Powered by Deep Web Technologies
Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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.


1

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

2

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

3

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

4

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

5

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...

6

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

7

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,...

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

16

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

17

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

18

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

19

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

20

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

22

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

23

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

24

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

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

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

27

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

28

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

29

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

30

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

31

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

32

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

33

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

34

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

35

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

36

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

37

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

38

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

39

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

40

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

42

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

43

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

44

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

45

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

46

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

47

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

48

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

49

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

50

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

51

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

52

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

53

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

54

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

55

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

56

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

57

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

58

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

59

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

60

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

62

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

63

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

64

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

65

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

66

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...

67

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

68

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

69

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

70

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

71

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

72

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

73

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

74

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

75

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

76

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...

77

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

78

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

79

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

80

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

82

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

83

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

84

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

85

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

86

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...

87

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...

88

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...

89

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

90

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

91

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

92

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

93

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

94

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

95

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

96

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

97

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

98

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

99

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

100

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

102

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

103

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

104

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....

105

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

106

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

107

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

108

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

109

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

110

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

111

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

112

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

113

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

114

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

115

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

116

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

117

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

118

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

119

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

120

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

122

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

123

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

124

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

125

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

126

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

127

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

128

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

129

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

130

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

131

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

132

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...

133

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

134

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

135

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

136

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. ...

137

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

138

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

139

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...

140

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...

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

142

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

143

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

144

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

145

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

146

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

147

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

148

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

149

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

150

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

151

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

152

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

153

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

154

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

155

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

156

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

157

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

158

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

159

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

160

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 profiles-temperature" 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.


161

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

162

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

163

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

164

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 :...

165

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

166

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

167

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

168

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

169

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

170

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...

171

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

172

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

173

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

174

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

175

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

176

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

177

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

178

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

179

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

180

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

182

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

183

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

184

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

185

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

186

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

187

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 ...

188

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

189

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

190

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

191

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

192

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

193

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

194

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

195

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

196

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

197

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...

198

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

199

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

200

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

202

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

203

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

204

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

205

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

206

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

207

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

208

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

209

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

210

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

211

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

212

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

213

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

214

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

215

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.)

216

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

217

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

218

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

219

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

220

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

222

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

223

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

224

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

225

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

226

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

227

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

228

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

229

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

230

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

231

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

232

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

233

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

234

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...

235

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

236

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...

237

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

238

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

239

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

240

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

242

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

243

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

244

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

245

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

246

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

247

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

248

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

249

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

250

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

251

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

252

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

253

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

254

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

255

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

256

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

257

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

258

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

259

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

260

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

262

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

263

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

264

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

265

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

266

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

267

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

268

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

269

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

270

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

271

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

272

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

273

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

274

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

275

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

276

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

277

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

278

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

279

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

280

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 profiles-temperature" 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

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

282

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

283

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

284

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

285

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

286

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

287

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

288

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

289

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

290

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

291

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

292

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

293

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

294

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

295

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

296

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

297

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

298

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

299

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

300

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

302

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

303

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

304

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

305

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

306

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

307

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

308

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

309

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

310

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

311

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

312

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

313

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

314

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

315

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

316

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

317

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

318

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

319

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

320

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

322

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

323

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

324

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

325

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

326

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

327

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....

328

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

329

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

330

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

331

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

332

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

333

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

334

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

335

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

336

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.

337

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

338

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

339

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

340

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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

342

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

343

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

344

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

345

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

346

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

347

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

348

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

349

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

350

Combination ring cavity and backward Raman waveguide amplifier  

DOE Patents (OSTI)

A combination regenerative ring and backward Raman waveguide amplifier and a combination regenerative ring oscillator and backward Raman waveguide amplifier which produce Raman amplification, pulse compression, and efficient energy extraction from the CO/sub 2/ laser pump signal for conversion into a Stokes radiation signal. The ring cavity configuration allows the CO/sub 2/ laser pump signal and Stokes signal to copropagate through the Raman waveguide amplifier. The backward Raman waveguide amplifier configuration extracts a major portion of the remaining energy from the CO/sub 2/ laser pump signal for conversion to Stokes radiation.

Kurnit, N.A.

1981-03-13T23:59:59.000Z

351

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

352

Retrieval of Urban Boundary Layer Structures from Doppler Lidar Data. Part I: Accuracy Assessment  

Science Conference Proceedings (OSTI)

Two coherent Doppler lidars from the US 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. The dual lidar data are used to evaluate the accuracy of the four-dimensional variational data assimilation (4DVAR) method and identify the coherent flow structures in the urban boundary layer. The objectives of the study are three-fold. The first objective is to examine the effect of eddy viscosity models on the quality of retrieved velocity data. The second objective is to determine the fidelity of single-lidar 4DVAR and evaluate the difference between single- and dual-lidar retrievals. The third objective is to correlate the retrieved flow structures with the ground building data. It is found that the approach of treating eddy viscosity as part of control variables yields better results than the approach of prescribing viscosity. The ARL single-lidar 4DVAR is able to retrieve radial velocity fields with an accuracy of 98% in the along-beam direction and 80-90% in the cross-beam direction. For the dual-lidar 4DVAR, the accuracy of retrieved radial velocity in the ARL cross-beam direction improves to 90-94%. By using the dual-lidar retrieved data as a reference, the single-lidar 4DVAR is able to recover fluctuating velocity fields with 70-80% accuracy in the along-beam direction and 60-70% accuracy in the cross-beam direction. Large-scale convective roll structures are found in the vicinity of downtown airpark and parks. Vortical structures are identified near the business district. Strong updrafts and downdrafts are also found above a cluster of restaurants.

