of field campaigns has been made at British airports using a rapid-scanning lidar and other instrumentation in order to measure the dispersion of exhaust plumes from commercial aircraft. The lidar operated at a wavelength of 355 nm and ...

Michael Bennett; Simon Christie; Angus Graham; David Raper

2010-10-01T23:59:59.000Z

157

Lidar-Measured Wind Profiles – The Missing Link in the Global Observing System  

Science Conference Proceedings (OSTI)

The three-dimensional global wind field is the most important remaining measurement needed to accurately assess the dynamics of the atmosphere. Wind information in the tropics, high latitudes, and stratosphere, is particularly deficient. Furthermore, only ...

Wayman E. Baker; Robert Atlas; Carla Cardinali; Amy Clement; George D. Emmitt; Bruce M. Gentry; R. Michael Hardesty; Erland Källén; Michael J. Kavaya; Rolf Langland; Zaizhong Ma; Michiko Masutani; Will McCarty; R. Bradley Pierce; Zhaoxia Pu; Lars Peter Riishojgaard; James Ryan; Sara Tucker; Martin Weissmann; James G. Yoe

158

Aspects of Convective Boundary Layer Turbulence Measured by a Dual-Doppler Lidar System  

Science Conference Proceedings (OSTI)

Special designed dual-Doppler setups can be used to retrieve simultaneous measurements of two wind components with high temporal resolution in several heights throughout the atmospheric boundary layer. During a field campaign in summer 2011, ...

Luisa Röhner; Katja Träumner

2013-09-01T23:59:59.000Z

159

An all-solid-state transportable narrowband sodium lidar for mesopause region temperature and horizontal wind measurements  

E-Print Network (OSTI)

that it will match the optics of the photo detection system (a PMT or an avalanche diode), with or without the used the fiber output and the photo detection system, which contains a photo detector and a 1 nm wide optics design is outside the scope of this paper, but has been proven successful with the lidar system

Williams, Bifford P.

160

Lidar and Triple-Wavelength Doppler Radar Measurements of the Melting Layer: A Revised Model for Dark- and Brightband Phenomena  

Science Conference Proceedings (OSTI)

During the recent Cirrus Regional Study of Tropical Anvils and Cirrus Layers (CRYSTAL) Florida Area Cirrus Experiment (FACE) field campaign in southern Florida, rain showers were probed by a 0.523-?m lidar and three (0.32-, 0.86-, and 10.6-cm ...

Kenneth Sassen; James R. Campbell; Jiang Zhu; Pavlos Kollias; Matthew Shupe; Christopher Williams

2005-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
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161

High-Spectral Resolution Lidar Measurement of Tropospheric Backscatter Ratio Using Barium Atomic Blocking Filters  

Science Conference Proceedings (OSTI)

Initial measurements of the aerosol backscatter ratio using a new atomic barium filter (FWHM from 2.0–3.0 GHz at 553.7 nm) in conjunction with a narrowband-pulsed dye laser system are reported. Using analog detection and a 0.2 m diameter ...

R. J. Alvarez II; L. M. Caldwell; V. H. Li; D. A. Krueger; C. Y. She

1990-12-01T23:59:59.000Z

162

Interpretation of Accurate UV Polarization Lidar Measurements: Application to Volcanic Ash Number Concentration Retrieval  

Science Conference Proceedings (OSTI)

In this paper, accurate UV polarization measurements are performed on a volcanic ash cloud after long-range transport at Lyon, France (45.76°N, 4.83°E). The volcanic particles are released from the mid-April 2010 eruption of the Eyjafjallajökull ...

A. Miffre; G. David; B. Thomas; M. Abou Chacra; P. Rairoux

2012-04-01T23:59:59.000Z

163

Satellite and Correlative Measurements of the Stratospheric Aerosol. III: Comparison of Measurements by SAM II, SAGE, Dustsondes, Filters, Impactors and Lidar  

Science Conference Proceedings (OSTI)

A large satellite validation experiment was conducted at Poker Flat, Alaska, 16–19 July 1979. Instruments included the SAM II and SAGE satellite sensors, dustsondes impactors, a fitter collector and an airborne lidar. We show that the extinction ...

P. B. Russell; M. P. McCormick; T. J. Swissler; J. M. Rosen; D. J. Hofmann; L. R. McMaster

1984-06-01T23:59:59.000Z

164

Photo-oxidation of Ge Nanocrystals: Kinetic Measurements by InSitu Raman Spectroscopy  

SciTech Connect

Ge nanocrystals are formed in silica by ion beam synthesis and are subsequently exposed by selective HF etching of the silica. Under ambient conditions, the exposed nanocrystals are stable after formation of a protective native oxide shell of no more than a few monolayers. However, under visible laser illumination at room temperature and in the presence of O{sub 2}, the nanocrystals rapidly oxidize. The oxidation rate was monitored by measuring the Raman spectra of the Ge nanocrystals in-situ. The intensity ratio of the anti-Stokes to the Stokes line indicated that no significant laser-induced heating of illuminated nanocrystals occurs. Therefore, the oxidation reaction rate enhancement is due to a photo-chemical process. The oxidation rate varies nearly linearly with the logarithm of the laser intensity, and at constant laser intensity the rate increases with increasing photon energy. These kinetic measurements, along with the power dependencies, are described quantitatively by an electron active oxidation mechanism involving tunneling of optically excited electrons through the forming oxide skin and subsequent transport of oxygen ions to the Ge nanocrystal surface.

Sharp, I.D.; Xu, Q.; Yuan, C.W.; Beeman, J.W.; Ager III, J.W.; Chrzan, D.C.; Haller, E.E.

2006-11-22T23:59:59.000Z

165

Micropulse Lidar Cloud Mask Value-Added Product Technical Report  

Science Conference Proceedings (OSTI)

Lidar backscattered signal is a useful tool for identifying vertical cloud structure in the atmosphere in optically thin clouds. Cloud boundaries derived from lidar signals are a necessary input for popular ARM data products, such as the Active Remote Sensing of Clouds (ARSCL) product. An operational cloud boundary algorithm (Wang and Sassen 2001) has been implemented for use with the ARM Micropulse Lidar (MPL) systems. In addition to retrieving cloud boundaries above 500 m, the value-added product (VAP) named Micropulse Lidar Cloud Mask (MPLCMASK) applies lidar-specific corrections (i.e., range-square, background, deadtime, and overlap) as described in Campbell et al. (2002) to the measured backscattered lidar. Depolarization ratio is computed using the methodology developed by Flynn et al. (2007) for polarization-capable MPL systems. The cloud boundaries output from MPLCMASK will be the primary lidar cloud mask for input to the ARSCL product and will be applied to all MPL systems, including historical data sets.

Sivaraman, C; Comstock, J

2011-07-25T23:59:59.000Z

166

Notes on Temperature-Dependent Lidar Equations  

Science Conference Proceedings (OSTI)

The temperature dependence of molecular backscatter coefficients must be taken into account when narrowband interference filters are used in lidar measurements. Thus, the spectral backscatter differential cross section of the molecules involved ...

Mariana Adam

2009-06-01T23:59:59.000Z

167

Inverse Raman spectroscopy measurements of line-shift coefficients in hydrogen perturbed by argon  

DOE Green Energy (OSTI)

High resolution Raman studies of the Q branch in H[sub 2] perturbed by Ar are relevant to combustion diagnostics and for tests of the intermolecular potential. The use of spectroscopic techniques to study combustion requires accurate models for the line shapes which can range from Lorentzian to Gaussian to more complicated profiles depending on the perturber species, perturber concentration, density and temperature. Calculations with these models require estimates of the speed dependence of the line-shift and line-broadening coefficients. Modern theories are now able to predict the shifting and broadening resulting from collisions but are hampered by uncertainties in the interaction potential. One of the most studied potentials is that of H[sub 2]-Ar which has the advantage of being theoretically tractable for line shape computations. Furthermore, since the masses of Ar and molecular O[sub 2] and N[sub 2] are similar, spectral features depending on the perturber's mass are expected to be similar. We report preliminary measurements of the density shift of the Q branch lines in H[sub 2] as a function of rotational state and temperature.

Forsman, J.W.; Farrow, R.L.; Rahn, L.A.

1993-01-01T23:59:59.000Z

168

Inverse Raman spectroscopy measurements of line-shift coefficients in hydrogen perturbed by argon  

DOE Green Energy (OSTI)

High resolution Raman studies of the Q branch in H{sub 2} perturbed by Ar are relevant to combustion diagnostics and for tests of the intermolecular potential. The use of spectroscopic techniques to study combustion requires accurate models for the line shapes which can range from Lorentzian to Gaussian to more complicated profiles depending on the perturber species, perturber concentration, density and temperature. Calculations with these models require estimates of the speed dependence of the line-shift and line-broadening coefficients. Modern theories are now able to predict the shifting and broadening resulting from collisions but are hampered by uncertainties in the interaction potential. One of the most studied potentials is that of H{sub 2}-Ar which has the advantage of being theoretically tractable for line shape computations. Furthermore, since the masses of Ar and molecular O{sub 2} and N{sub 2} are similar, spectral features depending on the perturber`s mass are expected to be similar. We report preliminary measurements of the density shift of the Q branch lines in H{sub 2} as a function of rotational state and temperature.

Forsman, J.W.; Farrow, R.L.; Rahn, L.A.

1993-12-31T23:59:59.000Z

169

Lidar Scanning of Momentum Flux in and above the Atmospheric Surface Layer  

Science Conference Proceedings (OSTI)

Methods to measure the vertical flux of horizontal momentum using both continuous wave and pulsed Doppler lidar profilers are evaluated. The lidar measurements are compared to momentum flux observations performed with sonic anemometers over flat ...

J. Mann; A. Peña; F. Bingöl; R. Wagner; M. S. Courtney

2010-06-01T23:59:59.000Z

170

2001: Surface estimation based on LIDAR  

E-Print Network (OSTI)

In the past several years, the use of airborne laser systems or LIDAR for the rapid collection of digital terrain models (DTMs) has proliferated. Flood plain studies, contouring, road engineering projects, volumetric computations, ortho-photo production, and mapping for beach erosion are just some of the applications driving the demand for this technology. The ability of LIDAR systems to capture accurate spot heights at an extremely rapid rate is the principle reason behind LIDAR's success. Many applications, for example, contouring, require a bald-earth DTM. Unfortunately, the raw data points captured by LIDAR do not constitute a bald-earth DTM. Even though most LIDAR systems can measure "lastreturn" data points, these "last-return " points often measure ground clutter like shrubbery, cars, buildings, and even the canopy of dense foliage. Consequently, raw LIDAR points must be post-processed to remove these undesirable returns. The degree to which this post processing is successful is critical in determining whether LIDAR is cost effective for large-scale mapping applications. We present our approach to estimating bald-earth surfaces from LIDAR data. Our approach is different from typical approaches in that we estimate a surface based on the original LIDAR points while at the same time considering important supplementary information. This other information includes independently measured breaklines and surface categories. We use a least-squares adjustment with robust estimation similar to that proposed by (Kraus, Pfeifer, 1998). The surface model is represented using a triangular irregular network or TIN. We present examples from a real mapping project that demonstrate the success of this approach.

Wolfgang Schickler; Anthony Thorpe

2001-01-01T23:59:59.000Z

171

Validation of aerosol extinction and water vapor profiles from routine Atmospheric Radiation Measurement Climate Research Facility measurements  

Science Conference Proceedings (OSTI)

The accuracy with which vertical profiles of aerosol extinction ?ep(?) can be retrieved from ARM Climate Research Facility (ACRF) routine measurements was assessed using data from two airborne field campaigns, the ARM Aerosol Intensive Operation Period (AIOP, May 2003), and the Aerosol Lidar Validation Experiment (ALIVE, September 2005). This assessment pertains to the aerosol at its ambient concentration and thermodynamic state (i.e. ?ep(?) either free of or corrected for sampling artifacts) and includes the following ACRF routine methods: Raman Lidar, Micro Pulse Lidar (MPL) and in-situ aerosol profiles (IAP) with a small aircraft. Profiles of aerosol optical depth ?p(???, from which the profiles of ?ep(???are derived through vertical differentiation, were measured by the NASA Ames Airborne Tracking 14-channel Sunphotometer (AATS-14); these data were used as truth in this evaluation. The ACRF IAP ?ep(550 nm) were lower by 16% (during AIOP) and higher by 10% (during ALIVE) when compared to AATS-14. The ACRF MPL ?ep(523 nm) were higher by 24% (AIOP) and 19%-21% (ALIVE) compared to AATS-14 but the correlation improved significantly during ALIVE. In the AIOP a second MPL operated by NASA showed a smaller positive bias (13%) with respect to AATS-14. The ACRF Raman Lidar ?ep(355 nm) were higher by 54% (AIOP) and higher by 6% (ALIVE) compared to AATS-14. The large bias in AIOP stemmed from a gradual loss of the sensitivity of the Raman Lidar starting about the end of 2001 going unnoticed until after AIOP. A major refurbishment and upgrade of the instrument and improvements to a data-processing algorithm led to the significant improvement and very small bias in ALIVE. Finally we find that during ALIVE the Raman Lidar water vapor densities ?w are higher by 8% when compared to AATS-14, whereas comparisons between AATS-14 and in-situ measured ?w aboard two different aircraft showed small negative biases (0 to -3%).

Schmid, Beat; Flynn, Connor J.; Newsom, Rob K.; Turner, David D.; Ferrare, Richard; Clayton, Marian F.; Andrews, Elisabeth; Ogren, John A.; Johnson, Roy R.; Russell, P. B.; Gore, W.; Dominguez, Roseanne

2009-11-26T23:59:59.000Z

172

Definition: LiDAR | Open Energy Information  

Open Energy Info (EERE)

LiDAR LiDAR Jump to: navigation, search Dictionary.png LiDAR Light Detection and Ranging (LiDAR) is an active remote sensing technology that uses optical measurements of scattered light to find range (Young, 2006). Measurements can be made from aircraft- or land-based sensors. Distance to an object is determined by the time delay between transmission and detection of a laser pulse. It is accurate to within 0.1 m (at 1-m resolution, 0.3 m at 3-m resolution) and has the ability to measure the land surface elevation beneath the vegetation canopy. View on Wikipedia Wikipedia Definition Also Known As Light Detection And Ranging Related Terms DEM, Digital Elevation Model tran LikeLike UnlikeLike You like this.Sign Up to see what your friends like. smission lines,transmission line,transmission

173

The Ability of MM5 to Simulate Ice Clouds: Systematic Comparison between Simulated and Measured Fluxes and Lidar/Radar Profiles at SIRTA Atmospheric Observatory  

SciTech Connect

Ice clouds play a major role in the radiative energy budget of the Earth-atmosphere system (Liou 1986). Their radiative effect is governed primarily by the equilibrium between their albedo and greenhouse effects. Both macrophysical and microphysical properties of ice clouds regulate this equilibrium. For quantifying the effect of these clouds onto climate and weather systems, they must be properly characterized in atmospheric models. In this paper we use remote-sensing measurements from the SIRTA ground based atmospheric observatory (Site Instrumental de Recherche par Teledetection Atmospherique, http://sirta.lmd.polytechnique.fr). Lidar and radar observations taken over 18 months are used, in order to gain statistical confidence in the model evaluation. Along this period of time, 62 days are selected for study because they contain parts of ice clouds. We use the ''model to observations'' approach by simulating lidar and radar signals from MM5 outputs. Other more classical variables such as shortwave and longwave radiative fluxes are also used. Four microphysical schemes, among which that proposed by Reisner et al. (1998) with original or modified parameterizations of particle terminal fall velocities (Zurovac-Jevtic and Zhang 2003, Heymsfield and Donner 1990), and the simplified Dudhia (1989) scheme are evaluated in this study.

Chiriaco, M.; Vautard, R.; Chepfer, H.; Haeffelin, M.; Wanherdrick, Y.; Morille, Y.; Protat, A.; Dudhia, J.

2005-03-18T23:59:59.000Z

174

Analysis and Processing of Airborne LIDAR Data  

E-Print Network (OSTI)

Airborne LIDAR systems have been in use for many years to measure points on the earth's surface. They can rapidly produce accurate digital surface models and offer significantly lower costs in field operations and post-processing compared to traditional survey methods. This makes the LIDAR technology an attractive alternative for a variety of mapping applications. From scattered 3-D point clouds to useful representations for end-users requires further research and development of post-processing algorithms. Up to now, the post-processing of LIDAR data is still in an early phase of development because no single technique currently is considered optimum or satisfactory for all conditions and requirements.

Yong Hu

2001-01-01T23:59:59.000Z

175

Measured and Estimated Water Vapor Advection in the Atmospheric Surface Layer  

Science Conference Proceedings (OSTI)

The flux of water vapor due to advection is measured using high resolution Raman lidar that was orientated horizontally across a land-lake transition. At the same time, a full surface energy balance is performed to assess the impact of scalar ...

Chad W. Higgins; Eric Pardyjak; Martin Froidevaux; Valentin Simeonov; Marc B. Parlange

176

H.: The Bonn University lidar at the Esrange: technical description and capabilties for atmospheric research  

E-Print Network (OSTI)

Raman backscatter lidar at the Esrange near the Swedish city of Kiruna, north of the Arctic circle. The lidar system covers the atmosphere from about 4 km to 100 km altitude and it is capable of measuring aerosols in the tropo-, strato-, and mesosphere, as well as of determining temperature profiles in the aerosol-free part of the atmosphere (i.e. above 30-km altitude). Density tuned fixed-spacer etalons provide daylight capability and thus increased sensitivity to noctilucent clouds during polar summer. Polarisation measurements allow liquid and solid phase discrimination for aerosol and cloud particles in the tropo- and stratosphere. The derived temperature profiles can be used for the detection and analysis of atmospheric gravity waves. Although several lidar experiments are situated in polar latitudes, a comprehensive instrument which covers the troposphere, stratosphere, and mesosphere, is daylight capable, and observes temperature profiles, as well as aerosols, is exceptional. In this article a technical description, in particular, of the optical configuration of this experiment is given, as well as an overview of achievable geophysical parameters. The potential for geophysical analyses is shown.

U. Blum; K. H. Fricke

2005-01-01T23:59:59.000Z

177

Doppler Lidar (DL) Handbook  

SciTech Connect

The Doppler lidar (DL) is an active remote sensing instrument that provides range- and time-resolved measurements of radial velocity and attenuated backscatter. The principle of operation is similar to radar in that pulses of energy are transmitted into the atmosphere; the energy scattered back to the transceiver is collected and measured as a time-resolved signal. From the time delay between each outgoing transmitted pulse and the backscattered signal, the distance to the scatterer is inferred. The radial or line-of-sight velocity of the scatterers is determined from the Doppler frequency shift of the backscattered radiation. The DL uses a heterodyne detection technique in which the return signal is mixed with a reference laser beam (i.e., local oscillator) of known frequency. An onboard signal processing computer then determines the Doppler frequency shift from the spectra of the heterodyne signal. The energy content of the Doppler spectra can also be used to determine attenuated backscatter.

Newsom, RK

2012-02-13T23:59:59.000Z

178

Lidar Observations of the Vertical Aerosol Flux in the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

The vertical aerosol transport in the planetary boundary layer (PBL) is investigated with lidars. Profiles of the vertical wind velocity are measured with a 2-?m Doppler wind lidar. Aerosol parameters are derived from observations with an aerosol ...

Ronny Engelmann; Ulla Wandinger; Albert Ansmann; Detlef Müller; Egidijus Žeromskis; Dietrich Althausen; Birgit Wehner

2008-08-01T23:59:59.000Z

179

The Doppler Aerosol Wind Lidar (DAWN) Airborne, Wind-Profiling, Coherent-Detection Lidar System: Overview and Preliminary Flight Results  

Science Conference Proceedings (OSTI)

The first airborne wind measurements of a pulsed, 2-micron solid-state, high-energy, wind-profiling lidar system for airborne measurements are presented. The laser pulse energy is the highest to date in an eyesafe airborne wind lidar system. This ...

Michael J. Kavaya; Jeffrey Y. Beyon; Grady J. Koch; Mulugeta Petros; Paul J. Petzar; Upendra N. Singh; Bo C. Trieu; Jirong Yu

180

Lidar-Transmissometer Visibility Comparisons Over Slant and Horizontal Paths  

Science Conference Proceedings (OSTI)

Atmospheric visibility has been measured with the lidar technique using the “slope method.” The system is briefly described and some aspects of slant path visibility measurements for aeronautical applications are discussed. Measurements in dense ...

J. L. Gaumet; A. Petitpa

1982-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

A Study of Air Quality in the Southeastern Hampton–Norfolk–Virginia Beach Region with Airborne Lidar Measurements and MODIS Aerosol Optical Depth Retrievals  

Science Conference Proceedings (OSTI)

A study of air quality was performed using a compact, aircraft aerosol lidar designed in the Science Directorate at NASA Langley Research Center and Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical depth (AOD) retrievals. ...

Jasper Lewis; Russell De Young; D. Allen Chu

2010-01-01T23:59:59.000Z

182

Determination of Planetary Boundary Layer Height on Short Spatial and Temporal Scales: A Demonstration of the Covariance Wavelet Transform in Ground-Based Wind Profiler and Lidar Measurements  

Science Conference Proceedings (OSTI)

This article explores the application of the covariance wavelet transform (CWT) to lidar and, for the first time to the authors' knowledge, wind profiler data to examine the possibility of accurate and continuous planetary boundary layer (PBL) ...

Jaime C. Compton; Ruben Delgado; Timothy A. Berkoff; Raymond M. Hoff

2013-07-01T23:59:59.000Z

183

Cloud Top Liquid Water from Lidar Observations of Marine Stratocumulus  

Science Conference Proceedings (OSTI)

Maine stratus clouds were simultaneously observed by nadir Nd:YAG lidar measurements and in situ cloud physics measurements. A procedure was applied to derive the two-dimensional vertical cross section of the liquid water from within the cloud ...

J. D. Spinhirne; R. Boers; W. D. Hart

1989-02-01T23:59:59.000Z

184

Continuous Observations of Aerosol Profiles with a Two-Wavelength Mie-Scattering Lidar in Guangzhou in PRD2006  

Science Conference Proceedings (OSTI)

Continuous lidar observation was performed in Guangzhou, China, in the Pearl River Delta (PRD) observation campaign in July 2006 (PRD2006), using a two-wavelength Mie-scattering lidar (532 and 1064 nm) with a depolarization measurement channel at ...

Nobuo Sugimoto; Tomoaki Nishizawa; Xingang Liu; Ichiro Matsui; Atsushi Shimizu; Yuanhang Zhang; Young J. Kim; Ruhao Li; Jun Liu

2009-09-01T23:59:59.000Z

185

Horizontal-Velocity and Variance Measurements in the Stable Boundary Layer Using Doppler Lidar: Sensitivity to Averaging Procedures  

Science Conference Proceedings (OSTI)

Quantitative data on turbulence variables aloft—above the region of the atmosphere conveniently measured from towers—have been an important but difficult measurement need for advancing understanding and modeling of the stable boundary layer (SBL)...

Yelena L. Pichugina; Sara C. Tucker; Robert M. Banta; W. Alan Brewer; Neil D. Kelley; Bonnie J. Jonkman; Rob K. Newsom

2008-08-01T23:59:59.000Z

186

LIDAR, Point Clouds, and their Archaeological Applications  

SciTech Connect

It is common in contemporary archaeological literature, in papers at archaeological conferences, and in grant proposals to see heritage professionals use the term LIDAR to refer to high spatial resolution digital elevation models and the technology used to produce them. The goal of this chapter is to break that association and introduce archaeologists to the world of point clouds, in which LIDAR is only one member of a larger family of techniques to obtain, visualize, and analyze three-dimensional measurements of archaeological features. After describing how point clouds are constructed, there is a brief discussion on the currently available software and analytical techniques designed to make sense of them.

White, Devin A [ORNL

2013-01-01T23:59:59.000Z

187

ARM - Measurement - Cloud base height  

NLE Websites -- All DOE Office Websites (Extended Search)

base height base height ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Cloud base height For a given cloud or cloud layer, the lowest level of the atmosphere where cloud properties are detectable. Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments BLC : Belfort Laser Ceilometer MPL : Micropulse Lidar MWRP : Microwave Radiometer Profiler RL : Raman Lidar VCEIL : Vaisala Ceilometer External Instruments NOAASURF : NOAA Surface Meteorology Data, collected by NWS and NCDC

188

Microsoft PowerPoint - arm_stm_poster_2007_carl [Compatibility...  

NLE Websites -- All DOE Office Websites (Extended Search)

SG Aerosol and Water Vapor Measurements Acquired by the Upgraded SGP Raman Lidar During ALIVE Aerosol and Water Vapor Measurements Acquired by the Upgraded SGP Raman Lidar During...

189

Lidar Observations of Ship Spray Plumes  

Science Conference Proceedings (OSTI)

As part of the Monterey Area Ship Track experiment, which was designed to study ship-generated cloud tracks, ship-based measurements were made by a gyroscopically stabilized scanning lidar system. This paper focuses on the spray plume observed by ...

William P. Hooper; Jeffrey E. James

2000-08-01T23:59:59.000Z

190

Doppler Lidar–Based Wind-Profile Measurement System for Offshore Wind-Energy and Other Marine Boundary Layer Applications  

Science Conference Proceedings (OSTI)

Accurate measurement of wind speed profiles aloft in the marine boundary layer is a difficult challenge. The development of offshore wind energy requires accurate information on wind speeds above the surface at least at the levels occupied by ...

Yelena L. Pichugina; Robert M. Banta; W. Alan Brewer; Scott P. Sandberg; R. Michael Hardesty

2012-02-01T23:59:59.000Z

191

Characterization of Advanced Avalanche Photodiodes for Water Vapor Lidar Receivers  

Science Conference Proceedings (OSTI)

Development of advanced differential absorption lidar (DIAL) receivers is very important to increase the accuracy of atmospheric water vapor measurements. A major component of such receivers is the optical detector. In the near-infrared wavelength range ...

Refaat Tamer F.; Halama Gary E.; DeYoung Russell J.

2000-07-01T23:59:59.000Z

192

Cirrus Classification at Midlatitude from Systematic Lidar Observations  

Science Conference Proceedings (OSTI)

Systematic cirrus lidar measurements performed in the south of France during 2000 are analyzed statistically to search for cloud classes. The classes are based on cloud characteristics (cloud thickness, light backscattering efficiency, and its ...

P. Keckhut; F. Borchi; S. Bekki; A. Hauchecorne; M. SiLaouina

2006-02-01T23:59:59.000Z

193

Lidar Observation of the Atmospheric Boundary Layer in Jerusalem  

Science Conference Proceedings (OSTI)

The temporal variation of the atmospheric boundary layer (ABL) over Jerusalem is accurately measured by means of a lidar system. The findings are explained and discussed based on the specific synoptic situation of typical summer days in the ...

Ram Hashmonay; Ariel Cohen; Uri Dayan

1991-08-01T23:59:59.000Z

194

Lidar Monitoring of the Water Vapor Cycle in the Troposphere  

Science Conference Proceedings (OSTI)

The water vapor mixing ratio distribution in the lower and middle troposphere has been continuously monitored, using an active lidar system. The methodology of the differential absorption laser method used for these measurements is summarized and ...

C. Cahen; G. Megie; P. Flamant

1982-10-01T23:59:59.000Z

195

The NCAR Airborne Infrared Lidar System: Status and Applications  

Science Conference Proceedings (OSTI)

The National Center for Atmospheric Research Airborne Infrared Lidar System is being developed for Doppler wind measurements using heterodyne detection. Its design is based on a pulsed CO2 laser transmitter and a single continuous-wave CO2 laser ...

R. L. Schwiesow; M. P. Spowart

1996-02-01T23:59:59.000Z

196

Light Shift Measurements of Cold Rubidium Atoms using Raman Pump-Probe Spectroscopy.  

E-Print Network (OSTI)

??We have measured light shifts, also known as the A.C. Stark effect, in cold Rubidium atoms using pump-probe spectroscopy. The measurement was made both for… (more)

Souther, Nathan Jon

2009-01-01T23:59:59.000Z

197

ARM - Measurements  

NLE Websites -- All DOE Office Websites (Extended Search)

Select below to highlight measurements in specified measurement categories. Aerosols The effect of aerosols is measured by instrument systems and lidars that provide data...