Xia, Quanxin; Lin, Ching Long; Calhoun, Ron; Newsom, Rob K.

2008-01-01T23:59:59.000Z

353

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

354

A solution of LIDAR problem in double scattering approximation  

E-Print Network (OSTI)

A problem of monoenergetic particles pulse reflection from half-infinite stratified medium is considered in conditions of elastic scattering with absorbtion account. The theory is based on multiple scattering series solution of Kolmogorov equation for one-particle distribution function. The analytical representation for first two terms are given in compact form for a point impulse source and cylindric symmetrical detector. Reading recent articles on the LIDAR sounding of environment (e.g. Atmospheric and Oceanic Optics (2010) 23: 389-395, Kaul, B. V.; Samokhvalov, I. V. http://www.springerlink.com/content/k3p2p3582674xt21/) one recovers standing interest to the related direct and inverse problems. A development of the result fo the case of n-fold scattering and polarization account as well as correspondent convergence series problem solution of the Kolmogorov equation will be published in nearest future.

Sergey Leble; Alexei Buzdin

2011-12-14T23:59:59.000Z

355

Lidar-based Hazard Avoidance for Safe Landing on Mars  

E-Print Network (OSTI)

Hazard avoidance is a key technology for landing large payloads safely on the surface of Mars. During hazard avoidance a lander uses onboard sensors to detect hazards in the landing zone, autonomously selects a safe landing site, and then maneuvers to the new site. Design of a system for hazard avoidance is facilitated by simulation where trades involving sensor and mission requirements can be explored. This paper describes the algorithms and models that comprise a scanning lidarbased hazard avoidance simulation including a terrain generator, a lidar model, hazard avoidance algorithms and powered landing guidance algorithms. Preliminary simulation results show that the proposed hazard avoidance algorithms are effective at detecting hazards and guiding the lander to a safe landing site. 1

Andrew Johnson; James Collier; Aron Wolf

2001-01-01T23:59:59.000Z

356

Combination ring cavity and backward Raman waveguide amplifier  

DOE Patents (OSTI)

A combination regenerative ring and backward Raman waveguide amplifier and a combination regenerative ring oscillator and backward Raman waveguide amplifier which produce Raman amplification, pulse compression, and efficient energy extraction from the CO.sub.2 laser pump signal for conversion into a Stokes radiation signal. The ring cavity configuration allows the CO.sub.2 laser pump signal and Stokes signal to copropagate through the Raman waveguide amplifier. The backward Raman waveguide amplifier configuration extracts a major portion of the remaining energy from the CO.sub.2 laser pump signal for conversion to Stokes radiation. Additionally, the backward Raman amplifier configuration produces a Stokes radiation signal which has a high intensity and a short duration. Adjustment of the position of overlap of the Stokes signal and the CO.sub.2 laser pump signal in the backward Raman waveguide amplifiers alters the amount of pulse compression which can be achieved.

Kurnit, Norman A. (Santa Fe, NM)

1983-01-01T23:59:59.000Z

357

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

358

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

359

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...

360

ARM - Data Announcements Article  

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

Reprocessed Raman Lidar Data Now Available Bookmark and Share This comparison plot shows the improved detection of cirrus and anvil clouds using the Raman and micropluse lidar...

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

Using LiDAR and normalized difference vegetation index to remotely determine LAI and percent canopy cover at varying scales.  

E-Print Network (OSTI)

??The use of airborne LiDAR (Light Detection and Ranging) as a direct method to evaluate forest canopy parameters is vital in addressing both forest management… (more)

Griffin, Alicia Marie Rutledge

2009-01-01T23:59:59.000Z

362

Quantitative Comparison of Lidar Data and User-generated Three-dimensional Building Models From Google Building Maker.  

E-Print Network (OSTI)

??Volunteered geographic information (VGI) has received increased attention as a new paradigm for geographic information production, while light detection and ranging (LiDAR) data is widely… (more)

Liu, Yang

2012-01-01T23:59:59.000Z

363

Raman-based system for DNA sequencing-mapping and other separations  

DOE Patents (OSTI)

DNA sequencing and mapping are performed by using a Raman spectrometer with a surface enhanced Raman scattering (SERS) substrate to enhance the Raman signal. A SERS label is attached to a DNA fragment and then analyzed with the Raman spectrometer to identify the DNA fragment according to characteristics of the Raman spectrum generated.

Vo-Dinh, Tuan (Knoxville, TN)

1994-01-01T23:59:59.000Z

364

Raman-based system for DNA sequencing-mapping and other separations  

DOE Patents (OSTI)

DNA sequencing and mapping are performed by using a Raman spectrometer with a surface enhanced Raman scattering (SERS) substrate to enhance the Raman signal. A SERS label is attached to a DNA fragment and then analyzed with the Raman spectrometer to identify the DNA fragment according to characteristics of the Raman spectrum generated. 11 figures.

Vo-Dinh, T.

1994-04-26T23:59:59.000Z

365

Using light detection and ranging (LiDAR) technology to assess bird-habitat relationships| A case study from the Northwoods of Maine.  

E-Print Network (OSTI)

?? Airborne light detection and ranging (LiDAR) is a remote sensing technology that quantifies the travel time of photons emitted in pulses from a LiDAR… (more)

Newton, Wesley Eugene

2012-01-01T23:59:59.000Z

366

Mapping surface fuels using LIDAR and multispectral data fusion for fire behavior modeling  

E-Print Network (OSTI)

Fires have become intense and more frequent in the United States. Improving the accuracy of mapping fuel models is essential for fuel management decisions and explicit fire behavior prediction for real-time support of suppression tactics and logistics decisions. This study has two main objectives. The first objective is to develop the use of LIght Detection and Ranging (LIDAR) remote sensing to assess fuel models in East Texas accurately and effectively. More specific goals include: (1) developing LIDAR derived products and the methodology to use them for assessing fuel models; (2) investigating the use of several techniques for data fusion of LIDAR and multispectral imagery for assessing fuel models; (3) investigating the gain in fuels mapping accuracy with LIDAR as opposed to QuickBird imagery alone; and, (4) producing spatially explicit digital fuel maps. The second objective is to model fire behavior using FARSITE (Fire Area Simulator) and to investigate differences in modeling outputs using fuel model maps, which differ in accuracy, in east Texas. Estimates of fuel models were compared with in situ data collected over 62 plots. Supervised image classification methods provided better accuracy (90.10%) with the fusion of airborne LIDAR data and QuickBird data than with QuickBird imagery alone (76.52%). These two fuel model maps obtained from the first objective were used to see the differences in fire growth with fuel model maps of different accuracies. According to our results, LIDAR derived data provides accurate estimates of surface fuel parameters efficiently and accurately over extensive areas of forests. This study demonstrates the importance of using accurate maps of fuel models derived using new LIDAR remote sensing techniques.

Mutlu, Muge

2006-12-01T23:59:59.000Z

367

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

368

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

369

Coherent Anti-Stokes Raman Spectroscopy (CARS) - Available ...  

Search PNNL. PNNL Home; About; Research; Publications; Jobs; News; Contacts; Coherent Anti-Stokes Raman Spectroscopy (CARS) Battelle Number(s): 11982. ...

370

Sequencing single molecules using surface-enhanced Raman ...  

Energy Analysis; Energy Storage; Geothermal; Hydrogen and Fuel Cell; Hydropower, Wave and Tidal; ... Events; Sequencing single molecules using surface-enhanced Raman ...

371

Extraction of non-forest trees for biomass assessment based on airborne and terrestrial LiDAR data  

Science Conference Proceedings (OSTI)

The main goal of the federal funded project 'LiDAR based biomass assessment' is the nationwide investigation of the biomass potential coming from wood cuttings of non-forest trees. In this context, first and last pulse airborne laserscanning (F+L) data ... Keywords: LiDAR, correlation, point cloud, segmentation, three-dimensional, vegetation

Matthias Rentsch; Alfons Krismann; Peter Krzystek

2011-10-01T23:59:59.000Z

372

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

373

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

374

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

375

LiDAR At Twenty-Nine Palms Area (Sabin, Et Al., 2010) | Open Energy  

Open Energy Info (EERE)

Nine Palms Area (Sabin, Et Al., 2010) Nine Palms Area (Sabin, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: LiDAR At Twenty-Nine Palms Geothermal Area (Sabin, Et Al., 2010) Exploration Activity Details Location Twenty-Nine Palms Geothermal Area Exploration Technique LiDAR Activity Date Usefulness useful DOE-funding Unknown Notes As previously mentioned, a deep slim hole is scheduled to be drilled in the Camp Wilson area of MCAGCC in June, 2010. The location of this hole is entirely driven by favorable structures as interpreted from LiDAR data and results of the Seabee TGH drilling program completed in early 2009. Details of the MCAGCC work are available in another section of this volume. References Andrew Sabin, S. Bjornstad, M. Lazaro, D. Meade, C. Page, S. Alm, A.

376

Structural Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle  

Open Energy Info (EERE)

Structural Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle Structural 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 OpenEI Reference LibraryAdd to library Journal Article: Structural Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle Aerial Photography, NAS Fallon Geothermal Exploration Project, Dixie Valley, Nevada Abstract The goal of this study is to map and characterize Quaternary faults in southern Dixie Valley for the Department of the Navy Geothermal Program Office's NAS Fallon Geothermal Exploration Project. We will use this information to better characterize the regional structure and geothermal resource potential of the area,with a focus on determining the structural

377

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

378

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

379

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

380

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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.


381

Chemical profiling of the plant cell wall through Raman microspectroscopy  

Science Conference Proceedings (OSTI)

This paper presents a computational framework for chemical profiling of the plant cell wall through the Raman spectroscopy. The system enables query of known spectral signatures and clustering of spectral data based on intrinsic properties. As a result, ... Keywords: multispectral analysis, raman spectroscopy, spatial clustering

Ju Han; Seema Singh; Lan Sun; Blake Simmons; Manfred Auer; Bahram Parvin

2010-04-01T23:59:59.000Z

382

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

383

Wind-Flow Patterns in the Grand Canyon as Revealed by Doppler Lidar  

Science Conference Proceedings (OSTI)

Many interesting flow patterns were found in the Grand Canyon by a scanning Doppler lidar deployed to the south rim during the 1990 Wintertime Visibility Study. Three are analyzed in this study: 1) flow reversal in the canyon, where the flow in ...