198

Analysis of LiDAR data for fluvial geomorphic change detection at a small Maryland stream.  

E-Print Network (OSTI)

?? Numerous detailed topographic measurements, which must be periodically repeated, are required to characterize stream bank and channel geometry. Light Detection and Ranging (LiDAR) is… (more)

Gardina, Vincent J.

2009-01-01T23:59:59.000Z

199

A Remotely Operated Lidar for Aerosol, Temperature, and Water Vapor Profiling in the High Arctic  

Science Conference Proceedings (OSTI)

A Rayleigh–Mie–Raman lidar has been installed and is operating in the Polar Environment Atmospheric Research Laboratory at Eureka in the High Arctic (79°59?N, 85°56?W) as part of the Canadian Network for the Detection of Atmospheric Change. The ...

G. J. Nott; T. J. Duck; J. G. Doyle; M. E. W. Coffin; C. Perro; C. P. Thackray; J. R. Drummond; P. F. Fogal; E. McCullough; R. J. Sica

2012-02-01T23:59:59.000Z

200

N13: Raman Spectroscopy?A New Approach to Measure the ...  

Science Conference Proceedings (OSTI)

What Can we Learn from Atomic Scale Calculations of Grain Boundary Properties? What Can We Learn from Measurements of Li-ion Battery Single Particles?

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

NIST Raman facility  

Science Conference Proceedings (OSTI)

... which corresponds to the excitation energy of “Raman ... in software to frequency/intensity, the Raman ... To know determine the energies of the Raman ...

2013-04-05T23:59:59.000Z

202

ARM - Campaign Instrument - co2lidar  

NLE Websites -- All DOE Office Websites (Extended Search)

lidar Comments? We would love to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send Campaign Instrument : Carbon Dioxide Doppler Lidar (CO2LIDAR) Instrument...

203

New topics in coherent anti-stokes raman scattering gas-phase diagnostics : femtosecond rotational CARS and electric-field measurements.  

Science Conference Proceedings (OSTI)

We discuss two recent diagnostic-development efforts in our laboratory: femtosecond pure-rotational Coherent anti-Stokes Raman scattering (CARS) for thermometry and species detection in nitrogen and air, and nanosecond vibrational CARS measurements of electric fields in air. Transient pure-rotational fs-CARS data show the evolution of the rotational Raman polarization in nitrogen and air over the first 20 ps after impulsive pump/Stokes excitation. The Raman-resonant signal strength at long time delays is large, and we additionally observe large time separation between the fs-CARS signatures of nitrogen and oxygen, so that the pure-rotational approach to fs-CARS has promise for simultaneous species and temperature measurements with suppressed nonresonant background. Nanosecond vibrational CARS of nitrogen for electric-field measurements is also demonstrated. In the presence of an electric field, a dipole is induced in the otherwise nonpolar nitrogen molecule, which can be probed with the introduction of strong collinear pump and Stokes fields, resulting in CARS signal radiation in the infrared. The electric-field diagnostic is demonstrated in air, where the strength of the coherent infrared emission and sensitivity our field measurements is quantified, and the scaling of the infrared signal with field strength is verified.

Lempert, Walter R. (Ohio State University, Columbus, OH); Barnat, Edward V.; Kearney, Sean Patrick; Serrano, Justin Raymond

2010-07-01T23:59:59.000Z

204

LIDAR Applications to Wind-Energy Technology Assessment  

Science Conference Proceedings (OSTI)

LIDAR (Light Detection And Ranging) is an emerging technology in the wind industry that has the potential to improve preconstruction wind project development as well as increase reliability and performance of operating projects. Realizing this potential will reduce the cost of wind-power generation. Several LIDAR models have been developed for the wind-energy industry in the past decade as ground-based and nacelle-mounted wind measurement systems. Cost-benefit analyses were conducted for the application ...

2011-11-21T23:59:59.000Z

205

Raman Nanometrology of Graphene  

E-Print Network (OSTI)

13 Optical image of the graphene layers. . . . . .Micro-Raman Spectroscopy of Grapheneand Graphene Multi-Layers . . . . Raman Spectroscopy

Calizo, Irene Gonzales

2009-01-01T23:59:59.000Z

206

EARLINET lidar measurements in Barcelona  

E-Print Network (OSTI)

Summertime re-circulations of air pollutants over the north-eastern Iberian coast observedfrom systematic

Carlos Pe Rez A; Michae L Sicard B; Oriol Jorba A; Adolfo Comero N B; Jose M. Baldasano A

2003-01-01T23:59:59.000Z

207

LiDAR (Laney, 2005) | Open Energy Information  

Open Energy Info (EERE)

LiDAR (Laney, 2005) LiDAR (Laney, 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: LiDAR (Laney, 2005) Exploration Activity Details Location Unspecified Exploration Technique LiDAR Activity Date Usefulness not indicated DOE-funding Unknown Notes Design of Sampling Strategies to Detect CO2 Emissions From Hidden Geothermal Systems, Lewicki, Oldenburg and Kennedy. The objective of this project is to investigate geothermal CO2 monitoring in the near surface as a tool to discover hidden geothermal reservoirs. A primary goal of this project is to develop an approach that places emphasis on cost and time-efficient near-surface exploration methods and yields results to guide and focus more cost-intensive geophysical measurements, installation of

208

Using CO2 Lidar for Standoff Detection of a Perfluorocarbon Tracer in Air  

SciTech Connect

The Tag, Track and Location System Program (TTL) is investigating the use of PFTs as tracers for tagging and tracking items of interest or fallen soldiers. In order for the tagging and tracking to be valuable there must be a location system that can detect the PFTs. This report details the development of an infrared lidar platform for standoff detection of PFTs released into the air from a tagged object or person. Furthering work performed using a table top lidar system in an indoor environment; a mobile mini lidar platform was assembled using an existing Raman lidar platform, a grating tunable CO{sub 2} IR laser, Judson HgCdTe detector and miscellaneous folding optics and electronics. The lidar achieved {approx}200 ppb-m sensitivity in laboratory and indoor testing and was then successfully demonstrated at an outdoor test. The lidar system was able to detect PFTs released into a vehicle from a distance of 100 meters. In its final, fully optimized configuration the lidar was capable of repeatedly detecting PFTs in the air released from tagged vehicles. Responses were immediate and clear. This report details the results of a proof-of-concept demonstration for standoff detection of a perfluorocarbon tracer (PFT) using infrared lidar. The project is part of the Tag, Track and Location System Program and was performed under a contract with Tracer Detection Technology Corp. with funding from the Office of Naval Research. A lidar capable of detecting PFT releases at distance was assembled by modifying an existing Raman lidar platform by incorporating a grating tunable CO{sub 2} IR laser, Judson HgCdTe detector and miscellaneous folding optics and electronics. The lidar achieved {approx}200 ppb-m sensitivity in laboratory and indoor testing and was successfully demonstrated at an outdoor test. The demonstration test (scripted by the sponsor) consisted of three parked cars, two of which were tagged with the PFT. The cars were located 70 (closest) to 100 meters (farthest) from the lidar (the lidar beam path was limited by site constraints and was {approx}100 meters). When one door of each of the cars was opened (sequentially), the lidar was clearly able to determine which vehicles had been tagged and which one was not. The lidar is probably capable of greater than 0.5 kilometer standoff distances based on the extreme amount of signal return achieved (so much that the system had to be de-tuned). The BNL lidar system, while optimized to the extent possible with available parts and budget, was not as sensitive as it could be. Steps to improve the lidar are detailed in this report and include using a better laser system (for more stable power output), dual wavelengths (to improve the sensitivity and allow common mode noise reduction and to allow the use of the lidar in a scanning configuration), heterodyning (for range resolved PFT detection) and an off-axis optical configuration (for improved near field sensitivity).

Heiser,J.H.; Smith, S.; Sedlacek, A.

2008-02-06T23:59:59.000Z

209

Pierre Auger Atmosphere-Monitoring Lidar System  

E-Print Network (OSTI)

The fluorescence-detection techniques of cosmic-ray air-shower experiments require precise knowledge of atmospheric properties to reconstruct air-shower energies. Up to now, the atmosphere in desert-like areas was assumed to be stable enough so that occasional calibration of atmospheric attenuation would suffice to reconstruct shower profiles. However, serious difficulties have been reported in recent fluorescence-detector experiments causing systematic errors in cosmic ray spectra at extreme energies. Therefore, a scanning backscatter lidar system has been constructed for the Pierre Auger Observatory in Malargue, Argentina, where on-line atmospheric monitoring will be performed. One lidar system is already deployed at the Los Leones fluorescence detector site and the second one is currently (April 2003) under construction at the Coihueco site. Next to the established ones, a novel analysis method with assumption on horizontal invariance, using multi-angle measurements is shown to unambiguously measure optical depth, as well as absorption and backscatter coefficient.

A. Filipcic; M. Horvat; D. Veberic; D. Zavrtanik; M. Zavrtanik; M. Chiosso; R. Mussa; G. Sequeiros; M. A. Mostafa; M. D. Roberts

2003-05-21T23:59:59.000Z

210

An Atmospheric Soliton Observed with Doppler Radar, Differential Absorption Lidar, and a Molecular Doppler Lidar  

Science Conference Proceedings (OSTI)

Airborne Leandre II differential absorption lidar (DIAL), S-band dual-polarization Doppler radar (S-Pol), and Goddard Lidar Observatory for Winds (GLOW) Doppler lidar data are used, in conjunction with surface mesonet and special sounding data, ...

Steven E. Koch; Cyrille Flamant; James W. Wilson; Bruce M. Gentry; Brian D. Jamison

2008-08-01T23:59:59.000Z

211

Polarization Lidar at Summit, Greenland for the Detection of Cloud Phase and Particle Orientation  

Science Conference Proceedings (OSTI)

Accurate measurements of cloud properties are necessary to document the full range of cloud conditions and characteristics. The Cloud, Aerosol Polarization and Backscatter Lidar (CAPABL) has been developed to address this need by measuring ...

Ryan R. Neely III; Matthew Hayman; Robert Stillwell; Jeffrey P. Thayer; R. Michael Hardesty; Michael O’Neill; Matthew D. Shupe; Catherine Alvarez

212

Polarization Lidar at Summit, Greenland, for the Detection of Cloud Phase and Particle Orientation  

Science Conference Proceedings (OSTI)

Accurate measurements of cloud properties are necessary to document the full range of cloud conditions and characteristics. The Cloud, Aerosol Polarization and Backscatter Lidar (CAPABL) has been developed to address this need by measuring ...

Ryan R. Neely III; Matthew Hayman; Robert Stillwell; Jeffrey P. Thayer; R. Michael Hardesty; Michael O'Neill; Matthew D. Shupe; Catherine Alvarez

2013-08-01T23:59:59.000Z

213

Comparison of Two Independent LIDAR-Based Pitch Control Designs  

DOE Green Energy (OSTI)

Two different lidar-based feedforward controllers have previously been designed for the NREL 5 MW wind turbine model under separate studies. Feedforward controller A uses a finite-impulse-response design, with 5 seconds of preview, and three rotating lidar measurements. Feedforward controller B uses a static-gain design, with the preview time defined by the pitch actuator dynamics, a simulation of a real nacelle-based scanning lidar system, and a lowpass filter defined by the lidar configuration. These controllers are now directly compared under the same lidar configuration, in terms of fatigue load reduction, rotor speed regulation, and power capture. The various differences in design choices are discussed and compared. We also compare frequency plots of individual pitch feedforward and collective pitch feedforward load reductions, and we see that individual pitch feedforward is effective mainly at the once-per-revolution and twice-per-revolution frequencies. We also explain how to determine the required preview time by breaking it down into separate parts, and we then compare it to the expected preview time available.

Dunne, F.; Schlipf, D.; Pao, L. Y.

2012-08-01T23:59:59.000Z

214

Comparison of Two Independent Lidar-Based Pitch Control Designs  

Science Conference Proceedings (OSTI)

Two different lidar-based feedforward controllers have previously been designed for the NREL 5 MW wind turbine model under separate studies. One uses a finite-impulse-response design, with 5 seconds of preview, and three rotating lidar measurements. The other uses a static-gain design, with the preview time defined by the pitch actuator dynamics, a simulation of a real nacelle-based scanning lidar system, and a lowpass filter defined by the lidar configuration. These controllers are now directly compared under the same lidar configuration, in terms of fatigue load reduction, rotor speed regulation, and power capture. The various differences in design choices are discussed and compared. We also compare frequency plots of individual pitch feedforward and collective pitch feedforward load reductions, and we see that individual pitch feedforward is effective mainly at the once-per-revolution and twice-per-revolution frequencies. We also explain how to determine the required preview time by breaking it down into separate parts, and we then compare it to the expected preview time available.

Dunne, F.; Schlipf, D.; Pao, L. Y.; Wright, A. D.; Jonkman, B.; Kelley, N.; Simley, E.

2012-01-01T23:59:59.000Z

215

Doppler Lidar Observations of a Downslope Windstorm  

Science Conference Proceedings (OSTI)

During January and February 1987, the NOAA/WPL pulsed Doppler lidar was deployed in the foothills west of Boulder, Colorado, to study orographically induced flows over the Continental Divide. On 29 January 1987, the lidar, with its unique spatial ...

Paul J. Neiman; R. M. Hardesty; M. A. Shapiro; R. E. Cupp

1988-11-01T23:59:59.000Z

216

The Lidars in Flat Terrain (LIFT) Experiment  

Science Conference Proceedings (OSTI)

The authors describe and present early results from the July_August 1996 Lidars in Flat Terrain (LIFT) experiment. LIFT was a boundary layer experiment that made use of recently developed Doppler, aerosol backscatter, and ozone lidars, along with ...

Stephen A. Cohn; Shane D. Mayor; Christian J. Grund; Tammy M. Weckwerth; Christoph Senff

1998-07-01T23:59:59.000Z

217

ARM - Campaign Instrument - lidar-dial  

NLE Websites -- All DOE Office Websites (Extended Search)

you Send us a note below or call us at 1-888-ARM-DATA. Send Campaign Instrument : Dial Lidar (LIDAR-DIAL) Instrument Categories Aerosols, Atmospheric Profiling Campaigns ARM-FIRE...

218

A Technique for Autocalibration of Cloud Lidar  

Science Conference Proceedings (OSTI)

In this paper a technique for autocalibration of a cloud lidar is demonstrated. It is shown that the lidar extinction-to-backscatter ratio derived from integrated backscatter for stratocumulus is, in the absence of drizzle, constrained to a ...

Ewan J. O'Connor; Anthony J. Illingworth; Robin J. Hogan

2004-05-01T23:59:59.000Z

219

Calibration Technique for Polarization-Sensitive Lidars  

Science Conference Proceedings (OSTI)

Polarization-sensitive lidars have proven to be highly effective in discriminating between spherical and nonspherical particles in the atmosphere. These lidars use a linearly polarized laser and are equipped with a receiver that can separately ...

J. M. Alvarez; M. A. Vaughan; C. A. Hostetler; W. H. Hunt; D. M. Winker

2006-05-01T23:59:59.000Z

220

Turbine Reliability and Operability Optimization through the use of Direct Detection Lidar Final Technical Report  

SciTech Connect

The goal of this Department of Energy (DOE) project is to increase wind turbine efficiency and reliability with the use of a Light Detection and Ranging (LIDAR) system. The LIDAR provides wind speed and direction data that can be used to help mitigate the fatigue stress on the turbine blades and internal components caused by wind gusts, sub-optimal pointing and reactionary speed or RPM changes. This effort will have a significant impact on the operation and maintenance costs of turbines across the industry. During the course of the project, Michigan Aerospace Corporation (MAC) modified and tested a prototype direct detection wind LIDAR instrument; the resulting LIDAR design considered all aspects of wind turbine LIDAR operation from mounting, assembly, and environmental operating conditions to laser safety. Additionally, in co-operation with our partners, the National Renewable Energy Lab and the Colorado School of Mines, progress was made in LIDAR performance modeling as well as LIDAR feed forward control system modeling and simulation. The results of this investigation showed that using LIDAR measurements to change between baseline and extreme event controllers in a switching architecture can reduce damage equivalent loads on blades and tower, and produce higher mean power output due to fewer overspeed events. This DOE project has led to continued venture capital investment and engagement with leading turbine OEMs, wind farm developers, and wind farm owner/operators.

Johnson, David K; Lewis, Matthew J; ,; Pavlich, Jane C; Wright, Alan D; Johnson, Kathryn E; Pace, Andrew M

2013-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Advanced Lidars for ARM: What Would We Get?  

NLE Websites -- All DOE Office Websites (Extended Search)

CMWG Breakout Session CMWG Breakout Session 2009 ARM Science Team Meeting Advanced Lidars for ARM: What Would We Get? Dave Turner, Ed Eloranta University of Wisconsin - Madison CMWG Breakout Session 2009 ARM Science Team Meeting What is an "Advanced Lidar?" (1) * Ceilometer - Max range ~7km, unpolarized, uncalibrated * Micropulse lidar (MPL) - Sensitive to clouds & aerosols throughout troposphere - Small telescope, rep rate is 1.5 kHz, microjoules of power - Loses sensitivity to cirrus in upper trop during the day - Polarization sensitive - Uncalibrated * Backscatter signals measured by both the MPL and the Ceilometer are convolutions of molecular and particle scattering events - Unable to determine particle extinction without significant assumptions - Main use by ARM has been to determine layer boundaries

222

Small-Footprint Lidar Estimations of Sagebrush Canopy Characteristics  

SciTech Connect

Separating lidar returns for use in determining canopy height and shape in low-height vegetation is difficult because the vegetation canopy return is often close to the ground return in time and space. In addition, height underestimation is likely exacerbated in sparsely vegetated shrub ecosystems. This study compares lidar point-cloud data to sagebrush canopy characteristics measured in the field. It was determined that cumulative prediction error could account for as much as 35.6% of the average height and 37.4% of the average canopy area of shrubs sampled. When scaling from the individual shrub scale to coarser scales, prediction error averaged over a number of shrubs decreases as observation numbers increase. High density (in this case an average of 9.46 returns per m2), small footprint lidar (in this case a footprint diameter of 18 cm at nadir) may provide sufficient accuracy for characterizing sagebrush structure and cover and estimating biomass across landscapes.

Matthew Anderson; Ryan Hruska; Jessica Mitchell; Nancy Glenn

2011-05-01T23:59:59.000Z

223

Efficient method for lossless LIDAR data compression  

Science Conference Proceedings (OSTI)

Light Detection and Ranging (LIDAR) has become one of the prime technologies for rapid collection of vast spatial data, usually stored in a LAS file format (LIDAR data exchange format standard). In this article, a new method for lossless LIDAR LAS file ...

Domen Mongus; Borut Zalik

2011-05-01T23:59:59.000Z

224

Stimulated Raman scattering in large plasmas  

Science Conference Proceedings (OSTI)

Stimulated Raman scattering is of concern to laser fusion since it can create a hot electron environment which can increase the difficulty of achieving high final fuel densities. In earlier experiments with one micron laser light, the energy measured in Raman-scattered light has been insignificant. But these experiments were done with, at most, about 100 joules of laser energy. The Raman instability has a high threshold which also requires a large plasma to be irradiated with a large diameter spot. Only with a long interaction length can the Raman-scattered light wave convectively grow to a large amplitude, and only in recent long pulse, high energy experiments (4000 joules in 2 ns) at the Shiva laser facility have we observed as much as several percent of the laser light to be Raman-scattered. We find that the Raman instability has a much lower intensity threshold for longer laser pulselength and larger laser spot size on a solid target.

Phillion, D.W.; Banner, D.L.

1980-11-06T23:59:59.000Z

225

The Development of Instrumentation and Methods for Measurement of Air-Sea Interaction and Coastal Processes from Manned and Unmanned Aircraft /  

E-Print Network (OSTI)

2 A portable airborne scanning lidar system for ocean and3.4.5 Lidar and imagery . . . . . . . . . . . . . . . . .Figure 2.7: Repeat lidar measurements over the runway of the

Reineman, Benjamin D.

2013-01-01T23:59:59.000Z

226

Performance of Mean-Frequency Estimators for Doppler Radar and Lidar  

Science Conference Proceedings (OSTI)

The performance of mean-frequency estimators for Doppler radar and lidar measurements of winds is presented in terms of two basic parameters: ?, the ratio of the average signal energy per estimate to the spectral noise level; and ?, which is ...

R. G. Frehlich; M. J. Yadlowsky

1994-10-01T23:59:59.000Z

227

Lidar Descriptions of Mixing-Layer Thickness Characteristics in a Complex Terrain/Coastal Environment  

Science Conference Proceedings (OSTI)

Airborne lidar and supplementary measurements made during a major study of air chemistry in southern California (SCCCAMP 1985) provided a rare opportunity to examine atmospheric boundary-layer structure in a coastal area with complex terrain. ...

James L. McElroy; Ted B. Smith

1991-05-01T23:59:59.000Z

228

Potential for a Lidar-Based, Portable, 1 km Meteorological Tower  

Science Conference Proceedings (OSTI)

Lidar measurements of wind, temperature and water vapor, using a variety of techniques that rely on the detection and analysis of laser light backscattered from the atmosphere, allow data to be obtained that are similar to those hypothetically ...

R. L. Schwiesow

1983-05-01T23:59:59.000Z

229

Lidar Determinations of Atmospheric Ice Crystal Layers at South Pole during Clear-Sky Precipitation  

Science Conference Proceedings (OSTI)

Results of lidar measurements of atmospheric ice crystal layers during 36 clear-sky precipitation events at South Pole (2850 m MSL) during the winter over the period March-November 1975 are presented and correlated with ice crystal replicator, ...

Vern N. Smiley; Bruce M. Whitcomb; Bruce M. Morley; Joseph A. Warburton

1980-09-01T23:59:59.000Z

230

Characterization of Aircraft Wake Vortices by 2-?m Pulsed Doppler Lidar  

Science Conference Proceedings (OSTI)

The 2-?m pulsed Doppler lidar, already successfully used for wind and turbulence measurements, has been modified for long-range wake-vortex characterization. In particular, a four-stage data processing algorithm has been developed to achieve ...

Friedrich Köpp; Stephan Rahm; Igor Smalikho

2004-02-01T23:59:59.000Z

231

Variational Analysis for Airborne Conically Scanned Doppler Lidar to Retrieve Mesoscale Wind Fields  

Science Conference Proceedings (OSTI)

An airborne pulsed Doppler lidar implementing a downlooking conical scan rotating around the vertical axis is under development. The information contained in the measured radial velocities is studied to assess the capacity to retrieve the 3D wind ...

Alain Dabas; Julie Périn; Pierre H. Flamant

1997-10-01T23:59:59.000Z

232

Lidar-Based Characterization of the Geometry and Structure of Water Clouds  

Science Conference Proceedings (OSTI)

Lidar remote sensing measurements of low-level water clouds in the form of vertical soundings and instantaneous (1 min) azimuth-over-elevation scans are reported. Retrievals are made of the liquid water content and effective droplet diameter at ...

Luc R. Bissonnette; Gilles Roy; Grégoire Tremblay

2007-08-01T23:59:59.000Z

233

Lidar-Observed Stress Vectors and Veer in the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

We demonstrate that a pulsed wind lidar is a reliable instrument for measuring angles between horizontal vectors of significance in the atmospheric boundary layer. We consider three different angles: the wind turning, the angle between the stress ...

Jacob Berg; Jakob Mann; Edward G. Patton

234

The Multiple Altimeter Beam Experimental Lidar (MABEL): An Airborne Simulator for the ICESat-2 Mission  

Science Conference Proceedings (OSTI)

This paper presents the motivation for, and initial results from, the Multiple Altimeter Beam Experimental lidar (MABEL) instrument. The MABEL instrument provides a new capability for airborne altimetry measurements and serves as a prototype and ...

Matthew McGill; Thorsten Markus; V. Stanley Scott; Thomas Neumann

2013-02-01T23:59:59.000Z

235

In Situ Cloud Sensing with Multiple Scattering Lidar: Design and Validation of an Airborne Sensor  

Science Conference Proceedings (OSTI)

The in situ cloud lidar is designed to measure cloud volumes of millions of cubic meters to overcome the sampling limitations of traditional cloud probes in inhomogeneous clouds. This technique sends laser pulses horizontally from an aircraft ...

K. Franklin Evans; Darren O’Connor; Pat Zmarzly; R. Paul Lawson

2006-08-01T23:59:59.000Z

236

Lidar Observations of Mixed Layer Dynamics: Tests of Parameterized Entrainment Models of Mixed Layer Growth Rate  

Science Conference Proceedings (OSTI)

Ground based lidar measurements of the atmospheric mixed layer depth, the entrainment zone depth and the wind speed and wind direction were used to test various parameterized entrainment models of mixed layer growth rate. Six case studies under ...

R. Boers; E. W. Eloranta; R. L. Coulter

1984-02-01T23:59:59.000Z

237

The CALIPSO Lidar Cloud and Aerosol Discrimination: Version 2 Algorithm and Initial Assessment of Performance  

Science Conference Proceedings (OSTI)

The Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite was launched in April 2006 to provide global vertically resolved measurements of clouds and aerosols. Correct discrimination between clouds and aerosols ...

Zhaoyan Liu; Mark Vaughan; David Winker; Chieko Kittaka; Brian Getzewich; Ralph Kuehn; Ali Omar; Kathleen Powell; Charles Trepte; Chris Hostetler

2009-07-01T23:59:59.000Z

238

Retrieving Winds in the Surface Layer over Land Using an Airborne Doppler Lidar  

Science Conference Proceedings (OSTI)

Airborne Doppler wind lidars are increasingly being used to measure winds in the lower atmosphere at higher spatial resolution than ever before. However, wind retrieval in the range gates closest to the earth’s surface remains problematic. When a ...

K. S. Godwin; S. F. J. De Wekker; G. D. Emmitt

2012-04-01T23:59:59.000Z

239

Wavelet Correlation Transform Method and Gradient Method to Determine Aerosol Layering from Lidar Returns: Some Comments  

Science Conference Proceedings (OSTI)

Identification of aerosol layers on lidar measurements is of interest to determine ranges where aerosol properties are likely to be homogeneous and to infer transport phenomena and atmosphere dynamics. For instance, the range-corrected ...

Adolfo Comerón; Michaël Sicard; Francesc Rocadenbosch

2013-06-01T23:59:59.000Z

240

A Portable Airborne Scanning Lidar System for Ocean and Coastal Applications  

Science Conference Proceedings (OSTI)

A portable compact airborne scanning lidar system based on the Riegl LMS-Q240i has been developed and its functionality demonstrated for oceanographic and coastal measurements. Differential GPS (DGPS) and an inertial navigation system are ...

Benjamin D. Reineman; Luc Lenain; David Castel; W. Kendall Melville

2009-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Removing the Laser-Chirp Influence from Coherent Doppler Lidar Datasets by Two-Dimensional Deconvolution  

Science Conference Proceedings (OSTI)

A chirped laser pulse can introduce artifacts into datasets of coherent Doppler wind lidars. At close vicinity of strong signal peaks undesired artificial velocities can be measured and continuous signals can be shifted by a constant factor. It is ...

Johannes Bühl; Ronny Engelmann; Albert Ansmann

2012-08-01T23:59:59.000Z

242

Lidar-Observed Stress Vectors and Veer in the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

This study demonstrates that a pulsed wind lidar is a reliable instrument for measuring angles between horizontal vectors of significance in the atmospheric boundary layer. Three different angles are considered: the wind turning, the angle between ...