Robert M. Banta; Lisa S. Darby; Pirmin Kaufmann; David H. Levinson; Cui-Juan Zhu

1999-08-01T23:59:59.000Z

384

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

385

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

386

Remote sensing the wind using Lidars and Sodars Ioannis Antoniou (1)  

E-Print Network (OSTI)

Remote sensing the wind using Lidars and Sodars Ioannis Antoniou (1) , Mike Courtney(1) , Hans E in increased hub heights and increased rotor diameters, thus making remote sensing an important issue for wind energy applications. Remote sensing techniques offer the ability to determine wind speed and direction

387

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

388

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

389

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

390

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

391

Scientific Investigations Planned for the Lidar In-Space Technology Experiment (LITE)  

Science Conference Proceedings (OSTI)

The Lidar In-Space Technology Experiment (LITE) is being developed by NASA/Langley Research Center for a series of flights on the space shuttle beginning in 1994. Employing a three-wave-length Nd:YAG laser and a 1-m-diameter telescope, the system ...

M. P. McCormick; D. M. Winker; E. V. Browell; J. A. Coakley; C. S. Gardner; R. M. Hoff; G. S. Kent; S. H. Melfi; R. T. Menzies; C. M. R. Platt; D. A. Randall; J. A. Reagan

1993-02-01T23:59:59.000Z

392

Intercomparison of Nocturnal Lower-Atmospheric Structure Observed with Lidar and Sodar Techniques at Pune, India  

Science Conference Proceedings (OSTI)

Coordinated experiments to study the nocturnal lower atmosphere were conducted on selected nights during April?August 1991 using an argon ion lidar and a Doppler sodar at the Indian Institute of Tropical Meteorology, Pune (18°32?N, 73°51?E, 559 m ...

P. C. S. Devara; P. Ernest Raj; B. S. Murthy; G. Pandithurai; S. Sharma; K. G. Vernekar

1995-06-01T23:59:59.000Z

393

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

394

Evolution of the Monterey Bay Sea-Breeze Layer As Observed by Pulsed Doppler Lidar  

Science Conference Proceedings (OSTI)

As part of the Land/Sea Breeze Experiment (LASBEX) to study the sea breeze at Monterey Bay, the pulsed Doppler lidar of the NOAA/ERL Wave Propagation Laboratory performed vertical and nearly horizontal scans of the developing sea breeze on 12 ...

Robert M. Banta; Lisa D. Olivier; David H. Levinson

1993-12-01T23:59:59.000Z

395

Smoke-Column Observations from Two Forest Fires Using Doppler Lidar and Doppler Radar  

Science Conference Proceedings (OSTI)

To demonstrate the usefulness of active remote-sensing systems in observing forest fire plume behavior, we studied two fires, one using a 3.2-cm-wavelength Doppler radar, and one more extensively, using Doppler lidar. Both instruments observed ...

R. M. Banta; L. D. Olivier; E. T. Holloway; R. A. Kropfli; B. W. Bartram; R. E. Cupp; M. J. Post

1992-11-01T23:59:59.000Z

396

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

397

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

398

Versatile Lidar for Atmospheric Studies, Including Plume Dispersion, Clouds, and Stratospheric Aerosol  

Science Conference Proceedings (OSTI)

A transportable scanning lidar for studying clouds, plume dispersion, and stratospheric aerosal at any of three wavelengths is described. A ruby laser transmits linearly polarized light of 694.3 nm wavelength at a maximum 0.8 s?1 pulse rate. The ...

W. L. Eberhard; G. T. Mcnice

1986-12-01T23:59:59.000Z

399

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

400

Experimental Validation of Wind Profiling Performed by the Airborne 10-?m Heterodyne Doppler Lidar WIND  

Science Conference Proceedings (OSTI)

The airborne Wind Infrared Doppler Lidar (WIND) has been developed through French–German cooperation. The system is based on a pulsed 10.6-?m laser transmitter, a heterodyne receiver, and a conical scanning device. To the authors' knowledge, it ...

Oliver Reitebuch; Christian Werner; Ines Leike; Patricia Delville; Pierre H. Flamant; Alexander Cress; Dirk Engelbart

2001-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

A Four-Year Lidar–Sun Photometer Aerosol Study at São Paulo, Brazil  

Science Conference Proceedings (OSTI)

A backscattering lidar system, the first of this kind in Brazil, has been used to provide the vertical profile of the aerosol backscatter coefficient at 532 nm up to an altitude of 4–6 km above sea level (ASL), in a suburban area in the city of ...

Eduardo Landulfo; Alexandros Papayannis; Ani Sobral Torres; Sandro Toshio Uehara; Lucila Maria Viola Pozzetti; Caio Alencar de Matos; Patricia Sawamura; Walter Morinobu Nakaema; Wellington de Jesus

2008-08-01T23:59:59.000Z

402

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

403

Scanning Eye-Safe Elastic Backscatter Lidar at 1.54 ?m  

Science Conference Proceedings (OSTI)

A field-deployable scanning direct-detection elastic backscatter lidar system that is eye safe at all ranges is presented. The first two-dimensional spatial images created by scanning this new 1.54-?m wavelength system, and time-lapse animations (...