Jacob Berg; Jakob Mann; Edward G. Patton

2013-09-01T23:59:59.000Z

243

Ultraviolet Resonant Raman Enhancements in the Detection of Explosives  

Science Conference Proceedings (OSTI)

Raman-based spectroscopy is potentially militarily useful for standoff detection of high explosives. Normal (non-resonance) and resonance Raman spectroscopies are both light scattering techniques that use a laser to measure the vibrational spectrum of a sample. In resonance Raman, the laser is tuned to match the wavelength of a strong electronic absorbance in the molecule of interest, whereas, in normal Raman the laser is not tuned to any strong electronic absorbance bands. The selection of appropriate excitation wavelengths in resonance Raman can result in a dramatic increase in the Raman scattering efficiency of select band(s) associated with the electronic transition. Other than the excitation wavelength, however, resonance Raman is performed experimentally the same as normal Raman. In these studies, normal and resonance Raman spectral signatures of select solid high explosive (HE) samples and explosive precursors were collected at 785 nm, 244 nm and 229 nm. Solutions of PETN, TNT, and explosive precursors (DNT & PNT) in acetonitrile solvent as an internal Raman standard were quantitatively evaluated using ultraviolet resonance Raman (UVRR) microscopy and normal Raman spectroscopy as a function of power and select excitation wavelengths. Use of an internal standard allowed resonance enhancements to be estimated at 229 nm and 244 nm. Investigations demonstrated that UVRR provided {approx}2000-fold enhancement at 244 nm and {approx}800-fold improvement at 229 nm while PETN showed a maximum of {approx}25-fold at 244 nm and {approx}190-fold enhancement at 229 nm solely from resonance effects when compared to normal Raman measurements. In addition to the observed resonance enhancements, additional Raman signal enhancements are obtained with ultraviolet excitation (i.e., Raman scattering scales as !4 for measurements based on scattered photons). A model, based partly on the resonance Raman enhancement results for HE solutions, is presented for estimating Raman enhancements for solid HE samples.

Short, B J; Carter, J C; Gunter, D; Hovland, P; Jagode, H; Karavanic, K; Marin, G; Mellor-Crummey, J; Moore, S; Norris, B; Oliker, L; Olschanowsky, C; Roth, P C; Schulz, M; Shende, S; Snavely, A; Spear, W

2009-06-03T23:59:59.000Z

244

Observations of Atmospheric Structure and Dynamics in the Owens Valley of California with a Ground-Based, Eye-Safe, Scanning Aerosol Lidar  

Science Conference Proceedings (OSTI)

First results are presented from the deployment of the NCAR Raman-Shifted Eye-Safe Aerosol Lidar (REAL) in the Owens Valley of California during the Terrain-Induced Rotor Experiment (T-REX) in March and April 2006. REAL operated in range–height ...

Stephan F. J. De Wekker; Shane D. Mayor

2009-07-01T23:59:59.000Z

245

Building Extraction Using Lidar Data  

E-Print Network (OSTI)

Accurate 3D surface models in urban areas are essential for a variety of applications, such as visualization, GIS, and mobile communications. Since manual surface reconstruction is very costly and time consuming, the development of automated algorithms is of great importance. On the other hand LIDAR data is a relatively new technology for obtaining Digital Surface Models (DSM) of the earth’s surface. It is a fast method for sampling the earth’s surface with a high density and high point accuracy. In this paper a new approach for building extraction from LIDAR data is presented. The approach utilizes the geometric properties of urban buildings for the reconstruction of the building wire-frames from the LIDAR data. We start by finding the candidate building points that are used to populate a plane parameter space. After filling the plane parameter space, we find the planes that can represent the building roof surfaces. Roof regions are then extracted and the plane parameters are refined using a robust estimation technique and the geometric constraint between adjacent roof facets. The region boundaries are extracted and used to form the building wire-frames. The algorithm is tested on two buildings from a locally acquired LIDAR data sets. The test results show some success in extracting urban area buildings. 1.

Ahmed F. Elaksher; James S. Bethel

2002-01-01T23:59:59.000Z

246

Wide-Angle Imaging Lidar Deployment at the ARM Southern Great Plains Site: Intercomparison of Cloud Property Retrievals  

Science Conference Proceedings (OSTI)

The Wide-Angle Imaging Lidar (WAIL), a new instrument that measures cloud optical and geometrical properties by means of off-beam lidar returns, was deployed as part of a multi-instrument campaign to probe a cloud field at the Atmospheric ...

Igor N. Polonsky; Steven P. Love; Anthony B. Davis

2005-06-01T23:59:59.000Z

247

Design Implications for Laser Raman Measurement Systems for Tritium Sample-Analysis, Accountancy or Process-Control Applications  

Science Conference Proceedings (OSTI)

Measurement, Monitoring, and Accountancy / Proceedings of the Ninth International Conference on Tritium Science and Technology

M. Schlösser; S. Fischer; M. Sturm; B. Bornschein; R. J. Lewis; H. H. Telle

248

Raman studies of organic superconductors.  

SciTech Connect

The temperature-dependence of the frequency of one of the components of the v9 (Ag) doublet in the Raman spectra of several organic superconductors has been measured. The frequency of this mode was observed to soften below 100K, in those compounds in which NMR data indicates antiferromagnetic oscillations in the same temperature range. This is evidence for spin-phonon interactions.

Lin, Y.; Eldridge, J. E.; Wang, H. H.; Kini, A. M.; Schlueter, J. A.; Materials Science Division; Univer. of British Columbia

2001-03-15T23:59:59.000Z

249

Demonstration of a High Pulse Rate Lidar for Studying Airflow  

Science Conference Proceedings (OSTI)

In response to a recognized need for an inexpensive, low power, portable lidar for meteorological applications in remote areas, a system has been designed and constructed. The lidar, termed MELS (Mini-Environmental Lidar System), operates on 20 ...

Thomas G. Kyle; William Clements; Sumner Barr

1985-03-01T23:59:59.000Z

250

Lidar characterization of crystalline silica generation and gravel plant  

E-Print Network (OSTI)

W.E. Eichinger, Elastic Lidar: Theory, Practice and AnalysisApplication of elastic e lidar to PM 10 emissions fromg m ?3 ) QTZ (?g m ?3 ) The lidar horizontal scans collected

Trzepla-Nabaglo, K.; Shiraki, R.; Holm'en, B. A.

2006-01-01T23:59:59.000Z

251

Characterization of a 16-Bit Digitizer for Lidar Data Acquisition  

E-Print Network (OSTI)

A 6-MHz 16-bit waveform digitizer was evaluated for use in atmospheric differential absorption lidar (DIAL) measurements of ozone. The digitizer noise characteristics were evaluated, and actual ozone DIAL atmospheric returns were digitized. This digitizer could replace computer-automated measurement and control (CAMAC)-based commercial digitizers and improve voltage accuracy. Introduction The waveform digitizer is a critical component of lidar detection systems; it transforms the analog detector output into a digital signal by measuring the signal voltage in a discrete time interval determined by an external clock. The accuracy of the digital voltage level increases with the digitizer bit level. Technology has advanced to the point where 8- and 12-bit waveform digitizers are commercially available and commonly used in computer-automated measurement and control (CAMAC) crates, which are readily interfaced to computer systems. These systems have worked well for ground and aircraft-borne...

Cynthia Williamson And; Cynthia K. Williamson; Russell J. De Young

2000-01-01T23:59:59.000Z

252

LiDAR (Lewicki & Oldenburg) | Open Energy Information  

Open Energy Info (EERE)

LiDAR (Lewicki & Oldenburg) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: LiDAR (Lewicki & Oldenburg) Exploration Activity Details Location...

253

LiDAR (Lewicki & Oldenburg, 2005) | Open Energy Information  

Open Energy Info (EERE)

LiDAR (Lewicki & Oldenburg, 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: LiDAR (Lewicki & Oldenburg, 2005) Exploration Activity Details...

254

LiDAR (Lewicki & Oldenburg, 2004) | Open Energy Information  

Open Energy Info (EERE)

LiDAR (Lewicki & Oldenburg, 2004) Exploration Activity Details Location Unspecified Exploration Technique LiDAR Activity Date Usefulness useful DOE-funding Unknown References...

255

New constraints on the processes that control cliff erosion and sediment dispersal using ground-based LIDAR  

E-Print Network (OSTI)

LIDAR using mobile terrestrial LIDAR. Shore and Beach, 75, p. 38-georeference terrestrial LIDAR data to map regional seacliff

Raymond, Jessica Hall

2011-01-01T23:59:59.000Z

256

Lidar remote sensing of pesticide spray drift.  

E-Print Network (OSTI)

??En aquesta tesi doctoral es proposa utilitzar la tècnica LIDAR (Light Detection And Ranging) per estudiar la deriva de pesticides. A diferència dels col·lectors in… (more)

Gregorio López, Eduard

2012-01-01T23:59:59.000Z

257

SABLE: A South Atlantic Aerosol Backscatter Measurement Program  

Science Conference Proceedings (OSTI)

The plans for an atmospheric aerosol field measurement experiment are described. The South Atlantic Backscatter Lidar Experiment (SABLE) is an important step in determining the feasibility of obtaining space-based lidar measurements for the ...

Steven B. Alejandro; George G. Koenig; J. Michael Vaughan; P. Hywel Davies

1990-03-01T23:59:59.000Z

258

In Situ Samplings and Remote Sensing Measurements to Characterize Aerosol Properties over Southeast Italy  

Science Conference Proceedings (OSTI)

Ground-based particulate matter (PM) samplers, an XeF Raman lidar operating in the framework of the European Aerosol Research Lidar Network (EARLINET), and a sun/sky radiometer operating in the framework of the Aerosol Robotic Network (AERONET) ...

V. Bellantone; I. Carofalo; F. De Tomasi; M. R. Perrone; M. Santese; A. M. Tafuro; A. Turnone

2008-08-01T23:59:59.000Z

259

Aerosol plume transport and transformation in high spectral resolution lidar measurements and WRF-Flexpart simulations during the MILAGRO Field Campaign  

E-Print Network (OSTI)

The Mexico City Metropolitan Area (MCMA) experiences high loadings of atmospheric aerosols from anthropogenic sources, biomass burning and wind-blown dust. This paper uses a combination of measurements and numerical ...

de Foy, B.

260

Laser Raman scattering measurements of differential molecular diffusion in turbulent nonpremixed jet flames of H{sub 2}/CO{sub 2} fuel  

DOE Green Energy (OSTI)

This paper explores effects of differential diffusion in nonpremixed turbulent jet flames. Pulsed Raman scattering spectroscopy is used to measure temperature and species concentrations in chemically reacting jets of H{sub 2}/CO{sub 2} into air, over a range of jet Reynolds numbers from 1,000 to 30,000 based on cold jet fluid properties. Results show significant effects of differential diffusion at all jet Reynolds numbers considered. Differential diffusion between H{sub 2} and C0{sub 2} produces differences between the hydrogen element mixture fraction ({xi}{sub H}) and the carbon element mixture fraction ({xi}{sub c}). The greatest effects occur on the rich side of stoichiometric, where {xi}{sub H} is observed to be smaller than {xi}{sub C} at all Reynolds numbers. Differential diffusion between H{sub 2} and H{sub 2}O creates a net flux of hydrogen element toward the stoichiometric contour and causes a local maximum in {xi}H that occurs near the stoichiometric condition. A differential diffusion variable {sup Z}H is defined as the difference between {xi}{sub H} and {xi}{sub C}. The variance Of {sup Z}H conditional on {xi}{sub C} also shows that differential diffusion effects are greatest on the rich side of the flame. Conditional variances of {sup Z}H are largest at intermediate Reynolds numbers.

Smith, L.L.; Dibble, R.W.; Talbot, L. [California Univ., Berkeley, CA (United States). Dept. of Mechanical Engineering; Barlow, R.S.; Carter, C.D. [Sandia National Labs., Livermore, CA (United States)

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

THE AUTOMATIC EXTRACTION OF ROADS FROM LIDAR DATA Simon CLODEa  

E-Print Network (OSTI)

. and Kubic, K., 2003. Building dectection using LIDAR data and multi- spectral images. In: Proceedings

Salvaggio, Carl

262

2D LIDAR Aided INS for Vehicle Positioning in Urban Environments  

E-Print Network (OSTI)

residual formation and EKF LIDAR aiding methods. Section VIintensity. Utilization of 2D LIDAR in localization has a2D LIDAR Aided INS for Vehicle Positioning in Urban

Zhao, Sheng; Farrell, Jay A.

2013-01-01T23:59:59.000Z

263

The 27–28 October 1986 FIRE IFO Cirrus Case Study: A Five Lidar Overview of Cloud Structure and Evolution  

Science Conference Proceedings (OSTI)

Optical remote sensing measurements of cirrus cloud properties were collected by one airborne and four ground-based lidar systems over a 32-h period during this cue study from the First ISCCP (International Satellite Cloud Climatology Program) ...

Kenneth Sassen; Christian J. Grund; James D. Spinhirne; Michael M. Hardesty; Jose M. Alvarez

1990-11-01T23:59:59.000Z

264

Development and Application of a Compact, Tunable, Solid-State Airborne Ozone Lidar System for Boundary Layer Profiling  

Science Conference Proceedings (OSTI)

The National Oceanic and Atmospheric Administration/Earth System Research Laboratory/Chemical Sciences Division (NOAA/ESRL/CSD) has developed a versatile, airborne lidar system for measuring ozone and aerosols in the boundary layer and lower free ...

R. J. Alvarez II; C. J. Senff; A. O. Langford; A. M. Weickmann; D. C. Law; J. L. Machol; D. A. Merritt; R. D. Marchbanks; S. P. Sandberg; W. A. Brewer; R. M. Hardesty; R. M. Banta

2011-10-01T23:59:59.000Z

265

The 27–28 October 1986 FIRE IFO Cirrus Case Study: Cloud Optical Properties Determined by High Spectral Resolution Lidar  

Science Conference Proceedings (OSTI)

During the FIRE cirrus IFO, the High Spectral Resolution Lidar (HSRL) was operated from a roof top site on the University of Wisconsin–Madison campus. Because the HSRL technique separately measures the molecular and cloud particle backscatter ...

C. J. Grund; E. W. Eloranta

1990-11-01T23:59:59.000Z

266

Exploitation of resonance Raman spectroscopy as a remote chemical sensor  

SciTech Connect

We have discussed recent experimental results using a resonance-Raman-based LIDAR system as a remote chemical sensor. This spectroscopy has the fundamental advantage that it is based on optical fingerprints that are insensitive to environmental perturbations. By taking advantage of resonance enhancement, which 6 orders-of-magnitude, can be as large as 4 to an increased sensing range for a given chemical concentration or lower detection limit for a given stand-off distance can be realized. The success discussed above can in part be traced back to the use of new state-of-the-art technologies which, only recently, have allowed the phenomenon of resonance-enhanced Raman spectroscopy to be fully exploited as a remote chemical sensor platform. Since many chemicals have electronic transitions in the UV/IS, it is expected that many will have pronounced resonance enhancements.

Sedlacek, A.J.; Chen, C.L.

1995-08-01T23:59:59.000Z

267

Supervised Parametric Classification of Aerial LiDAR Data  

E-Print Network (OSTI)

In this work, we classify 3D aerial LiDAR height data into roads, grass, buildings, and trees using a supervised parametric classification algorithm. Since the terrain is highly undulating, we subtract the terrain elevations using digital elevation models (DEMs, easily available from the United States Geological Survey (USGS)) to obtain the height of objects from a flat level. In addition to this height information, we use height texture (variation in height), intensity (amplitude of lidar response), and multiple (two) returns from lidar to classify the data. Furthermore, we have used luminance (measured in the visible spectrum) from aerial imagery as the fifth feature for classification. We have used mixture of Gaussian models for modeling the training data. Model parameters and the posterior probabilities are estimated using Expectation-Maximization (EM) algorithm. We have experimented with different number of components per model and found that four components per model yield satisfactory results. We have tested the results using leaveone -out as well as random test. Classification results are in the range of 66% -- 84% depending upon the combination of features used that compares very favorably with. trainall -test-all results of 85%. Further improvement is achieved using spatial coherence.

Amin P. Charaniya; Roberto Manduchi; Roberto M; Suresh K. Lodha

2004-01-01T23:59:59.000Z

268

Enhanced LIDAR Improves Range, Vibration Measures  

Science Conference Proceedings (OSTI)

... Scientists at the National Institute of Standards and Technology (NIST) have demonstrated the use of an ultrafast laser “frequency comb” system for ...

2013-08-07T23:59:59.000Z

269

CALIPSO Lidar Description and Performance Assessment  

Science Conference Proceedings (OSTI)

This paper provides background material for a collection of Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) algorithm papers that are to be published in the Journal of Atmospheric and Oceanic Technology. It provides a brief description ...

William H. Hunt; David M. Winker; Mark A. Vaughan; Kathleen A. Powell; Patricia L. Lucker; Carl Weimer

2009-07-01T23:59:59.000Z

270

Systematic Sampling of Scanning Lidar Swaths  

E-Print Network (OSTI)

Proof of concept lidar research has, to date, examined wall-to-wall models of forest ecosystems. While these studies have been important for verifying lidars efficacy for forest surveys, complete coverage is likely not the most cost effective means of using lidar as auxiliary data for operational surveys; sampling of some sort being the better alternative. This study examines the effectiveness of sampling with high point-density scanning lidar data and shows that systematic sampling is a better alternative to simple random sampling. It examines the bias and mean squared error of various estimators, and concludes that a linear-trend-based and especially an autocorrelation-assisted variance estimator perform better than the commonly used simple random sampling based-estimator when sampling is systematic.

Marcell, Wesley Tyler

2009-12-01T23:59:59.000Z

271

3D building reconstruction from LIDAR data  

Science Conference Proceedings (OSTI)

As a fast data acquisition technique, Light Detection and Ranging (LIDAR) can be widely used in many applications, such as visualization, GIS and mobile communication. Since manual surface reconstruction is very costly and time consuming, the development ...

Yuan Luo; Marina L. Gavrilova

2006-05-01T23:59:59.000Z

272

A tomographic framework for LIDAR imaging  

Science Conference Proceedings (OSTI)

Detection and localization of underwater mines remains a challenging and important problem for safe operation of naval platforms. A number of new technologies exploit airborne LIDARs, which can penetrate the air-water interface and optically detect and ...

P. J. Shargo; N. Cadalli; A. C. Singer

2001-05-01T23:59:59.000Z

273

ARM - Field Campaign - Aerosol Lidar Validation Experiment -...  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaignsAerosol Lidar Validation Experiment - ALIVE Campaign Links ALIVE Website Comments? We would love to hear from you Send us a note below or call us at 1-888-ARM-DATA....

274

ABLE: Development of an Airborne Lidar  

Science Conference Proceedings (OSTI)

The acronym ABLE (Airborne Lidar Experiment) identifies a project to develop and fly an optical radar on a stratospheric platform for studies related to atmospheric radiation and composition. The prototype, ABLE 1, has been successfully flown on ...

Giorgio Fiocco; Paolo G. Calisse; Marco Cacciani; Stefano Casadio; Giandomenico Pace; Daniele Fua

1999-10-01T23:59:59.000Z

275

Aerosol properties computed from aircraft-based observations during the ACE-Asia campaign: 2. A case study of lidar ratio closure  

SciTech Connect

For a vertical profile with three distinct layers (marine boundary, pollution and dust layers), observed during the ACE-Asia campaign, we carried out a comparison between the modeled lidar ratio vertical profile and that obtained from co-located airborne NASA AATS-14 sunphotometer and shipborne Micro-Pulse Lidar (MPL) measurements. The vertically resolved lidar ratio was calculated from two size distribution vertical profiles – one obtained by inversion of sunphotometer-derived extinction spectra, and one measured in-situ – combined with the same refractive index model based on aerosol chemical composition. The aerosol model implies single scattering albedos of 0.78 – 0.81 and 0.93 – 0.96 at 0.523 ?m (the wavelength of the lidar measurements), in the pollution and dust layers, respectively. The lidar ratios calculated from the two size distribution profiles agree closely in the dust layer; they are however, significantly lower than the lidar ratios derived from combined lidar and sunphotometer measurements. Uncertainties in aerosol size distributions and refractive index only partly explain these differences, suggesting that particle nonsphericity in this layer is an additional explanation. In the pollution layer, the two size distribution profiles yield lidar ratios that agree within the estimated uncertainties. The retrieved size distributions result in a lidar ratio which is in closer agreement with that derived from lidar/sunphotometer measurements in this layer, with still large differences at certain altitudes (the largest relative difference was 46%). We explain these differences by non-uniqueness of the result of the size distribution retrieval, by a lack of information on the mixing state of particles, and the vertical variability of the particle refractive index.

Kuzmanoski, Maja; Box, M. A.; Schmid, Beat; Box, G. P.; Wang, Jian; Russel, P. R.; Bates, D.; Jonsson, Haf; Welton, E. J.; Seinfeld, J. H.

2007-04-03T23:59:59.000Z

276

Microsoft PowerPoint - ferrare_STM_2009_poster [Compatibility...  

NLE Websites -- All DOE Office Websites (Extended Search)

clouds? H th i ti l t d t h i Approach * Use combination of advanced ground (SGP Raman Lidar) and airborne (NASALaRC HSRL) lidars and * Lidar measurements show increases in...

277

Scanning Lidar Based Atmospheric Monitoring for Fluorescent Detectors of Cosmic Showers  

E-Print Network (OSTI)

Measurements of the cosmic-ray air-shower fluorescence at extreme energies require precise knowledge of atmospheric conditions. The absolute calibration of the cosmic-ray energy depends on the absorption of fluorescence light between its origin and point of its detection. To reconstruct basic atmospheric parameters we review a novel analysis method based on two- and multi-angle measurements performed by the scanning backscatter lidar system. Applied inversion methods, optical depth, absorption and backscatter coefficient, as well as other parameters that enter the lidar equation are discussed in connection to the attenuation of the light traveling from shower to fluorescence detector.

A. Filipcic; M. Horvat; D. Veberic; D. Zavrtanik; M. Zavrtanik

2002-02-06T23:59:59.000Z

278

PHOTOGRAMMETRIC MODEL ORIENTATION USING LIDAR DATASET  

E-Print Network (OSTI)

Today the LIDAR dataset is a powerful alternative to be applied in the optimization of photogrammetric mapping techniques. The complementary nature of LIDAR and photogrammetry allows for the optimal performance of many applications to extract 3D spatial information. For example, photogrammetry image permits accurate borders building extraction. In addition, LIDAR provides a number of accurate 3D points that describe some information about physical building surfaces. These properties show the possibility of combining data from both sensors to arrive at a more robust and complete reconstruction of 3D objects in many applications such as monoplotting, orthophoto generation, surface reconstruction, etc. Photogrammetric procedures need the exterior parameters of images (EOP) for extracting mapping information. Despite of the availability of GPS/INS systems, which greatly assist in direct geo-referencing of the acquired imagery, the majority of commercial available photogrammetric system needs control information to perform photogrammetric mapping techniques. Regarding the accuracy improvement of LIDAR systems in the recent years, LIDAR data is considered a viable supply of photogrammetric control. This paper presents a methodology for using the centroids of building roof as control points in photogrammetric model orientation. The centroid is equivalent to a single control point with 3D coordinates allowing its use in traditional photogrammetric systems. In the experiments performed, the obtained results confirmed the feasibility of the proposed methodology to be applied in geo-referencing of photogrammetric images using LIDAR dataset.

E. Mitishita; A. Habib; A. Machado

2008-01-01T23:59:59.000Z

279

The CALIPSO Automated Aerosol Classification and Lidar Ratio Selection Algorithm  

Science Conference Proceedings (OSTI)

Descriptions are provided of the aerosol classification algorithms and the extinction-to-backscatter ratio (lidar ratio) selection schemes for the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) aerosol products. One ...

Ali H. Omar; David M. Winker; Mark A. Vaughan; Yongxiang Hu; Charles R. Trepte; Richard A. Ferrare; Kam-Pui Lee; Chris A. Hostetler; Chieko Kittaka; Raymond R. Rogers; Ralph E. Kuehn; Zhaoyan Liu

2009-10-01T23:59:59.000Z

280

DTM Generation from LIDAR Data using Skewness Balancing  

Science Conference Proceedings (OSTI)

LIght Detection And Ranging (LIDAR) data for terrain and land surveying has contributed to many environmental, engineering and civil applications. However, the analysis of Digital Surface Models (DSMs) from complex LIDAR data is still challenging. Commonly, ...

Marc Bartels; Hong Wei; David C. Mason

2006-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

The utility of LiDAR for landscape biodiversity assessment.  

E-Print Network (OSTI)

??The potential of LiDAR to inform landscape biodiversity assessments is investigated. The objectives of this research are to examine how LiDAR discrete return and full… (more)

Miura, N

2010-01-01T23:59:59.000Z

282

Two wavelength Lidar instrument for atmospheric aerosol study.  

E-Print Network (OSTI)

??A two-color lidar instrument and inversion algorithms have been developed for the study of atmospheric aerosols. The two-color lidar laser transmitter is based on the… (more)

Hoffman, David Swick.

2008-01-01T23:59:59.000Z

283

Low Wind Speed Technology Phase II: LIDAR for Turbine Control  

SciTech Connect

This fact sheet describes NREL's subcontract with QinetiQ to conduct a study on LIDAR systems for wind turbines.

Not Available

2006-06-01T23:59:59.000Z

284

A Comparison of Cirrus Cloud Visible Optical Depth Derived from Lidar  

NLE Websites -- All DOE Office Websites (Extended Search)

Comparison of Cirrus Cloud Visible Optical Depth Derived from Lidar Comparison of Cirrus Cloud Visible Optical Depth Derived from Lidar Lo, Chaomei Pacific Northwest National Laboratory Comstock, Jennifer Pacific Northwest National Laboratory Flynn, Connor Pacific Northwest National Laboratory Category: Cloud Properties Optically thin clouds (e.g. optical depth < 3) can have a significant impact on radiative heating in the atmosphere, particularly in the cold upper troposphere. Currently, there is no value-added product (VAP) in the Atmospheric Radiation Measurement (ARM) program archive that produces thin cloud optical depth, particularly at the Tropical Western Pacific and North Slope of Alaska sites. A VAP is under development to obtain the cirrus cloud visible optical depth from the MPLNOR (Micro Pulse Lidar Normalized

285

Remote control and telescope auto-alignment system for multiangle LIDAR under development at CEILAP, Argentina  

E-Print Network (OSTI)

At CEILAP (CITEDEF-CONICET), a multiangle LIDAR is under development to monitor aerosol extinction coefficients in the frame of the CTA (Cherenkov Telescope Array) Project. This is an initiative to build the next generation of ground-based instruments to collect very high energy gamma-ray radiation (>10 GeV). The atmospheric conditions are very important for CTA observations, and LIDARs play an important role in the measurement of the aerosol optical depth at any direction. The LIDAR being developed at CEILAP was conceived to operate in harsh environmental conditions during the shifts, and these working conditions may produce misalignments. To minimize these effects, the telescopes comprising the reception unit are controlled by a self-alignment system. This paper describes the self-alignment method and hardware automation.

Pallotta, Juan; Otero, Lidia; Chouza, Fernando; Raul, Delia; Gonzalez, Francisco; Etchegoyen, Alberto; Quel, Eduardo

2013-01-01T23:59:59.000Z

286

EN-025 Tools & Applications December 2008 Lidar Remote Sensing  

E-Print Network (OSTI)

EN-025 Tools & Applications December 2008 Lidar Remote Sensing: Mapping British Columbia's Forests with Lasers By Christopher W. Bater, Denis Collins, and Nicholas C. Coops KEYWORDS: remote sensing, lidar. Collins, and N.C. Coops. 2008. Lidar remote sensing: mapping British Columbia's forests with lasers

287

A Method for Noise Removal of LIDAR Point Clouds  

Science Conference Proceedings (OSTI)

LiDAR can quickly and accurately obtain precision and high-density surface elevation data. In cooperation with high-precision GPS positioning technology and IMU attitude sensor, a typical noise removal algorithm of LIDAR point clouds based on FEA is ... Keywords: LIDAR, point clouds, noise removal, FEA

Huang Zuowei, Huang Yuanjiang, Huang Jie

2013-01-01T23:59:59.000Z

288

Detection and Quantitative Analysis of Chemical Species in Hanford Tank Materials Using Raman Spectroscopy Technology: FY94Florida State University Raman Spectroscopy Report  

Science Conference Proceedings (OSTI)

This report provides a summary of work completed in FY-94 by FSU to develop and investigate the feasibility of using Raman spectroscopy with Hanford tank waste materials. Raman performance impacts from sample morphology, including the effects of absorption, particle size, density, color and refractive index, are discussed. An algorithm for relative species concentration measurement from Raman data is presented. An Algorithm for applying Raman to tank waste core screening is presented and discussed. A library of absorption and Raman spectra are presented that support this work.

Reich, F.R.

1997-08-11T23:59:59.000Z

289

Three-Dimensional Wind Retrieval: Application of MUSCAT to Dual-Doppler Lidar  

Science Conference Proceedings (OSTI)

During the field campaign of the Terrain-induced Rotor Experiment (T-REX) in the spring of 2006, Doppler lidar measurements were taken in the complex terrain of the Californian Owens Valley for six weeks. While fast three-dimensional (3D) wind ...

Susanne Drechsel; Georg J. Mayr; Michel Chong; Martin Weissmann; Andreas Dörnbrack; Ronald Calhoun

2009-03-01T23:59:59.000Z

290

Improving Retrievals of Cirrus Cloud Particle Size Coupling Lidar and Three-Channel Radiometric Techniques  

Science Conference Proceedings (OSTI)

This study is intended to illustrate the potential advantage of combining lidar measurements and the split-window technique based on the infrared spectral information contained at the 8.65-, 11.15-, and 12.05-?m bands for inferring the ...

M. Chiriaco; H. Chepfer; V. Noel; A. Delaval; M. Haeffelin; P. Dubuisson; P. Yang

2004-07-01T23:59:59.000Z

291

An Analysis of the Performance of the UFAM Pulsed Doppler Lidar for Observing the Boundary Layer  

Science Conference Proceedings (OSTI)

The performance of the 1.5-?m pulsed Doppler lidar, operated by the U.K. Universities Facility for Atmospheric Measurement (UFAM) over a 51-day continuous and unattended field deployment in southern England, is described and analyzed with a view ...

Guy Pearson; Fay Davies; Chris Collier

2009-02-01T23:59:59.000Z

292

Rayleigh Lidar Observations of Gravity Wave Activity in the Upper Stratosphere at Urbana, Illinois  

Science Conference Proceedings (OSTI)

During 13 nights of Rayleigh lidar measurements at Urbana Illinois in 1984–86, thirty-six quasi-monochromatic gravity waves were observed in the 35–50 km altitude region of the stratosphere. The characteristics of the waves are compared with ...

Chester S. Gardner; Marcus S. Miller; C. H. Liu

1989-06-01T23:59:59.000Z

293

A Space-Based Point Design for Global Coherent Doppler Wind Lidar  

E-Print Network (OSTI)

An end-to-end point design, including lidar, orbit, scanning, atmospheric, and data processing parameters, for space-based global profiling of atmospheric wind will be presented. The point design attempts to match the recent NASA/NOAA draft science requirements for wind measurement.

Profiling Matched To; Michael J. Kavaya; G. David Emmitt; Rod G. Frehlich; Farzin Amzajerdian; Upendra N. Singh

2002-01-01T23:59:59.000Z

294

LiDAR | Open Energy Information  

Open Energy Info (EERE)

LiDAR LiDAR Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: LiDAR Details Activities (10) Areas (5) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Remote Sensing Techniques Exploration Sub Group: Active Sensors Parent Exploration Technique: Active Sensors Information Provided by Technique Lithology: Stratigraphic/Structural: delineate faults, create high-resolution DEMS, quantify fault kinemaics, develop lineament maps Hydrological: Thermal: Cost Information Low-End Estimate (USD): 300.0030,000 centUSD 0.3 kUSD 3.0e-4 MUSD 3.0e-7 TUSD / sq. mile Median Estimate (USD): 850.0085,000 centUSD 0.85 kUSD 8.5e-4 MUSD 8.5e-7 TUSD / sq. mile High-End Estimate (USD): 1,300.00130,000 centUSD 1.3 kUSD 0.0013 MUSD 1.3e-6 TUSD / sq. mile

295

Lidar Network Observations of Cirrus Morphological and Scattering Properties during the International Cirrus Experiment 1989: The 18 October 1989 Case Study and Statistical Analysis  

Science Conference Proceedings (OSTI)

Four lidars located roughly 75 km from each other in the inner German Bight of the North Sea, were used to measure geometrical and optical properties of cirrus clouds during the International Cirrus Experiment 1989 (ICE '89). A complete cirrus ...

Albert Ansmann; Jens Bösenberg; Gérard Brogniez; Salem Elouragini; Pierre H. Flamant; Karlheinz Klapheck; Holger Linn; Louis Menenger; Walfried Michaelis; Maren Riebesell; Christoph Senff; Pierre-Yves Thro; Ulla Wandinger; Claus Weitkamp

1993-10-01T23:59:59.000Z

296

Model of the Correlation between Lidar Systems and Wind Turbines for Lidar Assisted Control  

Science Conference Proceedings (OSTI)

Investigations of lidar-assisted control to optimize the energy yield and to reduce loads of wind turbines have increased significantly in recent years. For this kind of control it is crucial to know the correlation between the rotor effective ...

David Schlipf; Po Wen Cheng; Jakob Mann

297

International School on LiDAR Technology Laboratory Manual for LiDAR Data Processing  

E-Print Network (OSTI)

impart hands-on-training on working with LiDAR data. A duration of 12 hours has been assigned for data processing, which is spread over four days during the school. The laboratoryisplannedtobeconductedattheComputerCentreofIITKanpurwhereeach participant would be able to learn on his/her own. The LiDAR data processing exercises have been designed around the TerraSolid software (Terrascan, Terramatch, Terramodeller and Terraphoto). This manual consists of detailed instructions for LiDAR data processing. The instructions have been divided into four parts. The first part deals with importing raw LiDAR data and trajectory within Terrascan, creation of projects and different kinds of visualizations. In the second part, LiDAR data are corrected for the inherent errors using the overlap analysis. The corrected data are passed into the classification process which is covered in the third part of the manual. The use of routines and macros is shown to classify LiDAR data into ground points, low points, below surface points, building points etc. At this stage anorthophotograph is also employed to help in the classification process. Finally, the fourth part of laboratory manual shows how to generate vector models for

Bapna Ravish; Ghosh Suddhasheel; Biswas Susham; Y Surya Aditya

2008-01-01T23:59:59.000Z

298

Raman Spectroscopy of High Thermal Conductivity AlN Ceramics ...  

Science Conference Proceedings (OSTI)

Thermal conductivity of AlN ceramics was measured by laser flash method. Raman spectroscopy was used to characterize oxygen related defects of AlN ... Transport in Co-Based Materials for Fuel Cells and Oxygen Separation Membranes.

299

Scanning 6-Wavelength 11-Channel Aerosol Lidar  

Science Conference Proceedings (OSTI)

A transportable multiple-wavelength lidar is presented, which is used for the profiling of optical and physical aerosol properties. Two Nd:YAG and two dye lasers in combination with frequency-doubling crystals emit simultaneously at 355, 400, 532,...

Dietrich Althausen; Detlef Müller; Albert Ansmann; Ulla Wandinger; Helgard Hube; Ernst Clauder; Steffen Zörner

2000-11-01T23:59:59.000Z

300

Reconstructing 3D buildings from Lidar data  

E-Print Network (OSTI)

Accurate 3D surface models in urban areas are essential for a variety of applications, such as visualization, GIS, and mobile communications. Since manual surface reconstruction is very costly and time consuming, the development of automated algorithms is of great importance. On the other hand LIDAR data is a relatively new technology for obtaining Digital Surface Models (DSM) of the earth’s surface. It is a fast method for sampling the earth’s surface with a high density and high point accuracy. In this paper a new approach for building extraction from LIDAR data is presented. The approach utilizes the geometric properties of urban buildings for the reconstruction of the building wire-frames from the LIDAR data. We start by finding the candidate building points that are used to populate a plane parameter space. After filling the plane parameter space, we find the planes that can represent the building roof surfaces. Roof regions are then extracted and the plane parameters are refined using a robust estimation technique and the geometric constraint between adjacent roof facets. The region boundaries are extracted and used to form the building wireframes. The algorithm is tested on two buildings from a locally acquired LIDAR data sets. The test results show some success in extracting urban area buildings. 1.

Ahmed F. Elaksher; James S. Bethel

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Simulation of Lidar Return Signals Associated with Water Clouds  

E-Print Network (OSTI)

We revisited an empirical relationship between the integrated volume depolar- ization ratio, oacc, and the effective multiple scattering factor, -n, on the basis of Monte Carlo simulations of spaceborne lidar backscatter associated with homogeneous wa- ter clouds. The relationship is found to be sensitive to the extinction coefficient and to the particle size. The layer integrated attenuated backscatter is also obtained. Comparisons made between the simulations and statistics derived relationships of the layer integrated depolarization ratio, oacc, and the layer integrated attenuated backscatter, -n, based on the measurement by the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite show that a cloud with a large effective size or a large extinction coefficient has a relatively large integrated backscatter and a cloud with a small effective size or a large extinction coefficient has a large integrated volume depolarization ratio. The present results also show that optically thin water clouds may not obey the empirical relationship derived by Y. X. Hu. and co-authors.

Lu, Jianxu

2009-08-01T23:59:59.000Z

302

Water vapor from sunradiometry in comparison with microwave and balloon-sonde measurements at the Southern Great Plains ARM Site  

SciTech Connect

Water vapor plays a fundamental role in weather and climate. It is the most important greenhouse gas and the most variable in space and time. The DOE Atmospheric Radiation Measurement program is devoting a large fraction of its resources for the accurate characterization of the column abundance and the distribution of water vapor with altitude. Balloon sondes, microwave radiometers, and Raman lidars are the major instruments either currently in use or under consideration for these tasks. Although the Multi-Filter Rotating Shadowband Radiometer (MFRSR) is primarily intended for use in accurate measurements of spectral short-wave radiation and in the measurement of spectral extinction by aerosol, it has the potential to measure total column water vapor as well. In this paper the authors report on a preliminary investigation of the MFRSR`s capabilities with regard to accurate measurements of total column water vapor at times when there is a clear path to the sun, i.e., cloudless conditions.

Michalsky, J.J.; Harrison, L.C. [State Univ. of New York, Albany, NY (United States). Atmospheric Sciences Research Center; Liljegren, J.C. [Pacific Northwest Lab., Richland, WA (United States)

1994-01-01T23:59:59.000Z

303

LIDAR, Camera and Inertial Sensors Based Navigation Techniques for Advanced Intelligent Transportation System Applications  

E-Print Network (OSTI)

in the vision sensor and LIDAR system development makes thisvehicle carries one camera and two IBEO ALASCA XT LIDARLIDARs. (a) SICK LMS200 LIDAR, (b) HOKUYO UXM-30LN LIDAR, (

Huang, Lili

2010-01-01T23:59:59.000Z

304

Rapid Determination of Near-Fault Earthquake Deformation Using Differential LiDAR  

E-Print Network (OSTI)

GeoEarthScope Airborne LiDAR and Satellite InSAR Imagery,2003). Northern California LIDAR Data: A Tool for MappingSurvey-scale airborne lidar error analysis from parallel

Borsa, Adrian Antal; Minster, Jean Bernard

2012-01-01T23:59:59.000Z

305

Clouds Height and Aerosol Dynamic Monitoring by Micro Pulse Backscattering Eye-safe Lidar  

E-Print Network (OSTI)

Real-time, clouds height monitoring, attenuation length measurement and remote atmospheric homogeneity sensing by micro pulse Lidar (MPL) is proposed for use together with UV-laser slant-path extinction measurements in the Pierre Auger experiment. The goal of the research reported here is to determine the feasibility of such a sensor for quatitative measurements during an experiment in autonomous mode regardless of weather. Preliminary results of an atmosphere sensing at the Pierre Auger site in Nov.1998 by micro pulse Lidar are presented and discussed. 1 Introduction The long term measurements of the atmospheric turbidity, meteovisibility, haze optical thickness and cloud base height are very important for the surface radiation budget and for climate modeling in general. These data are necessary both, for scientic use, as in the detection of extremely high energy cosmic rays by the uorescence technique [1], and for applied environmental monitoring, as in air trac control for...

Pershin And Lyash

1999-01-01T23:59:59.000Z

306

Assessing Available Woody Plant Biomass on Rangelands with Lidar and Multispectral Remote Sensing  

E-Print Network (OSTI)

The majority of biofuels are produced from corn and grain. The drawback to these sources of biofuels is the vast amount of cultivated land needed to produce substantial amounts of biofuel, potentially increasing the price of food and livestock products. Mesquite trees, a type of woody plant, are a proven source of bioenergy feedstock found on semi-arid lands. The overall objectives of this study were to develop algorithms for determining woody plant biomass on rangelands in Texas at plot-level using terrestrial lidar and at the local scale by integrating reference biomass and multispectral imagery. Terrestrial lidar offers a more efficient method for estimating biomass than traditional field measurements. Variables from the terrestrial lidar point cloud were compared to ground measurements of biomass to find a best fitting regression model. Two processing methods were investigated for analyzing the lidar point cloud data, namely: 1) percentile height statistics and 2) a height bin approach. Regression models were developed for variables obtained through each processing technique for estimating woody plant, above-ground biomass. Regression models were able to explain 81 percent and 77 percent of the variance associated with the aboveground biomass using percentile height statistics and height bins, respectively. The aboveground biomass map was generated by using the cokriging interpolation method with NDVI and ground biomass data. According to cross-validation, ordinary cokriging estimated biomass accurately (R^2 = 0.99). The results of this study revealed that terrestrial lidar can be used to accurately and efficiently estimate the aboveground biomass of mesquite trees in a semi-arid environment at plot level. Moreover, spatial interpolation techniques proved useful in scaling up biomass estimates to local scale.

Ku, Nian-Wei

2011-05-01T23:59:59.000Z

307

Polarized Micro Pulse Lidars R. L. Coulter and T. J. Martin  

NLE Websites -- All DOE Office Websites (Extended Search)

and Performance of the New Polarized Micro Pulse Lidars R. L. Coulter and T. J. Martin Argonne National Laboratory Argonne, IL 60439 Introduction Micro pulse lidars (MPLs) have...

308

Studies of urban aerosols in the Pearl River Delta Region using lidar.  

E-Print Network (OSTI)

??In the Pearl River Delta (PRD) Region of China, three Lidar systems have been employed for monitoring aerosol distribution: a mobile micro-pulse Lidar of City… (more)

Chan, Lai Man Raymond (???)

2007-01-01T23:59:59.000Z

309

A light detection and ranging (lidar) study of the Sierra Nevada  

E-Print Network (OSTI)

2005). "An evaluation of LiDAR-derived elevation and terrainheight using a combination of lidar and aerial photography."error associated with lidar-derived DEM interpolation."

Phelps, Gary M. II

2011-01-01T23:59:59.000Z

310

NEHRP - Northern California LiDAR Hillshades in Google ...  

Science Conference Proceedings (OSTI)

Library. Northern California LiDAR Hillshades in Google Earth. ... Increasing the disk cache size in Google Earth to 2000MB is advised. ...

311

Building model reconstruction from lidar data and aerial photographs.  

E-Print Network (OSTI)

??The objective of this research is to reconstruct 3D building models from imagery and LIDAR data. The images used are stereo aerial photographs with known… (more)

Ma, Ruijin

2005-01-01T23:59:59.000Z

312

Upgrade To The Pierre Auger Cosmic Ray Observatory's Lidar System.  

E-Print Network (OSTI)

??The Pierre Auger Cosmic Ray Observatory currently operates four elastic lidar systems in order to characterize the atmospheric aerosol content above the observatory. The atmospheric… (more)

Petermann, Emily B

2010-01-01T23:59:59.000Z

313

LiDAR (Monaster And Coolbaugh, 2007) | Open Energy Information  

Open Energy Info (EERE)

Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon LiDAR (Monaster And Coolbaugh, 2007) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal...

314

Cloud properties derived from the High Spectral Resolution Lidar...  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloud properties derived from the High Spectral Resolution Lidar during MPACE Eloranta, Edwin University of Wisconsin Category: Field Campaigns Cloud properties were derived from...

315

Raman accumulator as a fusion laser driver  

DOE Patents (OSTI)

Apparatus for simultaneous laser pulse amplification and compression, using multiple pass Raman scattering in one Raman cell and pulse switchout from the optical cavity through use of a dichroic device associated with the Raman cell.

George, E.V.; Swingle, J.C.

1982-03-31T23:59:59.000Z

316

Raman accumulator as a fusion laser driver  

SciTech Connect

Apparatus for simultaneous laser pulse amplification and compression, using multiple pass Raman scattering in one Raman cell and pulse switchout from the optical cavity through use of a dichroic device associated with the Raman cell.

George, E. Victor (Livermore, CA); Swingle, James C. (Livermore, CA)

1985-01-01T23:59:59.000Z

317

Surface-enhanced Raman scattering (SERS) dosimeter and probe  

DOE Patents (OSTI)

A dosimeter and probe for measuring exposure to chemical and biological compounds is disclosed. The dosimeter or probe includes a collector which may be analyzed by surface-enhanced Raman spectroscopy. The collector comprises a surface-enhanced Raman scattering-active material having a coating applied thereto to improve the adsorption properties of the collector. The collector may also be used in automated sequential devises, in probe array devices.

Vo-Dinh, Tuan (Knoxville, TN)

1995-01-01T23:59:59.000Z

318

Stimulated Raman Side Scattering in Laser Wakefield Acceleration  

Science Conference Proceedings (OSTI)

Stimulated Raman side scattering of an ultrashort high power laser pulse is studied in experiments on laser wakefield acceleration. Experiments and simulations reveal that stimulated Raman side scattering occurs at the beginning of the interaction, that it contributes to the evolution of the pulse prior to wakefield formation, and also that it affects the quality of electron beams generated. The relativistic shift of the plasma frequency is measured.

Matsuoka, T.; McGuffey, C.; Cummings, P. G.; Horovitz, Y.; Dollar, F.; Chvykov, V.; Kalintchenko, G.; Rousseau, P.; Yanovsky, V.; Bulanov, S. S.; Thomas, A. G. R.; Maksimchuk, A.; Krushelnick, K. [Center for Ultrafast Optical Science and FOCUS Center, University of Michigan, Ann Arbor, Michigan 48109 (United States)

2010-07-16T23:59:59.000Z

319

Lidar techniques for search and rescue  

SciTech Connect

Four techniques for using LIDAR in Search and Rescue Operations will be discussed. The topic will include laser retroreflection, laser-induced fluorescence in the visible, laser-induced fluorescence during daylight hours, and laser-induced fluorescence in the uv. These techniques use high-repetition rate lasers at a variety of frequencies to induce either fluorescence in dye markers or retroreflection from plastic corner cubes on life preservers and other emergency markers.

Cabral, W.L.

1985-01-01T23:59:59.000Z

320

Raman observations of quantum interference in the $\  

E-Print Network (OSTI)

Coherent anti-Stokes Raman spectra (CARS) were obtained for CO$_2$ in a positive column discharge. The intensities of the Raman transitions to the $\

McCluskey, C W; Cluskey, Craig W. Mc; Stoker, David S.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Author manuscript, published in "International Conference on Image Processing (ICIP) (2009)" LIDAR WAVEFORM MODELING USING A MARKED POINT PROCESS  

E-Print Network (OSTI)

Lidar waveforms are 1D signal consisting of a train of echoes where each of them correspond to a scattering target of the Earth surface. Modeling these echoes with the appropriate parametric function is necessary to retrieve physical information about these objects and characterize their properties. This paper presents a marked point process based model to reconstruct a lidar signal in terms of a set of parametric functions. The model takes into account both a data term which measures the coherence between the models and the waveforms, and a regularizing term which introduces physical knowledge on the reconstructed signal. We search for the best configuration of functions by performing a Reversible Jump Markov Chain Monte Carlo sampler coupled with a simulated annealing. Results are finally presented on different kinds of signals in urban areas. Index Terms — Signal reconstruction, Lidar, Source modeling, Marked point process, RJMCMC, 3D point cloud.

Clément Mallet; Florent Lafarge; Frédéric Bretar; Uwe Soergel; Christian Heipke

2013-01-01T23:59:59.000Z

322

Research Highlight  

NLE Websites -- All DOE Office Websites (Extended Search)

Raman Lidar Observations of Aerosol Humidification Near Clouds Raman Lidar Observations of Aerosol Humidification Near Clouds Submitter: Ferrare, R. A., NASA - Langley Research Center Area of Research: Aerosol Properties Working Group(s): Aerosol Journal Reference: Ferrare, R., et al., Evaluation of Daytime Measurements of Aerosols and Water Vapor Made by an Operational Raman Lidar over the Southern Great Plains, J. Geophys. Res., 111, D05S08, doi:10.1029/2005JD005836, 2006. Relative humidity profiles derived from the Raman lidar during the ALIVE 2005 field experiment. Aerosol extinction profiles derived from the Raman lidar during the ALIVE 2005 field experiment. Aerosol humidification factor f(RH) from Raman lidar measured profiles of aerosol extinction and relative humidity. Upgrades to the Raman lidar at the ARM Climate Research Facility (ACRF)

323

Details of Colliding Thunderstorm Outflows as Observed by Doppler Lidar  

Science Conference Proceedings (OSTI)

Three cases of colliding outflow boundaries are examined using data collected from the NOAA Doppler lidar and a meteorological tower during the summer of 1986 near Boulder, Colorado. The data are unique because the lidar and the 300 m tower were ...

J. M. Intrieri; A. J. Bedard Jr.; R. M. Hardesty

1990-05-01T23:59:59.000Z

324

Aerosol size distribution using Lidar data and a typical Lidar assembly  

Science Conference Proceedings (OSTI)

An algorithm is developed and detailed in this paper which determines atmospheric aerosol parameters such as backscatter and extinction coefficients, aerosol optical thickness, and the aerosol size distribution. The algorithm uses the power profile data ... Keywords: LIDAR system, aerosol optical depth, aerosol size distribution, remote sensing

Hamed Parsiani; Javier Mèndez

2008-11-01T23:59:59.000Z

325

Classification of Ice Crystal Shapes in Midlatitude Ice Clouds from Three Years of Lidar Observations over the SIRTA Observatory  

Science Conference Proceedings (OSTI)

This paper presents a study of ice crystal shapes in midlatitude ice clouds inferred from a technique based on the comparison of ray-tracing simulations with lidar depolarization ratio measured at 532 nm. This technique is applied to three years ...

Vincent Noel; Helene Chepfer; Martial Haeffelin; Yohann Morille

2006-11-01T23:59:59.000Z

326

Field Raman Spectrograph for Environmental Analysis  

SciTech Connect

The widespread contamination found across the US Department of Energy (DOE) complex has received considerable attention from the government and public alike. A massive site characterization and cleanup effort has been underway for several years and is expected to continue for several decades more. The scope of the cleanup effort ranges from soil excavation and treatment to complete dismantling and decontamination of whole buildings. To its credit, DOE has supported research and development of new technologies to speed up and reduce the cost of this effort. One area in particular has been the development of portable instrumentation that can be used to perform analytical measurements in the field. This approach provides timely data to decision makers and eliminates the expense, delays, and uncertainties of sample preservation, transport, storage, and laboratory analysis. In this program, we have developed and demonstrated in the field a transportable, high performance Raman spectrograph that can be used to detect and identify contaminants in a variety of scenarios. With no moving parts, the spectrograph is rugged and can perform many Raman measurements in situ with flexible fiber optic sampling probes. The instrument operates under computer control and a software package has been developed to collect and process spectral data. A collection of Raman spectra for 200 contaminants of DOE importance has been compiled in a searchable format to assist in the identification of unknown contaminants in the field.

Sylvia, J.M.; Haas, J.W.; Spencer, K.M.; Carrabba, M.M.; Rauh, R.D.; Forney, R.W.; Johnston, T.M.

1998-07-01T23:59:59.000Z

327

Scanning angle Raman spectroscopy: Investigation of Raman scatter enhancement techniques for chemical analysis  

SciTech Connect

This thesis outlines advancements in Raman scatter enhancement techniques by applying evanescent fields, standing-waves (waveguides) and surface enhancements to increase the generated mean square electric field, which is directly related to the intensity of Raman scattering. These techniques are accomplished by employing scanning angle Raman spectroscopy and surface enhanced Raman spectroscopy. A 1064 nm multichannel Raman spectrometer is discussed for chemical analysis of lignin. Extending dispersive multichannel Raman spectroscopy to 1064 nm reduces the fluorescence interference that can mask the weaker Raman scattering. Overall, these techniques help address the major obstacles in Raman spectroscopy for chemical analysis, which include the inherently weak Raman cross section and susceptibility to fluorescence interference.

Meyer, Matthew W. [Ames Laboratory

2013-03-14T23:59:59.000Z

328

Mitigation of Coastal Bluff Instability in San Diego County, California/Evaluating Seacliff Morphology and Erosion Control in San Diego County Using LIDAR and GIS  

E-Print Network (OSTI)

of merging the aerial and ground- based LIDAR surfaces. Inmerging bathymetric LIDAR and high resolution photographyFigure 11. Merging aerial and ground-based LIDAR surfaces.

Ashford, Scott

2005-01-01T23:59:59.000Z

329

DOE/SC-ARM/TR-120 Raman Lidar Profiles–Temperature (RLPROFTEMP) Value-Added Product  

E-Print Network (OSTI)

This report was prepared as an account of work sponsored by the U.S. Government. Neither the United States nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect

Rk Newsom; C Sivaraman; Sa Mcfarlane; C Sivaraman; Sa Mcfarlane

2012-01-01T23:59:59.000Z

330

Automated Retrievals of Water Vapor and Aerosol Profiles from an Operational Raman Lidar  

Science Conference Proceedings (OSTI)

Automated routines have been developed to derive water vapor mixing ratio, relative humidity, aerosol extinction and backscatter coefficient, and linear depolarization profiles, as well as total precipitable water vapor and aerosol optical ...

D. D. Turner; R. A. Ferrare; L. A. Heilman Brasseur; W. F. Feltz; T. P. Tooman

2002-01-01T23:59:59.000Z

331

ARM - Field Campaign - NASA Coordinated Airborne CO2 Lidar Flight Test  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaignsNASA Coordinated Airborne CO2 Lidar Flight Test Campaign govCampaignsNASA Coordinated Airborne CO2 Lidar Flight Test Campaign Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : NASA Coordinated Airborne CO2 Lidar Flight Test Campaign 2009.07.27 - 2009.08.07 Lead Scientist : Edward Browell For data sets, see below. Description This airborne field test campaign was designed to obtain a coordinated set of remote CO2 Laser Absorption Spectrometer (LAS) measurements using the NASA Langley/ITT 1.57-micron Continuous-Wave (CW) LAS operating from the NASA Langley UC-12 aircraft; the NASA Goddard 1.57-micron pulsed LAS operating from the NASA Glenn Lear-25 aircraft; and the NASA Jet Propulsion Laboratory 2.0-micron CW-coherent LAS operating from a contracted Twin Otter aircraft. These remote LAS CO2 column measurements were compared with

332

The melting layer: The radar bright band is dark for lidar  

E-Print Network (OSTI)

Measurements of the melting layer were made with radar and lidar, during light rain. At the height at which a weather radar sees a bright band, the backscatter from the lidar has a minimum. Sometimes this minimum is more than 20 dB deep relative to the rain underneath. In this paper the measurements will be analysed in detail. Five mechanisms that can contribute to this effect are discussed: 1. Refractive index change during melting; 2. Aggregation and breakup; 3. Structural collapse of the melting snowflake; 4. Enhanced vertical backscatter of water droplets; 5. The orientation and shape of the melting crystals. Keywords: radar, cloud radar, lidar, melting layer, orientation of crystals. 1. Introduction In the Netherlands stratiform rain is mainly produced by the melting of ice particles into rain droplets. Normally this happens in a well-defined layer, just below the zero degree level. This melting layer is characterised by high radar reflections, the so-called bright band. This b...

V. K. C. Venema; H. W. J. Russchenberg; A van Lammeren; A. Apituley; L.P. Ligthart; Royal Netherl; S Meteorological Organisation

1998-01-01T23:59:59.000Z

333

X:\\ARM_19~1\\P193-223.WPD  

NLE Websites -- All DOE Office Websites (Extended Search)

Raman Lidar Measurements of Water Vapor and Aerosols During the Atmospheric Radiation Measurement (ARM) Remote Cloud Sensing (RCS) Intensive Observation Period (IOP) S.H. Melfi, D....

334

Active probing of cloud multiple scattering, optical depth, vertical thickness, and liquid water content using wide-angle imaging LIDAR.  