Scott M. Spuler; Shane D. Mayor

2005-06-01T23:59:59.000Z

404

Biomass and Bioenergy 31 (2007) 646655 Estimating biomass of individual pine trees using airborne lidar  

E-Print Network (OSTI)

Biomass and Bioenergy 31 (2007) 646­655 Estimating biomass of individual pine trees using airborne biomass and bio-energy feedstocks. The overall goal of this study was to develop a method for assessing aboveground biomass and component biomass for individual trees using airborne lidar data in forest settings

405

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

406

Lidar Observations of Gravity Waves and Their Spectra near the Mesopause and Stratopause at Arecibo  

Science Conference Proceedings (OSTI)

The UIUC CEDAR Rayleigh/Na lidar was operated for approximately 160 h on 30 nights in January, March, and April 1989 at the Arecibo Observatory (18°N, 67°W) as part of the AIDA Act '89 Campaign. During this period 38 quasi-monochromatic gravity ...

Timothy J. Beatty; Chris A. Hostetler; Chester S. Gardner

1992-03-01T23:59:59.000Z

407

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

408

Improved Approach to Lidar Airport Obstruction Surveying Using Full-Waveform Data  

E-Print Network (OSTI)

Over the past decade, the National Oceanic and Atmospheric Administration’s National Geodetic Survey, in collaboration with multiple organizations, has conducted research into airport obstruction surveying using airborne lidar. What was initially envisioned as a relatively straightforward demonstration of the utility of this emerging remote sensing technology for airport surveys was quickly shown to be a challenging undertaking fraught with both technical and practical issues. We provide a brief history of previous work in lidar airport obstruction surveying, including a discussion of both past achievements and previously-unsolved problems. We then present a new processing workflow, specifically designed to overcome the remaining problems. A key facet of our approach is the use of a new lidar waveform deconvolution and georeferencing strategy that produces very dense, detailed point clouds in which the vertical structures of objects are well characterized. Additional processing steps have been carefully selected and ordered based on the objectives of meeting Federal Aviation Administration requirements and maximizing efficiency. Tests conducted using lidar waveform data for two project sites demonstrate the efficacy of the approach. 1

Christopher E. Parrish; Robert D. Nowak

2009-01-01T23:59:59.000Z

409

Automated extraction of street-scene objects from mobile lidar point clouds  

Science Conference Proceedings (OSTI)

Mobile laser scanning or lidar is a new and rapid system to capture high-density three-dimensional 3-D point clouds. Automatic data segmentation and feature extraction are the key steps for accurate identification and 3-D reconstruction of street-scene ...

Bisheng Yang; Zheng Wei; Qingquan Li; Jonathan Li

2012-09-01T23:59:59.000Z

410

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

411

Fusing LIDAR, camera and semantic information: A context-based approach for pedestrian detection  

Science Conference Proceedings (OSTI)

In this work, a context-based multisensor system, applied to pedestrian detection in urban environments, is presented. The proposed system comprises three main processing modules: (i) a LIDAR-based module acting as the primary object detector, (ii) a ... Keywords: Sensor fusion, computer vision, field and service robotics, field robots, range sensing, recognition, sensing and perception

Cristiano Premebida, Urbano Nunes

2013-03-01T23:59:59.000Z

412

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

413

Conditional random fields for urban scene classification with full waveform LiDAR data  

Science Conference Proceedings (OSTI)

We propose a context-based classification method for point clouds acquired by full waveform airborne laser scanners. As these devices provide a higher point density and additional information like echo width or type of return, an accurate distinction ... Keywords: 3D point cloud, classification, conditional random fields, full waveform LiDAR, urban

Joachim Niemeyer; Jan Dirk Wegner; Clément Mallet; Franz Rottensteiner; Uwe Soergel

2011-10-01T23:59:59.000Z

414

Building detection in an urban area using lidar data and QuickBird imagery  

Science Conference Proceedings (OSTI)

This article presents a hierarchical approach to detect buildings in an urban area through the combined usage of lidar data and QuickBird imagery. A normalized digital surface model nDSM was first generated on the basis of the difference between a digital ...

Lei Chen; Shuhe Zhao; Wenquan Han; Yun Li

2012-08-01T23:59:59.000Z

415

Automatic environmental quality assessment for mixed-land zones using lidar and intelligent techniques  

Science Conference Proceedings (OSTI)

Human impact on the natural environment is an evident global fact. Natural, industrial and touristic areas coexist in a more than delicate balance. In Andalusia, in the south of Spain, the Regional Ministry for the Environment is responsible for the ... Keywords: Classification, Decision trees, Intelligent techniques, LULC, Land cover, Land uses, Lidar

Jorge Garcia-Gutierrez; Luis Gonçalves-Seco; Jose C. Riquelme-Santos

2011-06-01T23:59:59.000Z

416

Scanning Doppler Lidar for Input into Short-Term Wind Power Forecasts  

Science Conference Proceedings (OSTI)

Scanning Doppler lidar is a promising technology for improvements in short-term wind power forecasts since it can scan close to the surface and produce wind profiles at a large distance upstream (15–30 km) if the atmosphere has sufficient aerosol ...

Rod Frehlich

2013-02-01T23:59:59.000Z

417

Tracking random finite objects using 3D-LIDAR in marine environments  

Science Conference Proceedings (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 time varying number of objects ... Keywords: PHD filter, RFS, tracking, velodyne

Kwang Wee Lee; Bharath Kalyan; Sardha Wijesoma; Martin Adams; Franz S. Hover; Nicholas M. Patrikalakis

2010-03-01T23:59:59.000Z

418

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

419

An improved topographic mapping technique from airborne lidar: application in a forested hillside  

Science Conference Proceedings (OSTI)

We developed a robust method to reconstruct a digital terrain model DTM by classifying raw light detection and ranging lidar points into ground and non-ground points with the help of the Progressive Terrain Fragmentation PTF method. PTF applies iterative ...