SciTech Connect

At most optical wavelengths, laser light in a cloud lidar experiment is not absorbed but merely scattered out of the beam, eventually escaping the cloud via multiple scattering. There is much information available in this light scattered far from the input beam, information ignored by traditional 'on-beam' lidar. Monitoring these off-beam returns in a fully space- and time-resolved manner is the essence of our unique instrument, Wide Angle Imaging Lidar (WAIL). In effect, WAIL produces wide-field (60-degree full-angle) 'movies' of the scattering process and records the cloud's radiative Green functions. A direct data product of WAIL is the distribution of photon path lengths resulting from multiple scattering in the cloud. Following insights from diffusion theory, we can use the measured Green functions to infer the physical thickness and optical depth of the cloud layer, and, from there, estimate the volume-averaged liquid water content. WAIL is notable in that it is applicable to optically thick clouds, a regime in which traditional lidar is reduced to ceilometry. Here we present recent WAIL data oti various clouds and discuss the extension of WAIL to full diurnal monitoring by means of an ultra-narrow magneto-optic atomic line filter for daytime measurements.

Love, Steven P.; Davis, A. B. (Anthony B.); Rohde, C. A. (Charles A.); Tellier, L. L. (Larry L.); Ho, Cheng,

2002-01-01T23:59:59.000Z

335

Atmospheric Data, Images, and Animations from Lidar Instruments used by the University of Wisconsin Lidar Group  

DOE Data Explorer (OSTI)

The Space Science and Engineering Center is a research and development center affiliated with the University of Wisconsin-Madison’s Graduate School. Its primary focus is on geophysical research and technology to enhance understanding of the atmosphere of Earth, the other planets in the Solar System, and the cosmos. SSEC develops new observing tools for spacecraft, aircraft, and ground-based platforms, and models atmospheric phenomena. The Center receives, manages and distributes huge amounts of geophysical data and develops software to visualize and manipulate these data for use by researchers and operational meteorologists all over the world.[Taken from About SSEC at http://www.ssec.wisc.edu/overview/] A huge collection of data products, images, and animations comes to the SSEC from the University of Wisconsin Lidar Group. Contents of this collection include: • An archive of thousands of Lidar images acquired before 2004 • Arctic HSRL, MMCR, PAERI, MWR, Radiosonde, and CRAS forecast data Data after May 1, 2004 • MPEG animations and Lidar Multiple Scattering Models

336

Mitigation of Coastal Bluff Instability in San Diego County, California/Evaluating Seacliff Morphology and Erosion Control in San Diego County Using LIDAR and GIS  

E-Print Network (OSTI)

County Using LIDAR and GIS In order to evaluate seacliffgeographic information systems (GIS) analysis. LIDAR is the

Ashford, Scott

2005-01-01T23:59:59.000Z

337

ARM - Field Campaign - Boundary Layer CO2 Using CW Lidar  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaignsBoundary Layer CO2 Using CW Lidar govCampaignsBoundary Layer CO2 Using CW Lidar Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Boundary Layer CO2 Using CW Lidar 2005.05.21 - 2005.05.24 Lead Scientist : Michael Dobbs Description Overflights Underway at ACRF Southern Great Plains Site (M.Dobbs/J.Liljegren) Science collaborators at ITT Industries and the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) conducted flights over the Central Facility at ACRF's Southern Great Plains (SGP) site as part of the Climate Sources and Sink (CO2) Intensive Operational Period (IOP), using a CW lidar. The objective of the flights was to validate, by demonstration and comparison with SGP ground observations, the performance of the ITT system when used in conjunction with retrieval

338

Lidar Observation of Elevated Pollution Layers over Los Angeles  

Science Conference Proceedings (OSTI)

Elevated pollution layers are observed over Los Angeles with an aircraft equipped with a downward-looking lidar. For the first time, detailed ancillary upper-air kinematic and thermodynamic data were collected simultaneously to aid in the ...

Roger M. Wakimoto; James L. McElroy

1986-11-01T23:59:59.000Z

339

Effects of Wind Turbulence on Coherent Doppler Lidar Performance  

Science Conference Proceedings (OSTI)

The effects of wind turbulence on pulsed coherent Doppler lidar performance are investigated theoretically and with computer simulations. The performance of velocity estimators is determined for the case of a single realization of a wind field ...

Rod Frehlich

1997-02-01T23:59:59.000Z

340

THOR—Cloud Thickness from Offbeam Lidar Returns  

Science Conference Proceedings (OSTI)

Conventional wisdom is that lidar pulses do not significantly penetrate clouds having an optical thickness exceeding about ? = 2, and that no returns are detectible from more than a shallow skin depth. Yet optically thicker clouds of ? ? 2 ...

Robert F. Cahalan; Matthew McGill; John Kolasinski; Tamás Várnai; Ken Yetzer

2005-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Analysis of Concentration Fluctuations from Lidar Observations of Atmospheric Plumes  

Science Conference Proceedings (OSTI)

A series of nearly instantaneous vertical cross sections of power-plant plume concentrations obtained by both airborne and ground-based lidar systems for the Electric Power Research Institute (EPRI) Plume Model Validation and Development Project ...

W. S. Lewellen; R. I. Sykes

1986-08-01T23:59:59.000Z

342

Estimating Spatial Velocity Statistics with Coherent Doppler Lidar  

Science Conference Proceedings (OSTI)

The spatial statistics of a simulated turbulent velocity field are estimated using radial velocity estimates from simulated coherent Doppler lidar data. The structure functions from the radial velocity estimates are processed to estimate the ...

Rod Frehlich; Larry Cornman

2002-03-01T23:59:59.000Z

343

ARM - Field Campaign - M-PACE - Polarization Diversity Lidar...  

NLE Websites -- All DOE Office Websites (Extended Search)

- Polarization Diversity Lidar (PDL) Campaign Links M-PACE Website Comments? We would love to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send Campaign :...

344

Lidar Observations of Banded Convection during BLX83  

Science Conference Proceedings (OSTI)

Lidar observations of clear-air convection during the 1983 Boundary Layer Experiment (BLX83) reveal the presence of elongated, parallel regions of updrafts marked by enhanced aerosol backscattering. These linear (banded) aerosol structures were ...

R. A. Ferrare; J. L. Schols; E. W. Eloranta; R. Coulter

1991-03-01T23:59:59.000Z

345

Evaluating Large-Eddy Simulations Using Volume Imaging Lidar Data  

Science Conference Proceedings (OSTI)

The authors apply data analysis techniques that demonstrate the power of using volume imaging lidar observations to evaluate several aspects of large-eddy simulations (LESs). They present observations and simulations of an intense and spatially ...

Shane D. Mayor; Gregory J. Tripoli; Edwin W. Eloranta

2003-07-01T23:59:59.000Z

346

Comparison of 2- and 10-µm Coherent Doppler Lidar Performance  

Science Conference Proceedings (OSTI)

The performance of 2- and 10-µm coherent Doppler lidar is presented in terms of the statistical distribution of the maximum-likelihood velocity estimator from simulations for fixed range resolution and fixed velocity search space as a function of ...

Rod Frehlich

1995-04-01T23:59:59.000Z

347

ARM - Field Campaign - M-PACE HSR Lidar  

NLE Websites -- All DOE Office Websites (Extended Search)

HSR Lidar Campaign Links Full Proposal Abstract M-PACE Website Comments? We would love to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : M-PACE...

348

Vorticity from Line-of-Sight Lidar Velocity Scans  

Science Conference Proceedings (OSTI)

A method is presented to compute the spanwise vorticity in polar coordinates from 2D vertical cross sections of high-resolution line-of-sight Doppler wind lidar observations. The method uses the continuity equation to derive the velocity ...

Martin Weissmann; Andreas Dörnbrack; James D. Doyle

2009-12-01T23:59:59.000Z

349

Automatic registration of LIDAR and optical images of urban scenes  

E-Print Network (OSTI)

Fusion of 3D laser radar (LIDAR) imagery and aerial optical imagery is an efficient method for constructing 3D virtual reality models. One difficult aspect of creating such models is registering the optical image with the ...

Mastin, Dana Andrew

350

Airborne Doppler Lidar Observations of Convective Phenomena in Oklahoma  

Science Conference Proceedings (OSTI)

On 30 June 1981, the wind fields around a variety of convective clouds, ranging from large thunderstorm complexes to isolated cumulus congestus, were observed in Oklahoma using an airborne Doppler lidar operated by the National Aeronautics and ...

Eugene W. McCaul Jr.; Howard B. Bluestein; Richard J. Doviak

1987-09-01T23:59:59.000Z

351

Munitions related feature extraction from LIDAR data.  

Science Conference Proceedings (OSTI)

The characterization of former military munitions ranges is critical in the identification of areas likely to contain residual unexploded ordnance (UXO). Although these ranges are large, often covering tens-of-thousands of acres, the actual target areas represent only a small fraction of the sites. The challenge is that many of these sites do not have records indicating locations of former target areas. The identification of target areas is critical in the characterization and remediation of these sites. The Strategic Environmental Research and Development Program (SERDP) and Environmental Security Technology Certification Program (ESTCP) of the DoD have been developing and implementing techniques for the efficient characterization of large munitions ranges. As part of this process, high-resolution LIDAR terrain data sets have been collected over several former ranges. These data sets have been shown to contain information relating to former munitions usage at these ranges, specifically terrain cratering due to high-explosives detonations. The location and relative intensity of crater features can provide information critical in reconstructing the usage history of a range, and indicate areas most likely to contain UXO. We have developed an automated procedure using an adaptation of the Circular Hough Transform for the identification of crater features in LIDAR terrain data. The Circular Hough Transform is highly adept at finding circular features (craters) in noisy terrain data sets. This technique has the ability to find features of a specific radius providing a means of filtering features based on expected scale and providing additional spatial characterization of the identified feature. This method of automated crater identification has been applied to several former munitions ranges with positive results.

Roberts, Barry L.

2010-06-01T23:59:59.000Z

352

Use of a Lidar Forward Model for Global Comparisons of Cloud Fraction between the ICESat Lidar and the ECMWF Model  

Science Conference Proceedings (OSTI)

The performance of the European Centre for Medium-Range Weather Forecasts (ECMWF) model in simulating clouds is evaluated using observations by the Geoscience Laser Altimeter System lidar on the Ice, Cloud, and Land Elevation Satellite (ICESat). ...

Jonathan M. Wilkinson; Robin J. Hogan; Anthony J. Illingworth; Angela Benedetti

2008-10-01T23:59:59.000Z

353

Observations of Ferroelastic Switching by Raman Spectroscopy  

E-Print Network (OSTI)

Thermal barrier coatings (TBCs) have become an important part of turbine technology by providing thermal protection to the underlying metallic components. These coatings are typically made from a zirconia-based ceramics which have a low thermal conductivity and thermal expansion coefficients similar to those of the superalloys. Early failure in these coatings is most often due to foreign object damage and erosion resulting in delamination and spallation. To protect against these types of failure, new materials with increased toughness are needed. There are two main toughening mechanisms in ceramics: transformation toughening, which is limited to low temperature applications and ferroelastic toughening which is accessible at all temperatures. Ferroelastic toughening occurs when the c-axis of the tetragonal grain undergoes reorientation under the application of an external stress. In this study, ferroelastic toughening is examined by Raman spectroscopy. It is shown that by using polarized confocal Raman spectroscopy one can not only observed the ferroelastic process, but also measure the parameters that control the increase in toughness observed. Ferroelastic toughening was observed in two ways in the 18mol% ceria stabilized zirconia (18CSZ) samples studied here. Samples were either exposed to indentation damage or uniaxial loading. In both of these cases maps of the ceramic surface were taken using Raman spectroscopy following loading and the relative intensities of the tetragonal peaks were analyzed. The resulting intensity profiles were used to monitor the reorientation of domains corresponding to ferroelastic toughening. Changes in domain orientation were observed that corresponded to the reorientation of domains along cracks as well as on a larger scale along those cracks. Domain reorientation was also observed under uniaxial loading and the stresses required for domain formation and movement were measured.

Bolon, Amy Marie

2011-12-01T23:59:59.000Z

354

Resonance electronic Raman scattering in rare earth crystals  

Science Conference Proceedings (OSTI)

The intensities of Raman scattering transitions between electronic energy levels of trivalent rare earth ions doped into transparent crystals were measured and compared to theory. A particle emphasis was placed on the examination of the effect of intermediate state resonances on the Raman scattering intensities. Two specific systems were studied: Ce/sup 3 +/(4f/sup 1/) in single crystals of LuPO/sub 4/ and Er/sup 3 +/(4f/sup 11/) in single crystals of ErPO/sub 4/. 134 refs., 92 figs., 33 tabs.

Williams, G.M.

1988-11-10T23:59:59.000Z

355

Raman Spectroscopy for Experimental Investigation of Microscale ...  

Science Conference Proceedings (OSTI)

New Saccharification Process of Cellulosic Biomass by Microwave Irradiation · Novel Lamination Method for Large Armor Panels · Raman Spectroscopy for ...

356

Standoff ultraviolet raman scattering detection of trace levels of explosives.  

Science Conference Proceedings (OSTI)

Ultraviolet (UV) Raman scattering with a 244-nm laser is evaluated for standoff detection of explosive compounds. The measured Raman scattering albedo is incorporated into a performance model that focused on standoff detection of trace levels of explosives. This model shows that detection at {approx}100 m would likely require tens of seconds, discouraging application at such ranges, and prohibiting search-mode detection, while leaving open the possibility of short-range point-and-stare detection. UV Raman spectra are also acquired for a number of anticipated background surfaces: tile, concrete, aluminum, cloth, and two different car paints (black and silver). While these spectra contained features in the same spectral range as those for TNT, we do not observe any spectra similar to that of TNT.

Kulp, Thomas J.; Bisson, Scott E.; Reichardt, Thomas A.

2011-10-01T23:59:59.000Z

357

Cone penetrometer fiber optic raman spectroscopy probe assembly  

DOE Patents (OSTI)

A chemically and mechanically robust optical Raman spectroscopy probe assembly that can be incorporated in a cone penetrometer (CPT) for subsurface deployment. This assembly consists of an optical Raman probe and a penetrometer compatible optical probe housing. The probe is intended for in-situ chemical analysis of chemical constituents in the surrounding environment. The probe is optically linked via fiber optics to the light source and the detection system at the surface. A built-in broadband light source provides a strobe method for direct measurement of sample optical density. A mechanically stable sapphire window is sealed directly into the side-wall of the housing using a metallic, chemically resistant, hermetic seal design. This window permits transmission of the interrogation light beam and the resultant signal. The spectroscopy probe assembly is capable of accepting Raman, Laser induced Fluorescence, reflectance, and other optical probes with collimated output for CPT deployment.

Kyle, Kevin R. (Brentwood, CA); Brown, Steven B. (Livermore, CA)

2000-01-01T23:59:59.000Z

358

Heating by the Raman instability  

Science Conference Proceedings (OSTI)

Computer simulations are presented of the reflection and heating due to stimulated Raman backscatter of intense laser light in large regions of underdense plasma. The heated electron distribution is found to be approximately a Maxwellian of temperature (m/sub e//2)v/sub p//sup 2/, where v/sub p/ is the phase velocity of the electron plasma wave. A simple model of the reflection is presented. Raman may cause a pre-heat problem with large laser fusion reactor targets.

Estabrook, K.G.; Kruer, W.L.

1980-04-11T23:59:59.000Z

359

Estimating forest structural characteristics with airborne lidar scanning and a near-real time profiling laser systems  

E-Print Network (OSTI)

LiDAR (Light Detection and Ranging) directly measures canopy vertical structures, and provides an effective remote sensing solution to accurate and spatiallyexplicit mapping of forest characteristics, such as canopy height and Leaf Area Index. However, many factors, such as large data volume and high costs for data acquisition, precludes the operational and practical use of most currently available LiDARs for frequent and large-scale mapping. At the same time, a growing need is arising for realtime remote sensing platforms, e.g., to provide timely information for urgent applications. This study aims to develop an airborne profiling LiDAR system, featured with on-the-fly data processing, for near real- or real- time forest inventory. The development of such a system involves implementing the on-board data processing and analysis as well as building useful regression-based models to relate LiDAR measurements with forest biophysical parameters. This work established a paradigm for an on-the-fly airborne profiling LiDAR system to inventory regional forest resources in real- or near real- time. The system was developed based on an existing portable airborne laser system (PALS) that has been previously assembled at NASA by Dr. Ross Nelson. Key issues in automating PALS as an on-the-fly system were addressed, including the design of an archetype for the system workflow, the development of efficient and robust algorithms for automatic data processing and analysis, the development of effective regression models to predict forest biophysical parameters from LiDAR measurements, and the implementation of an integrated software package to incorporate all the above development. This work exploited the untouched potential of airborne laser profilers for realtime forest inventory, and therefore, documented an initial step toward developing airborne-laser-based, on-the-fly, real-time, forest inventory systems. Results from this work demonstrated the utility and effectiveness of airborne scanning or profiling laser systems for remotely measuring various forest structural attributes at a range of scales, i.e., from individual tree, plot, stand and up to regional levels. The system not only provides a regional assessment tool, one that can be used to repeatedly, remotely measure hundreds or thousands of square kilometers with little/no analyst interaction or interpretation, but also serves as a paradigm for future efforts in building more advanced airborne laser systems such as real-time laser scanners.

Zhao, Kaiguang

2008-08-01T23:59:59.000Z

360

Precipitating clouds  

NLE Websites -- All DOE Office Websites (Extended Search)

or virga An multiple sensor based approach to provide water phase as well as ice phase properties Measurements - MWR - MPL or Raman lidar - MMCR The approach Water...

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Remote Sensing J.E.M. Goldsmith, M. Lapp, and S. E. Bisson Sandia...  

NLE Websites -- All DOE Office Websites (Extended Search)

The goal of this research program is the development of a critical design for a Raman lidar system optimized to match Atmospheric Radiation Measurement (ARM) Program needs for...

362

ferrare-98.pdf  

NLE Websites -- All DOE Office Websites (Extended Search)

5 CART and GSFC Raman Lidar Measurements of Atmospheric Aerosol Backscattering and Extinction Profiles for EOS Validation and ARM Radiation Studies R. A. Ferrare NASA-Langley...

363

ARM - Publications: Science Team Meeting Documents  

NLE Websites -- All DOE Office Websites (Extended Search)

in Stratus Clouds Evidence of High Ice Supersaturation in Cirrus Clouds Using ARM Raman Lidar Measurements* Local Correlations and Multifractal Behavior in Marine Boundary Layer...

364

Lidar Investigation of the Temporal and Spatial Distribution of Atmospheric Aerosols in Mountain Valleys  

Science Conference Proceedings (OSTI)

Lidar experiments were conducted in the mountainous region of Bulgaria to determine the spatial and temporal distribution of major aerosol sources and the zones of aerosol accumulation. When these lidar data are combined with conventional ...

Plamen B. Savov; Toni S. Skakalova; Ivan N. Kolev; Francis L. Ludwig

2002-05-01T23:59:59.000Z

365

The Structure of the Unstable Marine Boundary Layer Viewed by Lidar and Aircraft Observations  

Science Conference Proceedings (OSTI)

The combination of vertical lidar and in situ meteorological observations from two aircraft provide an unprecedented view of the marine atmospheric boundary layer (MABL) during a cold air outbreak. To a first approximation, the lidar reflectivity ...

David Atlas; Bernard Walter; Shu-Hsien Chou; P. J. Sheu

1986-07-01T23:59:59.000Z

366

Lidar Sensing of Plume Dispersion: Analysis Methods and Product Quality for Light-Scattering Tracer Particles  

Science Conference Proceedings (OSTI)

Analysis procedures are described for retrieving accurate plume information from lidar data on light-scattering particles during atmospheric dispersion experiments. Interactive computer graphics aided in the solution of the lidar equation for ...

W. L. Eberhard; G. T. McNice; S. W. Troxel

1987-12-01T23:59:59.000Z

367

Simulation of Coherent Doppler Lidar Performance in the Weak-Signal Regime  

Science Conference Proceedings (OSTI)

The performance of coherent Doppler lidar in the weak-signal regime is investigated by computer simulations of velocity estimators that accumulate the signal from N pulses of zero-mean complex Gaussian stationary lidar data described by a ...

Rod Frehlich

1996-06-01T23:59:59.000Z

368

Performance of an Adaptive Notch Filter for Spectral Analysis of Coherent Lidar Signals  

Science Conference Proceedings (OSTI)

An adaptive notch filter (ANF) is proposed for range-resolved frequency estimates of Doppler lidar atmospheric returns. The ANF is based on the spectral filtering of lidar return to remove the atmospheric contribution from noise. An adaptive ...

Jean-Luc Zarader; Gérard Ancellet; Alain Dabas; Nacer K. M'Sirdi; Pierre H. Flamant

1996-02-01T23:59:59.000Z

369

The Pulsed Coherent Doppler Lidar: Observations of Frontal Structure and the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

The NOAA/WPL pulsed coherent Doppler lidar was used during the Texas Frontal Experiment in 1985 to study mesoscale preconvective atmospheric conditions. On 22 April 1985, the Doppler lidar, in conjunction with serial rawinsonde ascents and ...

Paul J. Neiman; M. A. Shapiro; R. Michael Hardesty; B. Boba Stankov; Rhidian T. Lawrence; Robert J. Zamora; Tamara Hampel

1988-08-01T23:59:59.000Z

370

Maximum Likelihood Estimates of Vortex Parameters from Simulated Coherent Doppler Lidar Data  

Science Conference Proceedings (OSTI)

The performance of pulsed coherent Doppler lidar in estimating aircraft trailing wake vortices by scanning across the aircraft flight track is evaluated using Monte Carlo lidar simulations of a simple vortex pair in both a nonturbulent and ...

Rod Frehlich; Robert Sharman

2005-02-01T23:59:59.000Z

371

LiDAR At Glass Buttes Area (DOE GTP) | Open Energy Information  

Open Energy Info (EERE)

LiDAR At Glass Buttes Area (DOE GTP) Exploration Activity Details Location Glass Buttes Area Exploration Technique LiDAR Activity Date Usefulness not indicated DOE-funding Unknown...

372

Doppler Lidar Estimation of Mixing Height Using Turbulence, Shear, and Aerosol Profiles  

Science Conference Proceedings (OSTI)

The concept of boundary layer mixing height for meteorology and air quality applications using lidar data is reviewed, and new algorithms for estimation of mixing heights from various types of lower-tropospheric coherent Doppler lidar ...

Sara C. Tucker; Christoph J. Senff; Ann M. Weickmann; W. Alan Brewer; Robert M. Banta; Scott P. Sandberg; Daniel C. Law; R. Michael Hardesty

2009-04-01T23:59:59.000Z

373

Retrieval of Urban Boundary Layer Structures from Doppler Lidar Data. Part I: Accuracy Assessment  

Science Conference Proceedings (OSTI)

Two coherent Doppler lidars from the U.S. Army Research Laboratory (ARL) and Arizona State University (ASU) were deployed in the Joint Urban 2003 atmospheric dispersion field experiment (JU2003) held in Oklahoma City, Oklahoma. The dual-lidar ...

Quanxin Xia; Ching-Long Lin; Ronald Calhoun; Rob K. Newsom

2008-01-01T23:59:59.000Z

374

Detailed Characterization of Electron Plasma Waves Produced by Stimulated Raman Scattering  

Science Conference Proceedings (OSTI)

Time-resolved spectra and location of electron plasma waves (EPW) produced by stimulated Raman scattering in back and in side directions have been measured using Thomson scattering of a short wavelength probe beam. Significant Raman sidescattering was observed for angles as large as 40{degree} from the laser axis. The Raman growth is larger and starts earlier in the front part of the density profile than at the summit. Simultaneous measurements at multiple places in the plasma provided an indication of the coherence length of the EPW. {copyright} {ital 1996 The American Physical Society.}

Renard, N.; Labaune, C.; Baldis, H.A.; Bauer, B.S.; Quesnel, B.; Schifano, E.; Michard, A. [Laboratoire pour l`Utilisation des Lasers Intenses, Ecole Polytechnique, Centre National de la Recherche Scientifique, 91128 Palaiseau cedex (France); Seka, W. [Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627 (United States); Estabrook, K.G. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

1996-10-01T23:59:59.000Z

375

Inverse Raman effect: applications and detection techniques  

SciTech Connect

The processes underlying the inverse Raman effect are qualitatively described by comparing it to the more familiar phenomena of conventional and stimulated Raman scattering. An experession is derived for the inverse Raman absorption coefficient, and its relationship to the stimulated Raman gain is obtained. The power requirements of the two fields are examined qualitatively and quantitatively. The assumption that the inverse Raman absorption coefficient is constant over the interaction length is examined. Advantages of the technique are discussed and a brief survey of reported studies is presented.

Hughes, L.J. Jr.

1980-08-01T23:59:59.000Z

376

Inversion-free, noiseless Raman echoes  

E-Print Network (OSTI)

Using double optical Raman rephasing, an inversion-free resonant Raman echo is studied in an inhomogeneously broadened spin ensemble of a solid medium, where the Raman optical field-excited spin coherence has a frozen propagation vector. Unlike photon echoes whose quantum memory application is strictly limited due to \\pi rephasing pulse-induced population inversion causing quantum noises, the optical Raman field-excited spin echo is inherently silent owing to the frozen propagation vector. Thus, the doubly rephased Raman echo can be directly applied for quantum interface in a population inversion-free environment.

Byoung S. Ham

2011-11-20T23:59:59.000Z

377

Classification of Multispectral High-Resolution Satellite Imagery Using LIDAR Elevation Data  

Science Conference Proceedings (OSTI)

This paper studies the influence of airborne LIDAR elevation data on the classification of multispectral SPOT5 imagery over a semi-urban area; to do this, multispectral and LIDAR elevation data are integrated in a single imagery file composed of independent ... Keywords: Classification, LIDAR, Satellite Imagery, Support Vector Machine

María C. Alonso; José A. Malpica

2008-12-01T23:59:59.000Z

378

GPU-based roofs' solar potential estimation using LiDAR data  

Science Conference Proceedings (OSTI)

Solar potential estimation using LiDAR data is an efficient approach for finding suitable roofs for photovoltaic systems' installations. As the amount of LiDAR data increases, the non-parallel methods take considerable time to accurately estimate the ... Keywords: CUDA, GPU, LiDAR, Solar potential

Niko Luka?, Borut Alik

2013-03-01T23:59:59.000Z

379

Characterizing Aerosol Distributions and Optical Properties Using the NASA Langley High Spectral Resolution Lidar  

SciTech Connect

The objective of this project was to provide vertically and horizontally resolved data on aerosol optical properties to assess and ultimately improve how models represent these aerosol properties and their impacts on atmospheric radiation. The approach was to deploy the NASA Langley Airborne High Spectral Resolution Lidar (HSRL) and other synergistic remote sensors on DOE Atmospheric Science Research (ASR) sponsored airborne field campaigns and synergistic field campaigns sponsored by other agencies to remotely measure aerosol backscattering, extinction, and optical thickness profiles. Synergistic sensors included a nadir-viewing digital camera for context imagery, and, later in the project, the NASA Goddard Institute for Space Studies (GISS) Research Scanning Polarimeter (RSP). The information from the remote sensing instruments was used to map the horizontal and vertical distribution of aerosol properties and type. The retrieved lidar parameters include profiles of aerosol extinction, backscatter, depolarization, and optical depth. Products produced in subsequent analyses included aerosol mixed layer height, aerosol type, and the partition of aerosol optical depth by type. The lidar products provided vertical context for in situ and remote sensing measurements from other airborne and ground-based platforms employed in the field campaigns and was used to assess the predictions of transport models. Also, the measurements provide a data base for future evaluation of techniques to combine active (lidar) and passive (polarimeter) measurements in advanced retrieval schemes to remotely characterize aerosol microphysical properties. The project was initiated as a 3-year project starting 1 January 2005. It was later awarded continuation funding for another 3 years (i.e., through 31 December 2010) followed by a 1-year no-cost extension (through 31 December 2011). This project supported logistical and flight costs of the NASA sensors on a dedicated aircraft, the subsequent analysis and archival of the data, and the presentation of results in conferences, workshops, and publications. DOE ASR field campaigns supported under this project included - MAX-Mex /MILAGRO (2006) - TexAQS 2006/GoMACCS (2006) - CHAPS (2007) - RACORO (2009) - CARE/CalNex (2010) In addition, data acquired on HSRL airborne field campaigns sponsored by other agencies were used extensively to fulfill the science objectives of this project and the data acquired have been made available to other DOE ASR investigators upon request.

Hostetler, Chris; Ferrare, Richard

2013-02-14T23:59:59.000Z

380

ARM - Facility News Article  

NLE Websites -- All DOE Office Websites (Extended Search)

October 6, 2010 [Facility News] October 6, 2010 [Facility News] New Raman Lidar En Route to Australia Bookmark and Share Since 1996, the ARM Southern Great Plains site has maintained one of the few operational Raman lidars in the world. Now, thanks to funding from the American Recovery and Reinvestment Act, the ARM Tropical Western Pacific site is about to join that exclusive group. A new Raman lidar, built by Sandia National Laboratories in New Mexico, is on its way to Darwin, Australia. Optics contained inside the Raman lidar shelter guide backscattered laser radiation in order to measure signals collected by the telescope. Optics contained inside the Raman lidar shelter guide backscattered laser radiation in order to measure signals collected by the telescope. The Raman lidar (light detection and ranging) uses pulses of laser

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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381

Interface between land and water,shoreline change analyses for erosion/accretion,hazards,planning Derived from coastal survey maps,nautical charts,aerial photos,LIDAR  

E-Print Network (OSTI)

/accretion,hazards,planning Derived from coastal survey maps,nautical charts,aerial photos,LIDAR Linear features Can be animated survey maps/charts,legal definitions,clipping/masking;various measuring devices Linear and polygonal:10,000 to 1:24,000;locational accuracy ~10-50 m Point and line symbology annotated with species type Survey

Wright, Dawn Jeannine

382

The Airborne Demonstrator for the Direct-Detection Doppler Wind Lidar ALADIN on ADM-Aeolus. Part II: Simulations and Rayleigh Receiver Radiometric Performance  

Science Conference Proceedings (OSTI)

In the frame of the Atmospheric Dynamics Mission Aeolus (ADM-Aeolus) satellite mission by the European Space Agency (ESA), a prototype of a direct-detection Doppler wind lidar was developed to measure wind from ground and aircraft at 355 nm. Wind ...

Ulrike Paffrath; Christian Lemmerz; Oliver Reitebuch; Benjamin Witschas; Ines Nikolaus; Volker Freudenthaler

2009-12-01T23:59:59.000Z

383

ARM: ARSCL: multiple outputs from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR  

DOE Data Explorer (OSTI)

ARSCL: multiple outputs from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR

Richard Coulter; Kevin Widener; Nitin Bharadwaj; Karen Johnson; Timothy Martin

384

ARM: ARSCL: cloud boundaries from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR  

DOE Data Explorer (OSTI)

ARSCL: cloud boundaries from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR

Richard Coulter; Kevin Widener; Nitin Bharadwaj; Karen Johnson; Timothy Martin

385

ARM - Field Campaign - Lidar support for ICECAPS at Summit, Greenland  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaignsLidar support for ICECAPS at Summit, Greenland govCampaignsLidar support for ICECAPS at Summit, Greenland Campaign Links ICECAPS Campaign Summary (PDF) Summit Station Research Highlight New Data from Greenland for Arctic Climate Research Cloud Cocktail Melts Greenland Ice Sheet Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Lidar support for ICECAPS at Summit, Greenland 2010.04.15 - 2014.10.31 Lead Scientist : David Turner Description Beginning in May 2010, the Integrated Characterization of Energy, Clouds, Atmospheric State, and Precipitation over Summit (ICECAPS) project, funded through the National Science Foundation's Arctic Observing Network, is deploying a suite of remote sensors at Summit, Greenland, for four years. With dining facilities and communications gear, the "Big House" at Summit Station serves as the central gathering area for site researchers. (Photo courtesy Summit Station.)

386

Lidar-based Studies of Aerosol Optical Properties Over Coastal Areas  

E-Print Network (OSTI)

Abstract: Aerosol size distribution and concentration strongly depend on wind speed, direction, and measuring point location in the marine boundary layer over coastal areas. The marine aerosol particles which are found over the sea waves in high wind conditions affect visible and near infrared propagation for paths that pass very close to the surface as well as the remote sensing measurements of the sea surface. These particles are produced by various air sea interactions. This paper presents the results of measurements taken at numerous coastal stations between 1992 and 2006 using an FLS-12 lidar system together with other supporting instrumentation. The investigations demonstrated that near-water layers in coastal areas differ significantly from those over open seas both in terms of structure and physical properties. Taking into consideration the above mentioned factors, aerosol concentrations and optical properties were determined in the marine boundary layer as a function of offshore distance and altitude at various coastal sites in two seasons. The lidar results show that the remote sensing algorithms used currently in coastal areas need verification and are not fully reliable.

Tymon Zielinski; Bringfried Pflug

2007-01-01T23:59:59.000Z

387

Method And System For Examining Biological Materials Using Low Power Cw Excitation Raman Spectroscopy.  

DOE Patents (OSTI)

A method and system for examining biological materials using low-power cw excitation Raman spectroscopy. In accordance with the teachings of the invention, a low-power continuous wave (cw) pump laser beam and a low-power cw Stokes (or anti-Stokes) probe laser beam simultaneously illuminate a biological material and traverse the biological material in collinearity. The pump beam, whose frequency is varied, is used to induce Raman emission from the biological material. The intensity of the probe beam, whose frequency is kept constant, is monitored as it leaves the biological material. When the difference between the pump and probe excitation frequencies is equal to a Raman vibrational mode frequency of the biological material, the weak probe signal becomes amplified by one or more orders of magnitude (typically up to about 10.sup.4 -10.sup.6) due to the Raman emission from the pump beam. In this manner, by monitoring the intensity of the probe beam emitted from the biological material as the pump beam is varied in frequency, one can obtain an excitation Raman spectrum for the biological material tested. The present invention may be applied to in the in vivo and/or in vitro diagnosis of diabetes, heart disease, hepatitis, cancers and other diseases by measuring the characteristic excitation Raman lines of blood glucose, cholesterol, serum glutamic oxalacetic transaminase (SGOT)/serum glutamic pyruvic tansaminase (SGPT), tissues and other corresponding Raman-active body constituents, respectively. For example, it may also be used to diagnose diseases associated with the concentration of Raman-active constituents in urine, lymph and saliva It may be used to identify cancer in the breast, cervix, uterus, ovaries and the like by measuring the fingerprint excitation Raman spectra of these tissues. It may also be used to reveal the growing of tumors or cancers by measuring the levels of nitric oxide in tissue.

Alfano, Robert R. (Bronx, NY); Wang, Wubao (Flushing, NY)

2000-11-21T23:59:59.000Z

388

NIST LIDAR Distance Measurement Video Descriptive Text for ...  

Science Conference Proceedings (OSTI)

... planes . VISUAL: Animation of moving past planets in space. ... instruments . VISUAL: Animation of satellite orbiting the Earth. Newbury: ". ...

2011-10-25T23:59:59.000Z

389

Dual-Doppler Lidar Measurements for Improving Dispersion Models  

Science Conference Proceedings (OSTI)

Dispersion of pollutants in the urban atmosphere is a subject that is presently under much investigation. In this paper the variables used in turbulent dispersion and plume rise schemes of the Met Office Nuclear Accident Model (NAME) are ...

Chris G. Collier; Fay Davies; Karen E. Bozier; Anthony R. Holt; Doug R. Middleton; Guy N. Pearson; Stephan Siemen; Dave V. Willetts; Graham J. G. Upton; Rob I. Young

2005-06-01T23:59:59.000Z

390

Surface enhanced Raman scattering of aged graphene: Effects of annealing in vacuum  

SciTech Connect

In this paper, we report a simple method to recover the surface enhanced Raman scattering activity of aged graphene. The Raman signals of Rhodamine molecules absorbed on aged graphene are dramatically increased after vacuum annealing and comparable to those on fresh graphene. Atomic force microscopy measurements indicate that residues on aged graphene surface can efficiently be removed by vacuum annealing, which makes target molecule closely contact with graphene. We also find that the hole doping in graphene will facilitate charge transfer between graphene and molecule. These results confirm the strong Raman enhancement of target molecule absorbed on graphene is due to the charge transfer mechanism.

Wang Yingying; Li Aizhi; Qu Shiliang [Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209 (China); Ni Zhenhua; Zafar, Zainab; Qiu Teng [Department of Physics, Southeast University, Nanjing 211189 (China); Zhang Yan; Ni Zhonghua [Jiangsu Key Laboratory for Design and Fabrication of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189 (China); Yu Ting; Shen Zexiang [Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore)

2011-12-05T23:59:59.000Z

391

Raman spectroscopy on simple molecular systems at very high density  

DOE Green Energy (OSTI)

We present an overview of how Raman spectroscopy is done on simple molecular substances at high pressures. Raman spectroscopy is one of the most powerful tools for studying these substances. It is often the quickest means to explore changes in crystal and molecular structures, changes in bond strength, and the formation of new chemical species. Raman measurements have been made at pressures up to 200 GPa (2 Mbar). Even more astonishing is the range of temperatures (4-5200/degree/K) achieved in various static and dynamic (shock-wave) pressure experiments. One point we particularly wish to emphasize is the need for a good theoretical understanding to properly interpret and use experimental results. This is particularly true at ultra-high pressures, where strong crystal field effects can be misinterpreted as incipient insulator-metal transitions. We have tried to point out apparatus, techniques, and results that we feel are particularly noteworthy. We have also included some of the /open quotes/oral tradition/close quotes/ of high pressure Raman spectroscopy -- useful little things that rarely or never appear in print. Because this field is rapidly expanding, we discuss a number of exciting new techniques that have been informally communicated to us, especially those that seem to open new possibilities. 58 refs., 18 figs.

Schiferl, D.; LeSar, R.S.; Moore, D.S.

1988-01-01T23:59:59.000Z

392

Raman activity in synchronously dividing bacteria  

SciTech Connect

Using a spectrometer equipped with an optical-multichannel analyzer as the detector (OMA), we have observed the Stokes laser-Raman spectra of metabolically active Escherichia coli and Bacillus megaterium from 100 - 2100 cm/sup -1/. After lengthy investigation, no Raman lines attributable to the metabolic process nor the cells themselves were found. Previous Raman spectra of active bacteria cannot be used to support nonlinear theories in biology. 34 refs., 9 figs.

Layne, S.P.

1985-01-01T23:59:59.000Z

393

Studying Clouds and Aerosols with Lidar Depolarization Ratio and Backscatter Relationships  

E-Print Network (OSTI)

This dissertation consists of three parts, each devoted to a particular issue of significant importance for CALIPSO lidar observation of depolarization ratio (delta) and backscatter (gamma?) to improve current understanding of the microphysical properties of clouds and aerosols. The relationships between depolarization ratio and backscatter allow us to retrieve particle thermodynamic phase and shape and/or orientation of aerosols and clouds. The first part is devoted to the investigation of the relationships between lidar backscatter and the corresponding depolarization ratio for different cloud classifications and aerosol types. For each cloud and aerosol types, layer-averaged backscatter and backscattering depolarization ratio from the CALIPSO measurements are discussed. The present results demonstrate the unique capabilities of the CALIPSO lidar instrument for determining cloud phase and aerosols subtypes. In the second part, we evaluate the MODIS IR cloud phase with the CALIPSO cloud products. The three possible misclassifications of MODIS IR cloud phasealgorithm, which are studied by Nasiri and Kahn (2008) with radiative transfer modeling, are tested by comparing between MODIS IR phase and CALIOP observations. The current results support their hypotheses, which is that the MODIS phase algorithm may tend to classify thin cirrus clouds as water clouds or mixed phase clouds or unknown, and classify midlevel and/or mid-temperature clouds as mixed or unknown phase. In the third part, we present a comparison of mineral dust aerosol retrievals from two instruments, MODIS and CALIPSO lidar. And, we implement and evaluate a new mineral dust detection algorithm based on the analysis of thin dust radiative signature. In comparison, three commonly used visible and IR mineral dust detection algorithms, including BTD procedure, D parameter method, and multi-channel image algorithm, are evaluated with CALIPSO aerosol classification. The comparison reveals that those dust detection algorithms are not effective for optically thin dust layers, but for thick dust storm. The new algorithm using discriminant analysis with CALIPSO observation is much better in detecting thin dust layer of optical thickness between 0.1 and 2.

Cho, Hyoun-Myoung

2011-12-01T23:59:59.000Z

394

An approach to visualization of large data sets from LIDAR  

E-Print Network (OSTI)

Rapid development of laser scanning technology in past decades has resulted in a wide area of its applications. LI-DAR is a system that uses this technology to gather information about distant targets. Gathered data are stored into large data sets that are further processed, visualized and analyzed. Fast and accurate visualization is the key factor when working with LIDAR point clouds. The main problem that arises is that vast amount of data can easily exceed memory and processing capacities of modern day computers. In this paper we present an approach to visualization of large LIDAR point clouds in real time entirely on graphical processing unit using a point-based rendering technique. Our method is based on dynamic data loading and efficient two-pass rendering utilizing approximation of elliptical weighted average splatting with rotated splats. Expensive rendering tasks are delegated to programmable graphics unit to save CPU resources. The proposed system offers realistic visualization of LIDAR point clouds in real time that is visually and performance wise comparable to other solutions, while not requiring any comprehensive preprocessing such as TIN generation beforehand.

Bostjan Kovac

2009-01-01T23:59:59.000Z

395

Lidar investigation of atmosphere effect on a wind turbine wake  

Science Conference Proceedings (OSTI)

An experimental study of the spatial wind structure in the vicinity of a wind turbine by a NOAA coherent Doppler lidar has been conducted. It has been found out that a working wind turbine generates a wake with the maximum velocity deficit varying ...

I. N. Smalikho; V. A. Banakh; Y. L. Pichugina; W. A. Brewer; R. M. Banta; J. K. Lundquist; N. D. Kelley

396

Mobile Lidar Profiling of Tropical Aerosols and Clouds  

Science Conference Proceedings (OSTI)

Lidar profiling of atmospheric aerosols and clouds in the lower atmosphere has been in progress at the Indian Institute of Tropical Meteorology (IITM), Pune (18°32?N, 73°52?E, 559 m MSL), India, for more than two decades. To enlarge the scope of ...

P. C. S. Devara; P. E. Raj; K. K. Dani; G. Pandithurai; M. C. R. Kalapureddy; S. M. Sonbawne; Y. J. Rao; S. K. Saha

2008-08-01T23:59:59.000Z

397

Application of Short-Range Lidar in Wind Shear Alerting  

Science Conference Proceedings (OSTI)

Long-range lidar systems have been used operationally at the Hong Kong International Airport for wind shear alerting. They are used for monitoring the headwinds over the last 3 n mi of all of the runway corridors of the Hong Kong International ...

P. W. Chan; Y. F. Lee

2012-02-01T23:59:59.000Z

398

Extraction of Mangrove Biophysical Parameters Using Airborne LiDAR  

E-Print Network (OSTI)

Abstract: Tree parameter determinations using airborne Light Detection and Ranging (LiDAR) have been conducted in many forest types, including coniferous, boreal, and deciduous. However, there are only a few scientific articles discussing the application of LiDAR to mangrove biophysical parameter extraction at an individual tree level. The main objective of this study was to investigate the potential of using LiDAR data to estimate the biophysical parameters of mangrove trees at an individual tree scale. The Variable Window Filtering (VWF) and Inverse Watershed Segmentation (IWS) methods were investigated by comparing their performance in individual tree detection and in deriving tree position, crown diameter, and tree height using the LiDAR-derived Canopy Height Model (CHM). The results demonstrated that each method performed well in mangrove forests with a low percentage of crown overlap conditions. The VWF method yielded a slightly higher accuracy for mangrove parameter extractions from LiDAR data compared with the IWS method. This is because the VWF method uses an adaptive circular filtering window size based on an allometric relationship. As a result of the VWF method, the position

Wasinee Wannasiri; Masahiko Nagai; Kiyoshi Honda; Phisan Santitamnont; Poonsak Miphokasap

2013-01-01T23:59:59.000Z

399

Coplanar Doppler Lidar Retrieval of Rotors from T-REX  

Science Conference Proceedings (OSTI)

Dual-Doppler analysis of data from two coherent lidars during the Terrain-Induced Rotor Experiment (T-REX) allows the retrieval of flow structures, such as vortices, during mountain-wave events. The spatial and temporal resolution of this ...

Michael Hill; Ron Calhoun; H. J. S. Fernando; Andreas Wieser; Andreas Dörnbrack; Martin Weissmann; Georg Mayr; Robert Newsom

2010-03-01T23:59:59.000Z

400

Lidar Investigation of Atmosphere Effect on a Wind Turbine Wake  

Science Conference Proceedings (OSTI)

An experimental study of the spatial wind structure in the vicinity of a wind turbine by a NOAA coherent Doppler lidar has been conducted. It was found that a working wind turbine generates a wake with the maximum velocity deficit varying from 27% ...

I. N. Smalikho; V. A. Banakh; Y. L. Pichugina; W. A. Brewer; R. M. Banta; J. K. Lundquist; N. D. Kelley

2013-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Method And System For Examining Biological Materials Using Low Power Cw Excitation Raman Spectroscopy.  

DOE Patents (OSTI)

A method and system for examining biological materials using low-power cw excitation Raman spectroscopy. A low-power continuous wave (cw) pump laser beam and a low-power cw Stokes (or anti-Stokes) probe laser beam simultaneously illuminate a biological material and traverse the biological material in collinearity. The pump beam, whose frequency is varied, is used to induce Raman emission from the biological material. The intensity of the probe beam, whose frequency is kept constant, is monitored as it leaves the biological material. When the difference between the pump and probe excitation frequencies is equal to a Raman vibrational mode frequency of the biological material, the weak probe signal becomes amplified by one or more orders of magnitude (typically up to about 10.sup.4 -10.sup.6) due to the Raman emission from the pump beam. In this manner, by monitoring the intensity of the probe beam emitted from the biological material as the pump beam is varied in frequency, one can obtain an excitation Raman spectrum for the biological material tested. The present invention may be applied to in the in vivo and/or in vitro diagnosis of diabetes, heart disease, hepatitis, cancers and other diseases by measuring the characteristic excitation Raman lines of blood glucose, cholesterol, serum glutamic oxalacetic transaminase (SGOT)/serum glutamic pyruvic transaminase (SGPT), tissues and other corresponding Raman-active body constituents, respectively.

Alfano, Robert R. (Bronx, NY); Wang, Wubao (Flushing, NY)

2003-05-06T23:59:59.000Z

402

Raman spectroscopic studies of chemical speciation in calcium chloride melts  

DOE Green Energy (OSTI)

Raman spectroscopy was applied to CaCl2 melts at 900 degrees C under both non-electrolyzed and electrolyzed conditions. The later used titania cathodes supplied by TIMET, Inc. and graphite anodes. Use of pulse-gating to collect the Raman spectra successfully eliminated any interference from black-body radiation and other stray light. The spectrum of molten CaCl2 exhibited no distinct, resolvable bands that could be correlated with a calcium chloride complex similar to MgCl42- in MgCl2 melts. Rather, the low frequency region of the spectrum was dominated by a broad “tail” arising from collective oscillations of both charge and mass in the molten salt “network.” Additions of both CaO and Ca at concentrations of a percent or two resulted in no new features in the spectra. Addition of CO2, both chemically and via electrolysis at concentrations dictated by stability and solubility at 900 degrees C and 1 bar pressure, also produced no new bands that could be correlated with either dissolved CO2 or the carbonate ion. These results indicated that Raman spectroscopy, at least under the conditions evaluated in the research, was not well suited for following the reactions and coordination chemistry of calcium ions, nor species such as dissolved metallic Ca and CO2 that are suspected to impact current efficiency in titanium electrolysis cells using molten CaCl2. Raman spectra of TIMET titania electrodes were successfully obtained as a function of temperature up to 900 degrees C, both in air and in-situ in CaCl2 melts. However, spectra of these electrodes could only be obtained when the material was in the unreduced state. When reduced, either with hydrogen or within an electrolysis cell, the resulting electrodes exhibited no measurable Raman bands under the conditions used in this work.

Windisch, Charles F.; Lavender, Curt A.

2005-02-01T23:59:59.000Z

403

Modeling LIDAR Detection of Biological Aerosols to Determine Optimum Implementation Strategy  

Science Conference Proceedings (OSTI)

This report summarizes work performed for a larger multi-laboratory project named the Background Interferent Measurement and Standards project. While originally tasked to develop algorithms to optimize biological warfare agent detection using UV fluorescence LIDAR, the current uncertainties in the reported fluorescence profiles and cross sections the development of any meaningful models. It was decided that a better approach would be to model the wavelength-dependent elastic backscattering from a number of ambient background aerosol types, and compare this with that generated from representative sporulated and vegetative bacterial systems. Calculations in this report show that a 266, 355, 532 and 1064 nm elastic backscatter LIDAR experiment will allow an operator to immediately recognize when sulfate, VOC-based or road dust (silicate) aerosols are approaching, independent of humidity changes. It will be more difficult to distinguish soot aerosols from biological aerosols, or vegetative bacteria from sporulated bacteria. In these latter cases, the elastic scattering data will most likely have to be combined with UV fluorescence data to enable a more robust categorization.

Sheen, David M.; Aker, Pam M.

2007-09-19T23:59:59.000Z

404

Wide-area, Sub-decimetre Positioning for Airborne LiDAR Surveys Using  

E-Print Network (OSTI)

Airborne LiDAR surveys produce high-resolution, very accurate surface elevation models which are used for many applications in surveying and civil engineering, as well as for flood prevention and mitigation, monitoring coastal erosion and land subsidence, etc. The key to producing high quality elevation products is very precise geolocation and orientation (or “georeferencing”) of the LiDAR instrument at the times when the measurements are made, obtained with a combination of on-board GNSS and inertial sensors. The usual practice is to deploy reference GPS/GNSS land receivers in the area where the aircraft will be flying, and to obtain a precise trajectory by means of the short-baseline differential GNSS technique. This could mean installing and operating receivers at many sites during a flight mission if the area surveyed is a large one. In this paper, an example of an alternative approach will be presented: using as reference receivers those of a sparse network of Continuously Operating Reference Stations (CORS) in New South Wales known as CORSnet-NSW, and a wide-area GNSS technique for obtaining the aircraft trajectory with sub-decimetre accuracy even with baseline lengths of several hundred kilometres. This may be comparable in precision and accuracy to the short-baseline

Oscar L. Colombo; Shane Brunker; Glenn Jones; Volker Janssen

2009-01-01T23:59:59.000Z

405

A study on Raman Injection Laser  

E-Print Network (OSTI)

The Raman Injection Laser is a new type of laser which is based on triply resonant stimulated Raman scattering between quantum confined states within the active region of a Quantum Cascade Laser that serves as an internal optical pump. The Raman Injection Laser is driven electrically and no external laser pump is required. Triple resonance leads to an enhancement of orders of magnitude in the Raman gain, high conversion efficiency and low threshold. We studied this new type of laser and conclude some basic equations. With reasonable experimental parameters, we calculated the laser gain, losses and the output power of the Raman Injection Laser by using Mathematica and FEMLab. Finally we compared the theoretical and experimental results.

Liu, Debin

2005-08-01T23:59:59.000Z

406

LiDAR At Chocolate Mountains Area (Alm, Et Al., 2010) | Open Energy  

Open Energy Info (EERE)

LiDAR At Chocolate Mountains Area (Alm, Et Al., 2010) LiDAR At Chocolate Mountains Area (Alm, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: LiDAR At Chocolate Mountains Area (Alm, Et Al., 2010) Exploration Activity Details Location Chocolate Mountains Area Exploration Technique LiDAR Activity Date Usefulness useful DOE-funding Unknown Notes Recent exploration includes a high resolution aerial Li-DAR survey flown over the project areas, securing over 177,000 square kilometers of <30cm accuracy digital elevation data. LiDAR data were analyzed to characterize the active tectonic environment, and identify Holocene structures, which are common conduits for upwelling geothermal fluids. References Steve Alm, S. Bjornstad, M. Lazaro, A. Sabin1, D. Meade, J. Shoffner, W. C. Huang, J. Unruh, M. Strane, H. Ross (2010) Geothermal

407

ARM - Evaluation Product - MicroPulse LIDAR Cloud Optical Depth (MPLCOD)  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsMicroPulse LIDAR Cloud Optical Depth ProductsMicroPulse LIDAR Cloud Optical Depth (MPLCOD) Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : MicroPulse LIDAR Cloud Optical Depth (MPLCOD) 1999.05.01 - 2004.05.14 Site(s) SGP General Description The MPLCOD VAP retrieves the column cloud visible optical depth using LIDAR derived backscatter from the MPLNOR (Micro Pulse Lidar Normalized Backscatter) and radiosonde thermodynamic profiles. The optical depth retrieval is derived following Comstock et al. (2001), which retrieves visible optical depth and layer average backscatter-to-extinction ratio (k) at the lidar wavelength for each backscatter profile. Data Information Data Directory Contacts Principal Investigator Jennifer Comstock (509) 372-424

408

Comparison of temperature and humidity profiles with elastic-backscatter lidar data  

SciTech Connect

This contribution analyzes elastic-backscatter lidar data and temperature and humidity profiles from radiosondes acquired in Barcelona in July 1992. Elastic-backscatter lidar data reveal the distribution of aerosols within the volume of atmosphere scanned. By comparing this information with temperature and humidity profiles of the atmosphere at a similar time, we are able to asses de relationship among aerosol distribution and atmospheric stability or water content, respectively. Comparisons have shown how lidar`s revealed layers of aerosols correspond to atmospheric layers with different stability condition and water content.

Soriano, C. [Universidad Politecnica de Cataluna, Barcelona (Spain)]|[Los Alamos National Lab., NM (United States); Buttler, W.T. [Los Alamos National Lab., NM (United States); Baldasano, J.M. [Universidad Politecnica de Cataluna, Barcelona (Spain)

1995-04-01T23:59:59.000Z

409

Improving the Detection of Wind Features In Backscatter LIDAR Scans Using Feature Extraction.  

E-Print Network (OSTI)

??This thesis presents the results of applying image segmentation techniques to incoherent LIDAR data to improve the detection of wind features. Improving the detection and… (more)

Rotthoff, Eric

2012-01-01T23:59:59.000Z

410

Utilizzo di dati LIDAR per la correzione del Database Topografico della Regione Veneto.  

E-Print Network (OSTI)

??Utilizzo di dati Lidar per la correzione dle Database Topografico della Regione Veneto. Sviluppo procedura per la correzione della quota dei vertici delle geometrie DEL… (more)

Lunardi, Loris

2011-01-01T23:59:59.000Z

411

Assessing understorey structural characteristics in eucalypt forests: an investigation of LiDAR techniques.  

E-Print Network (OSTI)

??The potential of airborne LiDAR technology to quantify forest structure within eucalypt forests has been evaluated with a focus on the understorey stratum. To achieve… (more)

Goodwin, Nicholas R.

2006-01-01T23:59:59.000Z

412

LiDAR At Gabbs Valley Area (DOE GTP) | Open Energy Information  

Open Energy Info (EERE)

GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: LiDAR At Gabbs Valley Area (DOE GTP) Exploration Activity Details Location Gabbs Valley Area...

413

Structural Analysis of Southern Dixie Valley using LiDAR and...  

Open Energy Info (EERE)

Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle Aerial Photography, NAS Fallon Geothermal Exploration Project, Dixie Valley, Nevada Jump to: navigation, search...

414

An Accuracy Goal for a Comprehensive Satellite Wind Measuring System  

Science Conference Proceedings (OSTI)

Variational analysis with a geostrophic constraint is used to estimate a critical accuracy for a satellite lidar wind measuring system. This accuracy is such that the combination of satellite winds with satellite temperatures can produce analyses ...

Norman A. Phillips

1983-01-01T23:59:59.000Z

415

The Lidar System of the Pierre Auger Observatory  

E-Print Network (OSTI)

The Pierre Auger Observatory in Malargue, Argentina, is designed to study the origin of ultrahigh energy cosmic rays with energies above 10^18 eV. The energy calibration of the detector is based on a system of four air fluorescence detectors. To obtain reliable calorimetric information from the fluorescence stations, the atmospheric conditions at the experiment's site need to be monitored continuously during operation. One of the components of the observatory's atmospheric monitoring system is a set of four elastic backscatter lidar stations, one station at each of the fluorescence detector sites. This paper describes the design, current status, standard operation procedure, and performance of the lidar system of the Pierre Auger Observatory.