Jun-Hak Lee, GregoryS. Biging, JohnD. Radke, JoshuaB. Fisher

2013-10-01T23:59:59.000Z

420

Area-Based Mapping of Defoliation of Scots Pine Stands Using Airborne Scanning LiDAR  

E-Print Network (OSTI)

Abstract: The mapping of changes in the distribution of insect-caused forest damage remains an important forest monitoring application and challenge. Efficient and accurate methods are required for mapping and monitoring changes in insect defoliation to inform forest management and reporting activities. In this research, we develop and evaluate a LiDAR-driven (Light Detection And Ranging) approach for mapping defoliation caused by the Common pine sawfly (Diprion pini L.). Our method requires plot-level training data and airborne scanning LiDAR data. The approach is predicated on a forest canopy mask created by detecting forest canopy cover using LiDAR. The LiDAR returns that are reflected from the canopy (that is, returns> half of maximum plot tree height) are used in the prediction of the defoliation. Predictions of defoliation are made at plot-level, which enables a direct integration of the method to operational forest management planning while also providing additional value-added from inventory-focused LiDAR datasets. In additionRemote Sens. 2013, 5 1221

Mikko Vastaranta; Tuula Kantola; Päivi Lyytikäinen-saarenmaa; Markus Holopainen; Ville Kankare; Michael A. Wulder

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

Lidars in Wind Energy Jakob Mann, Ferhat Bingl, Torben Mikkelsen, Ioannis Antoniou, Mike  

E-Print Network (OSTI)

Lidars in Wind Energy Jakob Mann, Ferhat Bingöl, Torben Mikkelsen, Ioannis Antoniou, Mike Courtney, Gunner Larsen, Ebba Dellwik Juan Jose Trujillo* and Hans E. Jørgensen Wind Energy Department Risø of the presentation · Introduction to wind energy · Accurate profiles of the mean wind speed · Wakes behind turbines

422

Resonance Raman Study of I2 -Intercalated Single-Walled Carbon Nanotubes  

Science Conference Proceedings (OSTI)

We conducted resonance Raman studies on the iodine-intercalated bundles of single-walled carbon nanotubes (SWNTs). The Raman spectra obtained using the 647.1-nm line of a Kr-ion laser indicate that I2 intercalation affects the electronic ... Keywords: I $_2$-intercalation, Raman spectroscopy, resonance Raman, single-walled carbon nanotubes

V. M. Nguyen; I. S. Yang; Y. Jung; S. -J. Kim; J. Oh; W. Yi

2007-01-01T23:59:59.000Z

423

Detailed Hydrographic Feature Extraction from High-Resolution LiDAR Data  

SciTech Connect

Detailed hydrographic feature extraction from high-resolution light detection and ranging (LiDAR) data is investigated. Methods for quantitatively evaluating and comparing such extractions are presented, including the use of sinuosity and longitudinal root-mean-square-error (LRMSE). These metrics are then used to quantitatively compare stream networks in two studies. The first study examines the effect of raster cell size on watershed boundaries and stream networks delineated from LiDAR-derived digital elevation models (DEMs). The study confirmed that, with the greatly increased resolution of LiDAR data, smaller cell sizes generally yielded better stream network delineations, based on sinuosity and LRMSE. The second study demonstrates a new method of delineating a stream directly from LiDAR point clouds, without the intermediate step of deriving a DEM. Direct use of LiDAR point clouds could improve efficiency and accuracy of hydrographic feature extractions. The direct delineation method developed herein and termed “mDn”, is an extension of the D8 method that has been used for several decades with gridded raster data. The method divides the region around a starting point into sectors, using the LiDAR data points within each sector to determine an average slope, and selecting the sector with the greatest downward slope to determine the direction of flow. An mDn delineation was compared with a traditional grid-based delineation, using TauDEM, and other readily available, common stream data sets. Although, the TauDEM delineation yielded a sinuosity that more closely matches the reference, the mDn delineation yielded a sinuosity that was higher than either the TauDEM method or the existing published stream delineations. Furthermore, stream delineation using the mDn method yielded the smallest LRMSE.

Danny L. Anderson

2012-05-01T23:59:59.000Z

424

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

425

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

426

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

427

Lagrangian Coherent Structure Analysis of Terminal Winds Detected by Lidar. Part II: Structure Evolution and Comparison with Flight Data  

Science Conference Proceedings (OSTI)

Using observational data from coherent Doppler light detection and ranging (lidar) systems situated at the Hong Kong International Airport (HKIA), the authors extract Lagrangian coherent structures (LCS) intersecting the flight path of landing ...

Wenbo Tang; Pak Wai Chan; George Haller

2011-10-01T23:59:59.000Z

428

High-Resolution Properties of the Equatorial Pacific Marine Atmospheric Boundary Layer from Lidar and Radiosonde Observations  

Science Conference Proceedings (OSTI)

A “thermostat” mechanism for cooling the Equatorial pacific is being tested with data collected during the Central Equatorial Pacific Experiment. The Los Alamos National Laboratory participated by fielding two shipboard lidars that collected ...

D. I. Cooper; W. E. Eichinger; S. Barr; W. Cottingame; M. V. Hynes; C. F. Keller; C. F. Lebeda; D. A. Poling

1996-07-01T23:59:59.000Z

429

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

430

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

431

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

432

Inference of Marine Atmospheric Boundary Layer Moisture and Temperature Structure Using Airborne Lidar and Infrared Radiometer Data  

Science Conference Proceedings (OSTI)

A new technique for retrieving near-surface moisture and profiles of mixing ratio and potential temperature through the depth of the marine atmospheric boundary layer (MABL) using airborne lidar and multichannel infrared radiometer data is ...

Stephen P. Palm; Denise Hagan; Geary Schwemmer; S. H. Melfi

1998-03-01T23:59:59.000Z

433

Eye-Safe Diode-Laser-Based Micropulse Differential Absorption Lidar (DIAL) for Water Vapor Profiling in the Lower Troposphere  

Science Conference Proceedings (OSTI)

A second-generation diode-laser-based master oscillator power amplifier (MOPA) configured micropulse differential absorption lidar (DIAL) instrument for profiling of lower-tropospheric water vapor is presented. The DIAL transmitter is based on a ...

Amin R. Nehrir; Kevin S. Repasky; John L. Carlsten

2011-02-01T23:59:59.000Z

434

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

435

Method to determine and adjust the alignment of the transmitter and receiver fields of view of a LIDAR system  

SciTech Connect

A method to determine the alignment of the transmitter and receiver fields of view of a light detection and ranging (LIDAR) system. This method can be employed to determine the far-field intensity distribution of the transmitter beam, as well as the variations in transmitted laser beam pointing as a function of time, temperature, or other environmental variables that may affect the co-alignment of the LIDAR system components. In order to achieve proper alignment of the transmitter and receiver optical systems when a LIDAR system is being used in the field, this method employs a laser-beam-position-sensing detector as an integral part of the receiver optics of the LIDAR system.

Schmitt, Randal L. (Tijeras, NM); Henson, Tammy D. (Albuquerque, NM); Krumel, Leslie J. (Cedar Crest, NM); Hargis, Jr., Philip J. (Albuquerque, NM)

2006-06-20T23:59:59.000Z

436

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

437

A framework for non-ICP lidar-based pose estimation using an optimally constrained 3D target.  

E-Print Network (OSTI)

??This thesis describes a non-ICP-based framework fohr [sic] the computation of a pose estimate of a special target shape from raw LIDAR scan data. In… (more)

Saint-Cyr, Pierre

2010-01-01T23:59:59.000Z

438

Three-dimensional Simulation of Backward Raman Amplification  

SciTech Connect

Three-dimensional (3-D) simulations for the Backward Raman Amplification (BRA) are presented. The images illustrate the effects of pump depletion, pulse diffraction, non-homogeneous plasma density, and plasma ionization.

A.A. Balakin; G.M. Fraiman; N.J. Fisch

2005-11-12T23:59:59.000Z

439

Evaluations of single walled carbon nanotubes using resonance Raman spectroscopy  

E-Print Network (OSTI)

This work reports the results of two studies which use resonance Raman scattering to evaluate the vibrational properties of single walled carbon nanotubes (SWNTs). In the first study, we report an evaluation of second-order ...

Brar, Victor W. (Victor Watson), 1981-

2004-01-01T23:59:59.000Z

440

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

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.

442

The infrared and Raman spectra of ?-TaPO  

Science Conference Proceedings (OSTI)

[1,2]. Also, the vibrational spectra of/~-VPOs and. ~-VSOs which possess ... 1 illustrates the Raman spectra for .... N.G. CHERNORUKOV, N.P. EGOROV, E.V..

443

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

444

Raman Scattering at Plasmonic Junctions Shorted by Conductive Molecular Bridges  

Science Conference Proceedings (OSTI)

Intensity spikes in Raman scattering, accompanied by switching between line spectra and band spectra, can be assigned to shorting the junction plasmon through molecular conductive bridges. This is demonstrated through Raman trajectories recorded at a plasmonic junction formed by a gold AFM tip in contact with a silver surface coated either with biphenyl-4,4’-dithiol or biphenyl-4-thiol. The fluctuations are absent in the monothiol. In effect, the making and breaking of chemical bonds is tracked.

El-Khoury, Patrick Z.; Hu, Dehong; Apkarian, V. Ara; Hess, Wayne P.

2013-04-10T23:59:59.000Z

445

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

446

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

447

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

448

Simultaneous Observations of Thin Humidity Gradients in the Lower Troposphere with a Raman Lidar and the Very High-Frequency Middle- and Upper-Atmosphere Radar  

Science Conference Proceedings (OSTI)

Humidity is, among other things, a key parameter in the evolution of atmospheric dynamics and in the formation of clouds and precipitation through latent heat release. The continuous observation of its vertical distribution is thus important in ...