S. Y. BenZvi; R. Cester; M. Chiosso; B. M. Connolly; A. Filipcic; B. Garcia; A. Grillo; F. Guarino; M. Horvat; M. Iarlori; C. Macolino; J. A. J. Matthews; D. Melo; R. Mussa; M. Mostafa; J. Pallota; S. Petrera; M. Prouza; V. Rizi; M. Roberts; J. R. Rodriguez Rojo; F. Salamida; M. Santander; G. Sequeiros; A. Tonachini; L. Valore; D. Veberic; S. Westerhoff; D. Zavrtanik; M. Zavrtanik

2006-09-03T23:59:59.000Z

416

Tracking Honey Bees Using LIDAR (Light Detection and Ranging) Technology  

SciTech Connect

The Defense Advanced Research Projects Agency (DARPA) has recognized that biological and chemical toxins are a real and growing threat to troops, civilians, and the ecosystem. The Explosives Components Facility at Sandia National Laboratories (SNL) has been working with the University of Montana, the Southwest Research Institute, and other agencies to evaluate the feasibility of directing honeybees to specific targets, and for environmental sampling of biological and chemical ''agents of harm''. Recent work has focused on finding and locating buried landmines and unexploded ordnance (UXO). Tests have demonstrated that honeybees can be trained to efficiently and accurately locate explosive signatures in the environment. However, it is difficult to visually track the bees and determine precisely where the targets are located. Video equipment is not practical due to its limited resolution and range. In addition, it is often unsafe to install such equipment in a field. A technology is needed to provide investigators with the standoff capability to track bees and accurately map the location of the suspected targets. This report documents Light Detection and Ranging (LIDAR) tests that were performed by SNL. These tests have shown that a LIDAR system can be used to track honeybees. The LIDAR system can provide both the range and coordinates of the target so that the location of buried munitions can be accurately mapped for subsequent removal.

BENDER, SUSAN FAE ANN; RODACY, PHILIP J.; SCHMITT, RANDAL L.; HARGIS JR., PHILIP J.; JOHNSON, MARK S.; KLARKOWSKI, JAMES R.; MAGEE, GLEN I.; BENDER, GARY LEE

2003-01-01T23:59:59.000Z

417

Subsurface Ocean Signals from an Orbiting Polarization Lidar  

E-Print Network (OSTI)

Abstract: Detection of subsurface returns from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) on the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite were demonstrated. Despite the coarse range resolution of this aerosol lidar, evidence of subsurface scattering was observed as a delay and broadening of the cross-polarized signal relative to the co-polarized signal in the three near-surface range bins. These two effects contributed to an increased depolarization at the nominal depth of 25 m. These features were all correlated with near-surface chlorophyll concentrations. An increase in the depolarization was also seen at a depth of 50 m under certain conditions, suggesting that chlorophyll concentration at that depth could be estimated if an appropriate retrieval technique can be developed. At greater depths, the signal is dominated by the temporal response of the detectors, which was approximated by an analytical expression. The depolarization caused by aerosols in the atmosphere was calculated and eliminated as a possible artifact.

James H. Churnside; I J. Mccarty; Xiaomei Lu

2013-01-01T23:59:59.000Z

418

Building Extraction using LiDAR DEMs and IKONOS Images  

E-Print Network (OSTI)

An automated method for boundary representation of building objects has been considered as a core processor for 3D city modelling. Since the reconstruction of generic building shape fundamentally depends on geometric features extracted from data sources, it suffers difficulties especially when a monocular imagery with high scene complexity is solely used. The research described in this paper aims to develop an automated method for building extraction, in which individual building object is localized and boundaries of polyhedral building shape are delineated with a less specific building model. The developed technique focuses on an exploitation of synergy of Ikonos imagery combined with a LIDAR DEM. Individual buildings are localized with rectangle polygon by a hierarchical segmentation of LIDAR DEM and Ikonos multi-spectral information. This polygon is recursively partitioned by linear features extracted from Ikonos image and LIDAR space, which results in a set of convex polygons. Only polygons comprising “significant ” parts of building shape are verified and aggregated. Finally, polyhedral building shapes are reconstructed. Several results are presented with a discussion of evaluation and limitations of our method. 1.

G. Sohn; I. Dowman

2003-01-01T23:59:59.000Z

419

The Retrieval of Profiles of Particulate Extinction from Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) Data: Algorithm Description  

Science Conference Proceedings (OSTI)

This work describes the algorithms used for the fully automated retrieval of profiles of particulate extinction coefficients from the attenuated backscatter data acquired by the lidar on board the Cloud-Aerosol Lidar Infrared Pathfinder Satellite ...

Stuart A. Young; Mark A. Vaughan

2009-06-01T23:59:59.000Z

420

Comparison of High-Cloud Characteristics as Estimated by Selected Spaceborne Observations and Ground-Based Lidar Datasets  

Science Conference Proceedings (OSTI)

The characterization of high clouds as performed from selected spaceborne observations is assessed in this article by employing a number of worldwide ground-based lidar multiyear datasets as reference. Among the latter, the ground lidar ...

Artemio Plana-Fattori; Gérard Brogniez; Patrick Chervet; Martial Haeffelin; Olga Lado-Bordowsky; Yohann Morille; Frédéric Parol; Jacques Pelon; Antoine Roblin; Geneviève Sèze; Claudia Stubenrauch

2009-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

STRAT: An Automated Algorithm to Retrieve the Vertical Structure of the Atmosphere from Single-Channel Lidar Data  

Science Conference Proceedings (OSTI)

Today several lidar networks around the world provide large datasets that are extremely valuable for aerosol and cloud research. Retrieval of atmospheric constituent properties from lidar profiles requires detailed analysis of spatial and ...

Y. Morille; M. Haeffelin; P. Drobinski; J. Pelon

2007-05-01T23:59:59.000Z

422

ARM: ARSCL: cloud base height from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR  

DOE Data Explorer (OSTI)

ARSCL: cloud base height from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR

Richard Coulter; Kevin Widener; Nitin Bharadwaj; Karen Johnson; Timothy Martin

423

Raman fiber optic probe assembly for use in hostile environments  

DOE Patents (OSTI)

This invention provides a device for Raman spectroscopic measurement of composition and concentrations in a hostile environment by the use of a first fiber optic as a means of directing high intensity monochromatic light from a laser to the hostile environment and a second fiber optic to receive the lower intensity scattered light for transmittal to a monochromator for analysis. To avoid damage to the fiber optics, they are protected from the hostile environment. A preferred embodiment of the Raman fiber optic probe is able to obtain Raman spectra of corrosive gases and solutions at temperatures up to 600.degree. F. and pressures up to 2000 psi. The incident exciting fiber optic cable makes an angle of substantially 90.degree. with the collecting fiber optic cable. This 90.degree. geometry minimizes the Rayleigh scattering signal picked up by the collecting fiber, because the intensity of Rayleigh scattering is lowest in the direction perpendicular to the beam path of the exciting light and therefore a 90.degree. scattering geometry optimizes the signal to noise ratio.

Schmucker, John E. (Hurt, VA); Falk, Jon C. (Pittsburgh, PA); Archer, William B. (Bethel Park, PA); Blasi, Raymond J. (Harrison City, PA)

2000-01-01T23:59:59.000Z

424

Demonstration of a silicon raman laser  

E-Print Network (OSTI)

The need for low-cost photonic devices has stimulated significant amount of research in silicon photonics. One avenue of this research is building active devices based on nonlinear properties of silicon. Raman effect in silicon is an attractive way of realizing these devices. In the last few years, spontaneous and stimulated Raman scattering have been demonstrated in Silicon-on-insulator (SOI) waveguides, showing the possibility of active functionalities based

Bahram Jalali; Ozdal Boyraz; Dimitri Dimitropoulos; Varun Raghunathan

2004-01-01T23:59:59.000Z

425

Article Remote Sensing of Channels and Riparian Zones with a Narrow-Beam Aquatic-Terrestrial LIDAR  

E-Print Network (OSTI)

(EAARL) is a new technology for cross-environment surveys of channels and floodplains. EAARL measurements of basic channel geometry, such as wetted cross-sectional area, are within a few percent of those from control field surveys. The largest channel mapping errors are along stream banks. The LIDAR data adequately support 1D and 2D computational fluid dynamics models and frequency domain analyses by wavelet transforms. Further work is needed to establish the stream monitoring capability of the EAARL and the range of water quality conditions in which this sensor will accurately map river bathymetry.

Jim Mckean; Dave Nagel; Daniele Tonina; Philip Bailey; Charles Wayne Wright; Carolyn Bohn; Amar Nayeg

2009-01-01T23:59:59.000Z

426

Lidar Observations of Sea-Breeze and Land-Breeze Aerosol Structure on the Black Sea  

Science Conference Proceedings (OSTI)

This paper describes results of a lidar study of sea-breeze behavior near Akhtopol in the southeastern corner of Bulgaria. The lidar site was a few hundred meters from the western shore of the Black Sea. Analyses are presented of vertical cross ...

I. Kolev; O. Parvanov; B. Kaprielov; E. Donev; D. Ivanov

1998-10-01T23:59:59.000Z

427

An Automated Algorithm for Detection of Hydrometeor Returns in Micropulse Lidar Data  

Science Conference Proceedings (OSTI)

A cloud detection algorithm for a low power micropulse lidar is presented that attempts to identify all of the significant power returns from the vertical column above the lidar at all times. The main feature of the algorithm is construction of ...

E. E. Clothiaux; G. G. Mace; T. P. Ackerman; T. J. Kane; J. D. Spinhirne; V. S. Scott

1998-08-01T23:59:59.000Z

428

Airborne lidar surveys are an at-tractive alternative to the methods  

E-Print Network (OSTI)

to changing from a visual- based aerial survey (wide swath, shallow penetration) to a lidar-based Modeling264 Airborne lidar surveys are an at- tractive alternative to the methods presentlyusedinfishery-independent surveys of epipelagic fishes (Hunter and Churnside1). They would cost much less per survey mile than ship

429

Lidar Observations of the Fine-Scale Variability of Marine Stratocumulus Clouds  

Science Conference Proceedings (OSTI)

A Nd:YAG lidar system was flown aboard NASA's ER-2 high altitude aircraft. Observations of cloud top height were made with 70 m along-track and 7.5 m vertical-height resolution. The lidar data observed from an East Pacific stratocumulus cloud ...

Reinout Boers; James D. Spinhirne; William D. Hart

1988-07-01T23:59:59.000Z

430

Connected Components for a Fast and Robust 2D Lidar Data Segmentation  

Science Conference Proceedings (OSTI)

The paper presents a novel segmentation approach applied to a two-dimensional point-cloud extracted by a LIDAR device. The most common approaches perform well in outdoor environments where usually furniture and other objects are rather big and are composed ... Keywords: 2D Lidar Segmentation, Connected Component, Intelligent Vehicles, Point-cloud analysis, Unmanned Ground Vehicle

Daniel Oñoro Rubio, Artem Lenskiy, Jee-Hwan Ryu

2013-07-01T23:59:59.000Z

431

Three-Dimensional Mapping of Fluorescent Dye Using a Scanning, Depth-Resolving Airborne Lidar  

Science Conference Proceedings (OSTI)

Results are presented from a pilot study using a fluorescent dye tracer imaged by airborne lidar in the ocean surface layer on spatial scales of meters to kilometers and temporal scales of minutes to hours. The lidar used here employs a scanning, ...

M. A. Sundermeyer; E. A. Terray; J. R. Ledwell; A. G. Cunningham; P. E. LaRocque; J. Banic; W. J. Lillycrop

2007-06-01T23:59:59.000Z

432

Implementation of a lidar system and its usage in characterization of aerosols in the atmospheric column  

Science Conference Proceedings (OSTI)

Light Detection and Ranging (LIDAR) is a recent remote sensing system which has been gradually expanding as a network among the countries actively concerned about the atmospheric contaminants, earth radiation budget, rain variations, clean air index, ... Keywords: AERONET station, Lidar system, aerosol optical depth, aerosol size distribution, air quality index, planetary boundary layer

Javier Mèndez-Rodríguez; Hamed Parsiani

2009-06-01T23:59:59.000Z

433

Raman spectroscopic and mass spectrometric investigations of the hydrogen isotopes and isotopically labelled methane  

Science Conference Proceedings (OSTI)

Suitable analytical methods must be tested and developed for monitoring the individual process steps within the fuel cycle of a fusion reactor and for tritium accountability. The utility of laser-Raman spectroscopy accompanied by mass spectrometry with an Omegatron was investigated using the analysis of all hydrogen isotopes and isotopically labeled methanes as an example. The Omegatron is useful for analyzing all hydrogen isotopes mixed with the stable helium isotopes. The application of this mass spectrometer were demonstrated by analyzing mixtures of deuterated methanes. In addition, it was employed to study the radiochemical Witzbach exchange reaction between tritium and methanes. A laser-Raman spectrometer was designed for analysis of tritium-containing gases and was built from individual components. A tritium-compatible, metal-sealed Raman cuvette having windows with good optical properties and additional means for measuring the stray light was first used successfully in this work. The Raman spectra of the hydrogen isotopes were acquired in the pure rotation mode and in the rotation-vibration mode and were used for on. The deuterated methanes were measured by Raman spectroscopy, the wavenumbers determined were assigned to the corresponding vibrations, and the wavenumbers for the rotational fine-structure were summarized in tables. The fundamental Vibrations of the deuterated methanes produced Witzbach reactions were detected and assigned. The fundamental vibrations of the molecules were obtained with Raman spectroscopy for the first time in this work. The @-Raman spectrometer assembled is well suited for the analysis of tritium- containing gases and is practical in combination with mass spectrometry using an Omegatron, for studying gases used in fusion.

Jewett, J.R., Fluor Daniel Hanford

1997-02-24T23:59:59.000Z

434

Comparison of Airborne In Situ, Airborne Radar–Lidar, and Spaceborne Radar–Lidar Retrievals of Polar Ice Cloud Properties Sampled during the POLARCAT Campaign  

Science Conference Proceedings (OSTI)

This study illustrates the high potential of RALI, the French airborne radar–lidar instrument, for studying cloud processes and evaluating satellite products when satellite overpasses are available. For an Arctic nimbostratus ice cloud collected ...

Julien Delanoë; Alain Protat; Olivier Jourdan; Jacques Pelon; Mathieu Papazzoni; Régis Dupuy; Jean-Francois Gayet; Caroline Jouan

2013-01-01T23:59:59.000Z

435

Tunable infrared source employing Raman mixing  

SciTech Connect

A tunable source of infrared radiation is obtained by irradiating an assemblage of Raman active gaseous atoms or molecules with a high intensity pumping beam of coherent radiation at a pump frequency .omega..sub.p to stimulate the generation of Stokes wave energy at a Stokes frequency .omega..sub.s and to stimulate the Raman resonant mode at the Raman mode frequency .omega..sub.R within the irradiated assemblage where the pump frequency .omega..sub.p minus the Stokes frequency .omega..sub.s is equal to the Raman mode frequency .omega..sub.R. The stimulated assemblage is irradiated with a tunable source of coherent radiation at a frequency .omega..sub.i to generate the output infrared radiation of the frequency .omega..sub.0 which is related to the Raman mode frequency .omega..sub.R and the input wave .omega..sub.i by the relation .omega..sub.0 =.omega..sub.i .+-..omega..sub.R. In one embodiment the interaction between the pump wave energy .omega..sub.p and the tunable input wave energy .omega..sub.i is collinear and the ratio of the phase velocity mismatch factor .DELTA.k to the electric field exponential gain coefficient T is within the range of 0.1 to 5. In another embodiment the pump wave energy .omega..sub.p and the tunable input wave energy .omega..sub.i have velocity vectors k.sub.p and k.sub.i which cross at an angle to each other to compensate for phase velocity mismatches in the medium. In another embodiment, the Stokes wave energy .omega..sub.s is generated by pump energy .omega..sub.p in a first Raman cell and .omega..sub.s, .omega..sub.i and .omega..sub.p are combined in a second Raman mixing cell to produce the output at .omega..sub.i.

Byer, Robert L. (Stanford, CA); Herbst, Richard L. (Menlo Park, CA)

1980-01-01T23:59:59.000Z

436

AFM CHARACTERIZATION OF RAMAN LASER INDUCED DAMAGE ON CDZNTECRYSTAL SURFACES  

Science Conference Proceedings (OSTI)

High quality CdZnTe (or CZT) crystals have the potential for use in room temperature gamma-ray and X-ray spectrometers. Over the last decade, the methods for growing high quality CZT have improved the quality of the produced crystals however there are material features that can influence the performance of these materials as radiation detectors. The presence of structural heterogeneities within the crystals, such as twinning, pipes, grain boundaries (polycrystallinity), and secondary phases (SPs) can have an impact on the detector performance. There is considerable need for reliable and reproducible characterization methods for the measurement of crystal quality. With improvements in material characterization and synthesis, these crystals may become suitable for widespread use in gamma radiation detection. Characterization techniques currently utilized to test for quality and/or to predict performance of the crystal as a gamma-ray detector include infrared (IR) transmission imaging, synchrotron X-ray topography, photoluminescence spectroscopy, transmission electron microscopy (TEM), atomic force microscopy (AFM) and Raman spectroscopy. In some cases, damage caused by characterization methods can have deleterious effects on the crystal performance. The availability of non-destructive analysis techniques is essential to validate a crystal's quality and its ability to be used for either qualitative or quantitative gamma-ray or X-ray detection. The work presented herein discusses the damage that occurs during characterization of the CZT surface by a laser during Raman spectroscopy, even at minimal laser powers. Previous Raman studies have shown that the localized annealing from tightly focused, low powered lasers results in areas of higher Te concentration on the CZT surface. This type of laser damage on the surface resulted in decreased detector performance which was most likely due to increased leakage current caused by areas of higher Te concentration. In this study, AFM was used to characterize the extent of damage to the CZT crystal surface following exposure to a Raman laser. AFM data reveal localized surface damage and increased conductivity in the areas exposed to the Raman laser beam.

Teague, L.; Duff, M.

2008-10-07T23:59:59.000Z

437

Doppler lidar observations of Russian forest fire plumes over Helsinki  

E-Print Network (OSTI)

Russia led to elevated concentrations of fine particles reducing air quality in southern Finland over a number of weeks. Predominately easterly and south-easterly winds resulted in smoke plumes extending over the Gulf of Finland and affecting eastern and southern Finland during 7–14 August 2006 and 21–23 August 2006. This article describes observations using Doppler lidar of two episodes where smoke plumes from the Russian forest fires were evident over the Helsinki area on 7 and 9 August 2006. The observations were made during a convective field campaign, part of the Helsinki Testbed, an international mesoscale meteorology research project running from

K E Bozier; G N Pearson; C G Collier; Halo Photonics

2005-01-01T23:59:59.000Z

438

Combining LIDAR and IfSAR: What can you expect?  

E-Print Network (OSTI)

Three-dimensional mapping products in the form of DEMs (Digital Elevation Models) have become much more accessible in recent years, in part due to the implementation of LIDAR and IFSAR technologies. While there is considerable familiarity with one technology or the other, they are not often examined in terms of their mutually similar characteristics or equally those that are dissimilar. The purpose of this paper is to summarize those factors which will ultimately help to determine whether one technology or the other is appropriate for a particular application. We present two examples to illustrate and suggest that in many ways they can be viewed as complementary rather than competitive technologies.

Bryan Mercer Calgary

2001-01-01T23:59:59.000Z

439

Feasibility Study of Using High-Temperature Raman Spectroscopy for On-Line Monitoring and Product Control of the Glass Vitrification Process  

SciTech Connect

A pulse-gating Raman spectroscopy setup was developed in this project. The setup was capable of performing in-situ high-temperature Raman measurements for glasses at temperatures as high as 1412 C. In the literature, high-temperature Raman measurements have only been performed on thin films of glass to minimize black-body radiation effects. The pulse-gating Raman setup allows making high-temperature measurements for bulk melts while effectively minimizing black-body radiation effects. A good correlation was found between certain Raman characteristic parameters and glass melt temperature for sodium silicate glasses measured in this project. Comparisons were made between the high-temperature Raman data from this study and literature data. The results suggest that an optimization of the pulse-gating Raman setup is necessary to further improve data quality (i.e., to obtain data with a higher signal-to-noise ratio). An W confocal Raman microspectrometer with continuous wave laser excitation using a 325 nm excitation line was evaluated selectively using a transparent silicate glass ad a deep-colored high-level waste glass in a bulk quantity. The data were successfully collected at temperatures as high as approximately 1500 C. The results demonstrated that the UV excitation line can be used for high-temperature Raman measurements of molten glasses without black-body radiation interference from the melt for both transparent and deep-color glasses. Further studies are needed to select the best laser system that can be used to develop high-temperature Raman glass databases.

Windisch, C.F. Jr.; Piepel, G.F.; Li, H.; Elliott, M.L.; Su, Y.

1999-01-04T23:59:59.000Z

440

Nocturnal Low-Level-Jet-Dominated Atmospheric Boundary Layer Observed by a Doppler Lidar Over Oklahoma City during JU2003  

SciTech Connect

Boundary layer wind data observed by a Doppler lidar and sonic anemometers during the mornings of three intensive observational periods (IOP2, IOP3, and IOP7) of the Joint Urban 2003 (JU2003) field experiment are analyzed to extract the mean and turbulent characteristics of airflow over Oklahoma City, Oklahoma. A strong nocturnal low-level jet (LLJ) dominated the flow in the boundary layer over the measurement domain from midnight to the morning hours. Lidar scans through the LLJ taken after sunrise indicate that the LLJ elevation shows a gradual increase of 25-100 m over the urban area relative to that over the upstream suburban area. The mean wind speed beneath the jet over the urban area is about 10%-15% slower than that over the suburban area. Sonic anemometer observations combined with Doppler lidar observations in the urban and suburban areas are also analyzed to investigate the boundary layer turbulence production in the LLJ-dominated atmospheric boundary layer. The turbulence kinetic energy was higher over the urban domain mainly because of the shear production of building surfaces and building wakes. Direct transport of turbulent momentum flux from the LLJ to the urban street level was very small because of the relatively high elevation of the jet. However, since the LLJ dominated the mean wind in the boundary layer, the turbulence kinetic energy in the urban domain is correlated directly with the LLJ maximum speed and inversely with its height. The results indicate that the jet Richardson number is a reasonably good indicator for turbulent kinetic energy over the urban domain in the LLJ-dominated atmospheric boundary layer.

Wang, Yansen; Klipp, Cheryl L.; Garvey, Dennis M.; Ligon, David; Williamson, Chatt C.; Chang, Sam S.; Newsom, Rob K.; Calhoun, Ron

2007-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Real-TIme Raman Gas Composition Analyzer  

NLE Websites -- All DOE Office Websites (Extended Search)

Analyzer Analyzer Opportunity The Department of Energy's National Energy Technology Laboratory (NETL) is seeking collaborative research partners interested in implementing United States Provisional Patent Application entitled "Gas Sensing System Employing Raman Scattering". Disclosed in this application is a gas analyzing sensor that characterizes gaseous fuel, exhaust gases, or other process gas streams. The sensor reports concentrations of all majority gases at better than 0.3% accuracy in 1 second or less, and can be used for real-time gas analysis and system control. The sensor relies on novel techniques to enhance usually weak spontaneous Raman emissions from sample gases, enabling the application of Raman spectroscopy to rapid gas analysis. No commercially available sensor or sensing

442

Remote Adjustable focus Raman Spectroscopy Probe  

DOE Patents (OSTI)

A remote adjustable focus Raman spectroscopy probe allows for analyzing Raman scattered light from a point of interest external to the probe. An environmental barrier including at least one window separates the probe from the point of interest. An optical tube is disposed adjacent to the environmental barrier and includes along working length compound lens objective next to the window. A beam splitter and a mirror are at the other end. A mechanical means is used to translate the probe body in the X, Y, and Z directions resulting in a variable focus optical apparatus. Laser light is reflected by the beam splitter and directed toward the compound lens objective, then through the window and focused on the point of interest. Raman scattered light is then collected by the compound lens objective and directed through the beam splitter to a mirror. A device for analyzing the light, such as a monochrometer, is coupled to the mirror.

Schmucker, John E.; Blasi, Raymond J.; Archer, William B.

1998-07-28T23:59:59.000Z

443

Remote adjustable focus Raman spectroscopy probe  

DOE Patents (OSTI)

A remote adjustable focus Raman spectroscopy probe allows for analyzing Raman scattered light from a point of interest external probe. An environmental barrier including at least one window separates the probe from the point of interest. An optical tube is disposed adjacent to the environmental barrier and includes a long working length compound lens objective next to the window. A beam splitter and a mirror are at the other end. A mechanical means is used to translated the prove body in the X, Y, and Z directions resulting in a variable focus optical apparatus. Laser light is reflected by the beam splitter and directed toward the compound lens objective, then through the window and focused on the point of interest. Raman scattered light is then collected by the compound lens objective and directed through the beam splitter to a mirror. A device for analyzing the light, such as a monochrometer, is coupled to the mirror.

Schmucker, John E. (Hurt, VA); Blasi, Raymond J. (Harrison City, PA); Archer, William B. (Bethel Park, PA)

1999-01-01T23:59:59.000Z

444

Raman Shift of Stressed Diamond Anvils: Pressure Calibration and Culet Geometry Dependence  

DOE Green Energy (OSTI)

The pressure dependence of the Raman shift of diamond for highly stressed anvils at the diamond-anvil sample interface has been measured for different culet shapes up to 180 GPa at ambient temperature. By using hydrogen samples, which constitute both a quasi-hydrostatic medium and a sensitive pressure sensor, some of the effects of culet and tip size have been determined. We propose that the divergent results in the literature can be partly ascribed to different anvil geometries. Experiments show increasing second order dependence of the diamond Raman shift with pressure for decreasing tip size. This is an important consideration when using the diamond anvils as a pressure sensor.

Baer, B J; Chang, M E; Evans, W J

2008-04-03T23:59:59.000Z

445

LIGHT INDUCED TELLURIUM ENRICHMENT ON CDZNTE CRYSTALSURFACES DETECTED BY RAMAN SPECTROSCOPY  

Science Conference Proceedings (OSTI)

Synthetic CdZnTe or 'CZT' crystals can be grown under controlled conditions to produce high quality crystals to be used as room temperature radiation detectors. Even the best crystal growth methods result in defects, such as tellurium secondary phases, that affect the crystal's performance. In this study, CZT crystals were analyzed by micro Raman spectroscopy. The growth of Te rich areas on the surface was induced by low powered lasers. The growth was observed versus time with low power Raman scattering and was observed immediately under higher power conditions. The detector response was also measured after induced Te enrichment.

Hawkins, S; Eliel Villa-Aleman, E; Martine Duff, M; Douglas02 Hunter, D

2007-10-29T23:59:59.000Z

446

Light-Induced Tellurium Enrichment on CdZnTe Crystal Surfaces Detected by Raman Spectroscopy  

Science Conference Proceedings (OSTI)

CdZnTe (CZT) crystals can be grown under controlled conditions to produce high-quality crystals to be used as room-temperature radiation detectors. Even the best crystal growth methods result in defects, such as tellurium secondary phases, that affect the crystal's performance. In this study, CZT crystals were analyzed by micro-Raman spectroscopy. The growth of Te rich areas on the surface was induced by low-power lasers. The growth was observed versus time with low-power Raman scattering and was observed immediately under higher-power conditions. The detector response was also measured after induced Te enrichment.

Hawkins, Samantha A.; Villa-Aleman, Eliel; Duff, Martine C.; Hunter, Doug B.; Burger, Arnold; Groza, Michael; Buliga, Vladimir; Black, David R. (SRNL); (NIST); (Fisk U)

2008-12-08T23:59:59.000Z

447

Novel gold cantilever for nano-Raman spectroscopy of graphene  

Science Conference Proceedings (OSTI)

This paper presents the simultaneous topographical and tip-enhanced Raman imaging of single layer and multilayer graphene flakes. The probe tips suitable for tapping mode atomic force microscopy (AFM) and tip-enhanced Raman spectroscopy have been fabricated ... Keywords: Atomic force microscopy, Graphene, Nano-Raman, Tip-enhanced

Valentinas Snitka; Raul D. Rodrigues; Vitas Lendraitis

2011-08-01T23:59:59.000Z

448

Characterization of Upper-Troposphere Water Vapor Measurements during AFWEX Using LASE  

Science Conference Proceedings (OSTI)

Water vapor mass mixing ratio profiles from NASA's Lidar Atmospheric Sensing Experiment (LASE) system acquired during the Atmospheric Radiation Measurement (ARM)–First International Satellite Cloud Climatology Project (ISCCP) Regional Experiment (...

R. A. Ferrare; E. V. Browell; S. Ismail; S. A. Kooi; L. H. Brasseur; V. G. Brackett; M. B. Clayton; J. D. W. Barrick; G. S. Diskin; J. E. M. Goldsmith; B. M. Lesht; J. R. Podolske; G. W. Sachse; F. J. Schmidlin; D. D. Turner; D. N. Whiteman; D. Tobin; L. M. Miloshevich; H. E. Revercomb; B. B. Demoz; P. Di Girolamo

2004-12-01T23:59:59.000Z

449

An Airborne Laser Air Motion Sensing System. Part II: Design Criteria and Measurement Possibilities  

Science Conference Proceedings (OSTI)

A conically scanning Doppler lidar technique for measuring air motions from an aircraft is proposed in the companion paper (Keeler et al.). A theoretical analysis of this technique shows that, assuming isotropic turbulence, the technique is ...

Leif Kristensen; Donald H. Lenschow

1987-03-01T23:59:59.000Z

450

LASE Measurements of Water Vapor, Aerosol, and Cloud Distributions in Saharan Air Layers and Tropical Disturbances  

Science Conference Proceedings (OSTI)

The Lidar Atmospheric Sensing Experiment (LASE) on board the NASA DC-8 measured high-resolution profiles of water vapor and aerosols, and cloud distributions in 14 flights over the eastern North Atlantic during the NASA African Monsoon ...

Syed Ismail; Richard A. Ferrare; Edward V. Browell; Gao Chen; Bruce Anderson; Susan A. Kooi; Anthony Notari; Carolyn F. Butler; Sharon Burton; Marta Fenn; Jason P. Dunion; Gerry Heymsfield; T. N. Krishnamurti; Mrinal K. Biswas

2010-04-01T23:59:59.000Z

451

The Effect of a C02 Laser Pulse Shape on the Accuracy of DIAL Measurements  

Science Conference Proceedings (OSTI)

The temporal pulse shape varies at different wavelengths, within the same wavelength, and between identical lasers. In differential absorption lidar (DIAL) measurements the variance introduced into the deduced average pathlength concentration ...

Avishai Ben-David; Alan P. Force; Francis M. D'Amico; Silvio L. Emery

1992-10-01T23:59:59.000Z

452

Comparison of Infrared Atmospheric Brightness Temperatures Measured by a Fourier Transform Spectrometer and a Filter Radiometer  

Science Conference Proceedings (OSTI)

Increased interest in using atmospheric brightness temperature measurements from simple infrared radiometers combined with radars and lidars has prompted the investigation of their accuracy for various sky conditions. In comparisons of ...

Joseph A. Shaw; Jack B. Snider; James H. Churnside; Mark D. Jacobson

1995-10-01T23:59:59.000Z

453

Quantifying and relating land-surface and subsurface variability in permafrost environments using lidar and surface geophsical datasets  

Science Conference Proceedings (OSTI)

The complexity of permafrost dynamics and its critical impact on climate feedbacks warrant continued development of advanced high-latitude terrestrial ecosystem characterization and monitoring approaches. In this study, we explore the value of remote sensing and surface geophysical data for characterizing land surface and subsurface properties and their linkages in an Alaskan Coastal Plain ecosystem. We base our study on data collected at the end of the 2011 growing season in the Barrow Environmental Observatory, where a nested suite of measurements were collected within a polygon-dominated region including: surface ground penetrating radar, electromagnetic, and electrical resistance tomography data; thaw depth, soil temperature and moisture content, soil texture, soil carbon and nitrogen content, and major and trace cations. Previously-collected lidar data were also available for the study. Analysis of the datasets, individually and in combination, revealed the utility of the methods for characterizing critical land-surface and subsurface properties and associated spatial zonation. Lidar analysis was performed to extract geomorphic metrics (such as slope, curvature, and directed distance of polygons), which potentially indicate drainage potential and permafrost deformation state. Cluster analysis of these lidar-obtained attributes suggested that the land surface can be grouped into three spatially coherent zones, each having a dominant geomorphic expression including: a high centered polygon zone, a low centered polygon zone and a transitional zone. Comparison of the geophysical attributes from radar, electrical resistance tomography, and electromagnetic data with point measurements suggests that the surface geophysical data can provide very high-resolution information about subsurface properties that affect ecosystem feedbacks to climate, such as thaw depth and moisture content. Cluster analysis suggested that the geophysical attributes also varied spatially in a systematic way, suggesting the presence of three laterally distinct subsurface zones. Analysis of zone-based subsurface point measurements suggests that the geophysically-defined zones have unique distributions of hydrological, thermal, and geochemical properties and that the subsurface (geophysically-based) and land-surface (lidar-based) zonation is consistent. Although the close linkage between land surface (polygonal geomorphology) and subsurface (active layer) variability revealed through our study is not surprising, to our knowledge this is the first study to document such relationships using high resolution and non-invasive approaches. This study suggests the potential of using coincident lidar and surface geophysical measurements to quantify land surface and subsurface properties (respectively) and their linkages, which are likely to play a role in terrestrial ecosystem evolution and feedbacks to climate. These findings open the way for future research focused on using combined geophysical and remote sensing datasets to estimate subsurface and land-surface properties in high resolution and over large regions as is needed for process understanding and numerical model initialization in high latitude terrestrial ecosystems.

Hubbard, Susan S [Lawrence Berkeley National Laboratory (LBNL); Gangodagmage, C [Los Alamos National Laboratory (LANL); Dafflon, B [Lawrence Berkeley National Laboratory (LBNL); Wainwright, H [Lawrence Berkeley National Laboratory (LBNL); Peterson, J [Lawrence Berkeley National Laboratory (LBNL); Gusmeroli, A [University of Alaska, Fairbanks; Ulrich, Craig [Lawrence Berkeley National Laboratory (LBNL); Wu, Yuxin [Lawrence Berkeley National Laboratory (LBNL); Wilson, Cathy [Los Alamos National Laboratory (LANL); Rowland, J [Los Alamos National Laboratory (LANL); Tweedie, Craig [University of Texas, El Paso; Wullschleger, Stan D [ORNL

2013-01-01T23:59:59.000Z

454

Stokes injected Raman capillary waveguide amplifier  

DOE Patents (OSTI)

A device for producing stimulated Raman scattering of CO.sub.2 laser radiation by rotational states in a diatomic molecular gas utilizing a Stokes injection signal. The system utilizes a cryogenically cooled waveguide for extending focal interaction length. The waveguide, in conjunction with the Stokes injection signal, reduces required power density of the CO.sub.2 radiation below the breakdown threshold for the diatomic molecular gas. A Fresnel rhomb is employed to circularly polarize the Stokes injection signal and CO.sub.2 laser radiation in opposite circular directions. The device can be employed either as a regenerative oscillator utilizing optical cavity mirrors or as a single pass amplifier. Additionally, a plurality of Raman gain cells can be staged to increase output power magnitude. Also, in the regenerative oscillator embodiment, the Raman gain cell cavity length and CO.sub.2 cavity length can be matched to provide synchronism between mode locked CO.sub.2 pulses and pulses produced within the Raman gain cell.

Kurnit, Norman A. (Santa Fe, NM)

1980-01-01T23:59:59.000Z

455

Subvisual-Thin Cirrus Lidar Dataset for Satellite Verification and Climatological Research  

Science Conference Proceedings (OSTI)

A polarization (0.694-?m wavelength) lidar dataset for subvisual and thin (bluish-colored) cirrus clouds is drawn from Project FIRE (First ISCCP Regional Experiment) extended time observations. The clouds are characterized by their day–night ...

Kenneth Sassen; Byung Sung Cho

1992-11-01T23:59:59.000Z

456

A Comparison of Mixing Depths Observed by Ground-Based Wind Profilers and an Airborne Lidar  

Science Conference Proceedings (OSTI)

The authors compare the mixing depths in the daytime convective boundary layers that were observed remotely by wind profilers and an airborne lidar during the 1995 Southern Oxidants Study. The comparison is used to determine whether the mixing ...

A. B. White; C. J. Senff; R. M. Banta

1999-05-01T23:59:59.000Z

457

LiDAR At Twenty-Nine Palms Area (Page, Et Al., 2010) | Open Energy  

Open Energy Info (EERE)

Twenty-Nine Palms Area (Page, Et Al., 2010) Twenty-Nine Palms Area (Page, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: LiDAR At Twenty-Nine Palms Geothermal Area (Page, Et Al., 2010) Exploration Activity Details Location Twenty-Nine Palms Geothermal Area Exploration Technique LiDAR Activity Date Usefulness useful DOE-funding Unknown Notes Primary LiDAR application to this project was Airborne Laser Swath Mapping (ALSM). This particular application was used to gather data over a specific land area then used to create a Digital Elevation Model (DEM) with a resolution of approximately 1m in the horizontal direction and 10cm in the vertical direction. The LiDAR data gathered for MCAGCC was analyzed in conjunction with other data, such as aerial photography and field

458

Retrieval of Microscale Wind and Temperature Fields from Single- and Dual-Doppler Lidar Data  

Science Conference Proceedings (OSTI)

Dual-Doppler lidar observations are used to assess the accuracy of single-Doppler retrievals of microscale wind and temperature fields in a shear-driven convective boundary layer. The retrieval algorithm, which is based on four-dimensional ...

Rob K. Newsom; David Ligon; Ron Calhoun; Rob Heap; Edward Cregan; Marko Princevac

2005-09-01T23:59:59.000Z

459

Backscatter Lidar Observations of Lower Tropospheric Dynamics during Southern California Wildfires  

Science Conference Proceedings (OSTI)

Wavelike features suggesting gravity waves were revealed by lidar observations (from El Segundo, California) of smoke layers produced by large wildfires in the Southern California region during a Santa Ana event. Unique features of the ...

Steven Beck; David Stoker; James Hecht; Richard Walterscheid

2009-07-01T23:59:59.000Z

460

Two-Dimensional Vector Wind Fields from Volume Imaging Lidar Data  

Science Conference Proceedings (OSTI)

Spatially resolved wind fields are derived by cross correlation of aerosol backscatter data from horizontal and vertical scans of the University of Wisconsin volume imaging lidar during the 1997/98 Lake-Induced Convection Experiment. Data from ...

Shane D. Mayor; Edwin W. Eloranta

2001-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Lagrangian Coherent Structure Analysis of Terminal Winds Detected by Lidar. Part I: Turbulence Structures  

Science Conference Proceedings (OSTI)

The accurate real-time detection of turbulent airflow patterns near airports is important for safety and comfort in commercial aviation. In this paper, a method is developed to identify Lagrangian coherent structures (LCS) from horizontal lidar ...

Wenbo Tang; Pak Wai Chan; George Haller

2011-02-01T23:59:59.000Z

462

Simulation of Coherent Doppler Lidar Performance for Space-Based Platforms  

Science Conference Proceedings (OSTI)

The performance of coherent Doppler lidar velocity estimates for a space-based platform are produced using computer simulations of raw data and statistical descriptions of the resulting velocity estimates. The random spatial variability of the ...

Rod Frehlich

2000-02-01T23:59:59.000Z

463

Weather and Climate Needs for Lidar Observations from Space and Concepts for Their Realization  

Science Conference Proceedings (OSTI)

The spectrum of weather and climate needs for lidar observations from space is dismissed This paper focuses mainly on the requirements for winds, temperature, moisture, and pressure. Special emphasis is given to the needs for wind observations ...

David Atlas; C. Lawrence Korb

1981-09-01T23:59:59.000Z

464

Power Ratio Estimation in Incoherent Backscatter Lidar: Heterodyne Receiver with Square Law Detection  

Science Conference Proceedings (OSTI)

Comparative return irradiance estimation in a two channel heterodyne lidar receiver should be facilitated by processing finite data samples obtained in a period short compared with that of atmospheric fluctuations affecting beam propagation. Here ...

B. J. Rye

1983-11-01T23:59:59.000Z

465

Virtual Towers Using Coherent Doppler Lidar during the Joint Urban 2003 Dispersion Experiment  

Science Conference Proceedings (OSTI)

During the Joint Urban 2003 (JU2003) atmospheric field experiment in Oklahoma City, Oklahoma, of July 2003, lidar teams from Arizona State University and the Army Research Laboratory collaborated to perform intersecting range–height indicator ...

R. Calhoun; R. Heap; M. Princevac; R. Newsom; H. Fernando; D. Ligon

2006-08-01T23:59:59.000Z

466

High-Resolution Doppler Lidar Observations of Transient Downslope Flows and Rotors  

Science Conference Proceedings (OSTI)

The authors present observations of the temporal evolution of downslope windstorms with rotors and internal hydraulic jumps of unprecedented detail and spatiotemporal coverage. The observations were carried out by means of a coherent Doppler lidar ...

Christian Kühnlein; Andreas Dörnbrack; Martin Weissmann

2013-10-01T23:59:59.000Z

467

Remote Sounding of High Clouds. III: Monte Carlo Calculations of Multiple-Scattered Lidar Returns  

Science Conference Proceedings (OSTI)

Monte Carlo calculations of multiple-scattered contributions to the total energy received in a lidar beam have been made for a representative cirrus ice-cloud scattering phase function. The phase function is varied arbitrarily near the back ...

C. M. R. Platt

1981-01-01T23:59:59.000Z

468

Coincident Lidar and Aircraft Observations of Entrainment into Thermals and Mixed Layers  

Science Conference Proceedings (OSTI)

Coincident observations of the daytime convective boundary layer over Oklahoma were made with the NCAR Queen Air aircraft and the University of Wisconsin ground-based lidar. The two data sets have been merged to provide a unique visual ...

Timothy D. Crum; Roland B. Stull; Edwin W. Eloranta

1987-07-01T23:59:59.000Z

469

Semiempirical Model for the Reliability of a Matched Filter Frequency Estimator for Doppler Lidar  

Science Conference Proceedings (OSTI)

The author proposes a heuristic semiempirical model for predicting the reliability of a matched-filter frequency estimator applied to Doppler lidar signals. The model is tuned by a single coefficient ? empirically related to the ratio of the ...

Alain Dabas

1999-01-01T23:59:59.000Z

470

Modeling the Aerosol Extinction versus Backscatter Relationship for Lidar Applications: Maritime and Continental Conditions  

Science Conference Proceedings (OSTI)

A model to derive functional relationships linking extinction (?) and backscatter (?) of continental and maritime aerosol at 532 nm is presented and tested. These relationships are needed to solve the single-wavelength lidar equation, where both ...

Francesca Barnaba; Gian Paolo Gobbi

2004-03-01T23:59:59.000Z

471

The Experimental Cloud Lidar Pilot Study (ECLIPS) for Cloud—Radiation Research  

Science Conference Proceedings (OSTI)

The Experimental Cloud Lidar Pilot Study (ECLIPS) was initiated to obtain statistics on cloud-base height, extinction, optical depth, cloud brokenness, and surface fluxes. Two observational phases have taken place, in October-December 1989 and ...

C. M. Platt; S. A. Young; A. I. Carswell; S. R. Pal; M. P. McCormick; D. M. Winker; M. DelGuasta; L. Stefanutti; W. L. Eberhard; M. Hardesty; P. H. Flamant; R. Valentin; B. Forgan; G. G. Gimmestad; H. Jäger; S. S. Khmelevtsov; I. Kolev; B. Kaprieolev; Da-ren Lu; K. Sassen; V. S. Shamanaev; O. Uchino; Y. Mizuno; U. Wandinger; C. Weitkamp; A. Ansmann; C. Wooldridge

1994-09-01T23:59:59.000Z

472

Cloud Signals from Lidar and Rotating Beam Ceilometer Compared with Pilot Ceiling  

Science Conference Proceedings (OSTI)

Cloud signals from a vertically pointing, range-corrected ruby lidar and a rotating beam ceilometer showed excellent agreement in the height at which peak signal occurred. However, pilot reports of ceiling were at significantly lower altitude ...

W. L. Eberhard

1986-09-01T23:59:59.000Z

473

Finding Boundary Layer Top: Application of a Wavelet Covariance Transform to Lidar Backscatter Profiles  

Science Conference Proceedings (OSTI)

Several recent studies have utilized a Haar wavelet covariance transform to provide automated detection of the boundary layer top from lidar backscatter profiles by locating the maximum in the covariance profiles. This approach is effective where ...

Ian M. Brooks

2003-08-01T23:59:59.000Z

474

Evaluating Light Rain Drop Size Estimates from Multi-Wavelength Micropulse Lidar Network Profiling  

Science Conference Proceedings (OSTI)

We investigate multi-wavelength retrievals of median equivolumetric drop diameter, D0, suitable for drizzle and light rain, through collocated 355/527 nm Micro Pulse Lidar NETwork (MPLNET) observations collected during precipitation occurring 9 ...

Simone Lolli; Ellsworth J. Welton; James. R. Campbell

475

Remote sensing of atmospheric particles using LIDAR, Calipso satellite, & AERONET: algorithm development  

Science Conference Proceedings (OSTI)

Algorithms have been developed for the determination of essential parameters such as Aerosol Size Distribution, Angstrom coefficient, and Single Scattering Albedo necessary in the determination of regional climatological model and weather prediction ... Keywords: AERONET, Calipso, atmospheric parameters, lidar, remote sensing

Javier Mèndez; Hamed Parsiani; Emmanuel Sanchez

2009-01-01T23:59:59.000Z

476

Airborne Doppler Lidar Investigation of Sea Surface Reflectance at a 355-nm Ultraviolet Wavelength  

Science Conference Proceedings (OSTI)

The analysis of the sea surface reflectance for different incidence angles based on observations of an airborne Doppler lidar at an ultraviolet wavelength of 355 nm is described. The results were compared to sea surface reflectance models, ...

Zhigang Li; Christian Lemmerz; Ulrike Paffrath; Oliver Reitebuch; Benjamin Witschas

2010-04-01T23:59:59.000Z

477

Observations of Typhoon Melissa during the Lidar In-Space Technology Experiment (LITE)  

Science Conference Proceedings (OSTI)

The Lidar In-Space Technology Experiment (LITE) provided the first high-resolution (15 m) vertical profiling of clouds and aerosols from space. The LITE instrument flew aboard the space shuttle as its prime payload during Space Transportation ...

Thomas A. Kovacs; M. Patrick McCormick

2003-07-01T23:59:59.000Z

478

High-Resolution Doppler Lidar for Boundary Layer and Cloud Research  

Science Conference Proceedings (OSTI)

The high-resolution Doppler lidar (HRDL) was developed to provide higher spatial, temporal, and velocity resolution and more reliable performance than was previously obtainable with CO2-laser-based technology. The improved performance is needed ...

Christian J. Grund; Robert M. Banta; Joanne L. George; James N. Howell; Madison J. Post; Ronald A. Richter; Ann M. Weickmann

2001-03-01T23:59:59.000Z

479

The Use of Direct Observations over the Aerosol Particle Size Distribution for Inverting Lidar Data  

Science Conference Proceedings (OSTI)

The work is concerned with the inversion of horizontal lidar data into the aerosol particle size distribution (APSD). The aerosol is assumed to consist of spherical particles of continental and oceanic origin. The particular refraction index is ...

Kusiel S. Shifrin; Ilia G. Zolotov

2003-10-01T23:59:59.000Z

480

Major Advances Foreseen in Humidity Profiling from the Water Vapour Lidar Experiment in Space (WALES)  

Science Conference Proceedings (OSTI)

The need for an absolute standard for water vapor observations, in the form of a global dataset with high accuracy and good spatial resolution, has long been recognized. The European Space Agency's Water Vapour Lidar Experiment in Space (WALES) ...

É Gérard; D. G. H. Tan; L. Garand; V. Wulfmeyer; G. Ehret; P. Di Girolamo

2004-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar measurements" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Derivation of Effective Aerodynamic Surface Roughness in Urban Areas from Airborne Lidar Terrain Data  

Science Conference Proceedings (OSTI)

An automated technique was developed that uses only airborne lidar terrain data to derive the necessary parameters for calculation of effective aerodynamic surface roughness in urban areas. The technique provides parameters for geometric models ...

Donald E. Holland; Judith A. Berglund; Joseph P. Spruce; Rodney D. McKellip

2008-10-01T23:59:59.000Z

482

The Polarization Lidar Technique for Cloud Research: A Review and Current Assessment  

Science Conference Proceedings (OSTI)

The development of the polarization lidar field over the past two decades is reviewed, and the current cloud-research capabilities and limitations are evaluated. Relying on fundamental scattering principles governing the interaction of polarized ...

Kenneth Sassen

1991-12-01T23:59:59.000Z

483

Polarization Lidar and Synoptic Analyses of an Unusual Volcanic Aerosol Cloud  

Science Conference Proceedings (OSTI)

Over an unusually brief three-day period in early August 1989, spectacular twilight effects indicative of a stratospheric volcanic cloud were seen at Salt Lake City, Utah. Concurrent polarization lidar observations detected an aerosol layer at ...

Kenneth Sassen; John D. Horel

1990-12-01T23:59:59.000Z

484

Applications of an Infrared Doppler Lidar in Detection of Wind Shear  

Science Conference Proceedings (OSTI)

In December 2005, operational wind shear alerting at the Hong Kong International Airport (HKIA) reached an important milestone with the launch of the automatic Lidar (light detection and ranging) Windshear Alerting System (LIWAS). This signifies ...

C. M. Shun; P. W. Chan

2008-05-01T23:59:59.000Z

485

A Comparison of Cloud Cover Statistics from the GLAS Lidar with HIRS  

Science Conference Proceedings (OSTI)

The cloud dataset from the Geoscience Laser Altimeter System (GLAS) lidar on the Ice, Cloud, and Land Elevation Satellite (ICESat) spacecraft is compared to the cloud analysis of the Wisconsin NOAA High Resolution Infrared Radiation Sounder (HIRS)...

Donald Wylie; Edwin Eloranta; James D. Spinhirne; Steven P. Palm

2007-10-01T23:59:59.000Z

486

Analysis of full waveform LIDAR data for the classification of deciduous and coniferous trees  

Science Conference Proceedings (OSTI)

The paper describes a methodology for tree species classification using features that are derived from small-footprint full waveform Light Detection and Ranging (LIDAR) data. First, 3-dimensional coordinates of the laser beam reflections, the intensity, ...

J. Reitberger; P. Krzystek; U. Stilla

2008-03-01T23:59:59.000Z

487

DOE/SC-ARM/TR-098 Micropulse Lidar Cloud Mask Value-Added Product...  

NLE Websites -- All DOE Office Websites (Extended Search)

8 Micropulse Lidar Cloud Mask Value-Added Product Technical Report C Sivaraman J Comstock July 2011 DISCLAIMER This report was prepared as an account of work sponsored by the U.S....

488

Tracking random finite objects using 3D-LIDAR in marine environments  

E-Print Network (OSTI)

This paper presents a random finite set theoretic formulation for multi-object tracking as perceived by a 3D-LIDAR in a dynamic environment. It is mainly concerned with the joint detection and estimation of the unknown and ...

Lee, Kwang Wee

489

Latent Heat Flux Profiles from Collocated Airborne Water Vapor and Wind Lidars during IHOP_2002  

Science Conference Proceedings (OSTI)

Latent heat flux profiles in the convective boundary layer (CBL) are obtained for the first time with the combination of the Deutsches Zentrum für Luft- und Raumfahrt (DLR) water vapor differential absorption lidar (DIAL) and the NOAA high ...

C. Kiemle; G. Ehret; A. Fix; M. Wirth; G. Poberaj; W. A. Brewer; R. M. Hardesty; C. Senff; M. A. LeMone

2007-04-01T23:59:59.000Z

490

A Simple Model for Correcting Sodar and Lidar Errors in Complex Terrain  

Science Conference Proceedings (OSTI)

Ground-based sensing of wind profiles by sodars and lidars is becoming the standard for wind energy and other applications. However, there remain difficulties in complex terrain since the instruments sense wind components in spatially separated ...

Stuart Bradley

2012-12-01T23:59:59.000Z

491

Concept design, analysis, and integration of the new u.p.c. multispectral lidar system.  

E-Print Network (OSTI)

??The increasing need for range-resolved aerosol and water-vapour atmospheric observation networks worldwide has given rise to multi-spectral LIDARs (Light Detection and Ranging, a synonym of… (more)

Kumar, Dhiraj

2012-01-01T23:59:59.000Z

492

Statistical methods for 2D-3D registration of optical and LIDAR images  

E-Print Network (OSTI)

Fusion of 3D laser radar (LIDAR) imagery and aerial optical imagery is an efficient method for constructing 3D virtual reality models. One difficult aspect of creating such models is registering the optical image with the ...

Mastin, Dana Andrew

2009-01-01T23:59:59.000Z

493

Elevated Cloud and Aerosol Layer Retrievals from Micropulse Lidar Signal Profiles  

Science Conference Proceedings (OSTI)

A threshold-based detection algorithm for cloud and aerosol layer heights in elevated micropulse lidar data (0.523 ?m) is described. Thresholds for differentiating cloud and aerosol signals from that of the molecular atmosphere are based on the ...

James R. Campbell; Kenneth Sassen; Ellsworth J. Welton

2008-05-01T23:59:59.000Z

494

Water Vapor Profiling Using a Widely Tunable, Amplified Diode-Laser-Based Differential Absorption Lidar (DIAL)  

Science Conference Proceedings (OSTI)

A differential absorption lidar (DIAL) instrument for automated profiling of water vapor in the lower troposphere has been designed, tested, and is in routine operation at Montana State University. The laser transmitter for the DIAL instrument ...

Amin R. Nehrir; Kevin S. Repasky; John L. Carlsten; Michael D. Obland; Joseph A. Shaw

2009-04-01T23:59:59.000Z

495

Fully automatic calibration of LIDAR and video streams from a vehicle  

E-Print Network (OSTI)

This work describes a fully automatic technique to calibrate a geometric mapping between lidar and video feeds on a mobile ground-based platform. This data association is a crucial first step for any multi-modal scene ...

Bileschi, Stanley M.

496

Evaluation of MM5 Optically Thin Clouds over Europe in Fall Using ICESat Lidar Spaceborne Observations  

Science Conference Proceedings (OSTI)

The description of clouds in mesoscale models has progressed significantly during recent years by improving microphysical schemes with more physical parameterizations deduced from observations. Recently, the first lidar in space, the Ice, Cloud, ...

H. Chepfer; M. Chiriaco; R. Vautard; J. Spinhirne

2007-07-01T23:59:59.000Z

497

Application of Lidar Data to Assist Airmass Discrimination at the Whistler Mountaintop Observatory  

Science Conference Proceedings (OSTI)

A ground-based lidar system that has been deployed in Whistler, British Columbia, Canada, since the spring of 2010 provides a means of evaluating vertical aerosol structure in a mountainous environment. This information is used to help to ...

John P. Gallagher; Ian G. McKendry; Paul W. Cottle; Anne Marie Macdonald; W. Richard Leaitch; Kevin Strawbridge

2012-10-01T23:59:59.000Z

498

A Technique for Eliminating Water Returns from Lidar Beach Elevation Surveys  

Science Conference Proceedings (OSTI)

Airborne light detecting and ranging (lidar) systems can survey hundreds of kilometers of shoreline with high spatial resolution (several elevation estimates per square meter). Sequential surveys yield spatial change maps of beach and dune sand ...

Marissa L. Yates; R. T. Guza; Roberto Gutierrez; Richard Seymour

2008-09-01T23:59:59.000Z

499

An Objective Method for Deriving Atmospheric Structure from Airborne Lidar Observations  

Science Conference Proceedings (OSTI)

Wavelet analysis is applied to airborne infrared lidar data to obtain an objective determination of boundaries in aerosol backscatter that are associated with boundary layer structure. This technique allows high-resolution spatial variability of ...

K. J. Davis; N. Gamage; C. R. Hagelberg; C. Kiemle; D. H. Lenschow; P. P. Sullivan

2000-11-01T23:59:59.000Z

500

Tropical Tropopause Transition Layer Cirrus as Represented by CALIPSO Lidar Observations  

Science Conference Proceedings (OSTI)

The spatial and temporal variability of cirrus cloud fraction within the tropical tropopause transition layer (TTL) is investigated based on three years of data from the Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) ...

Katrina S. Virts; John M. Wallace; Qiang Fu; Thomas P. Ackerman

2010-10-01T23:59:59.000Z