H. Luce; T. Takai; T. Nakamura; M. Yamamoto; S. Fukao

2010-05-01T23:59:59.000Z

449

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

450

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

451

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

452

A COMPRESSED SENSING METHOD WITH ANALYTICAL RESULTS FOR LIDAR FEATURE CLASSIFICATION  

Science Conference Proceedings (OSTI)

We present an innovative way to autonomously classify LiDAR points into bare earth, building, vegetation, and other categories. One desirable product of LiDAR data is the automatic classification of the points in the scene. Our algorithm automatically classifies scene points using Compressed Sensing Methods via Orthogonal Matching Pursuit algorithms utilizing a generalized K-Means clustering algorithm to extract buildings and foliage from a Digital Surface Models (DSM). This technology reduces manual editing while being cost effective for large scale automated global scene modeling. Quantitative analyses are provided using Receiver Operating Characteristics (ROC) curves to show Probability of Detection and False Alarm of buildings vs. vegetation classification. Histograms are shown with sample size metrics. Our inpainting algorithms then fill the voids where buildings and vegetation were removed, utilizing Computational Fluid Dynamics (CFD) techniques and Partial Differential Equations (PDE) to create an accurate Digital Terrain Model (DTM) [6]. Inpainting preserves building height contour consistency and edge sharpness of identified inpainted regions. Qualitative results illustrate other benefits such as Terrain Inpainting s unique ability to minimize or eliminate undesirable terrain data artifacts. Keywords: Compressed Sensing, Sparsity, Data Dictionary, LiDAR, ROC, K-Means, Clustering, K-SVD, Orthogonal Matching Pursuit

Allen, Josef D [ORNL

2011-01-01T23:59:59.000Z

453

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

454

AUTOMATIC DETECTION OF GRAVEL BARS IN A RIVER CHANNEL FROM AIRBORNE LIDAR-DERIVED DTM  

E-Print Network (OSTI)

Airborne Laser Scanning or LiDAR data are widely used nowadays in river valleys for topography and hydro-morphology. However, the large data sets of unprocessed 3D point clouds require some challenging treatment and end-users may prefer to deal with DTMs (Digital Terrain Models) derived from LiDAR surveys. Without any complementary data (such as field survey or photographs) detecting position and shape of gravel bars in a river is a demanding task, especially if done manually. This paper presents a method for automatic segmentation of a river channel into distinct hydro- morphological entities: water, gravel bars, banks,... This method is based on image processing algorithms (region growing segmentation combined with morphological closing and altitude thresholding) in order to separate water from other elements present in the channel, based on the altitude information. This method is applied to a reach of the Arcen-Maurienne River, France, with alternate gravel bars. The only data source is the 0.25 m resolution DTM, derived from an airborne LiDAR survey. Results show that the developed method succeeds in automatically delimiting the main channel and in detecting gravel bars. It is then possible to get global information on the gravel bars such as location along the river or emerged surface area and topography.

Lionel Pénard; Maxime Morel

2013-01-01T23:59:59.000Z

455

Caracterização do ácido esquárico e materiais derivados por espectrocopia Raman intensificada (uso de substratos metálicos SERS de alto desempenho).  

E-Print Network (OSTI)

??Nesta tese foram utilizadas as espectroscopias de espalhamento Raman intensificado pela superficie(Surface-EnhancedRaman Scattering- SERS) e Raman ressonante para monitorar a adsorção e o comportamento faradáico… (more)

Antonio Carlos Sant\\ Ana

2005-01-01T23:59:59.000Z

456

Raman Spectroscopy and instrumentation for monitoring soil carbon systems.  

SciTech Connect

This work describes developments in the application of Raman scattering and surface-enhanced Raman scattering (SERS) towards the assessment/characterization of carbon in soil. In the past, the nonspecific total carbon mass content of soil samples has generally been determined through mass loss techniques and elemental analysis. However, because of the concern over CO{sub 2} buildup in the atmosphere and its possible role in the ''Greenhouse Effect,'' there is a need for better-defined models of global cycling of carbon. As a means towards this end, there is a need to know more about the structure and functionality of organic materials in soil. Raman spectroscopy may therefore prove to be an exceptional tool in soil carbon analysis. Based on vibrational transitions of irradiated molecules, it provides structural information that is often suitable for sample identification. Furthermore, Raman scattering yields very fine spectral features which offer the potential for multicomponent sample analysis with minimal or no sample pretreatment. Although the intensity of Raman scattering is generally extremely low, the surface-enhanced Raman scattering (SERS) effect can greatly enhance Raman signals (10{sup 6}-10{sup 8} range) through the adsorption of compounds on specially roughened metal surfaces. In our laboratory, we have investigated copper, gold and silver as possible substrate metals in the fabrication of SERS substrates. These substrates have included metal-coated microparticles, metal island films, and redox-roughened metal foils. We have evaluated several laser excitation sources spanning the 515-785 nm range for both Raman and SERS analysis. For this particular study, we have selected fulvic and humic acids as models for establishing the feasibility of using Raman and SERS in soil carbon analysis. Our studies thus far have demonstrated that copper substrates perform best in the SERS detection of humic and fulvic acids, particularly when coupled to electrochemical processes that enhance adsorption of specific compounds. This effect not only yields a stronger signal, but can also impart selectivity in the analysis of complex samples such as soil.

Stokes, D.L.

2003-12-08T23:59:59.000Z

457

Simulation of Laser-Induced Light Emissions from Water and Extraction of Raman Signal  

Science Conference Proceedings (OSTI)

A simulation of the laser-induced Raman and fluorescence spectra produced by laser irradiation of the water column is described as well as a method of extracting the Raman signal from the fluorescence spectra using multiple laser excitation ...

Jeffrey E. James; Chung San Lin; William P. Hooper

1999-03-01T23:59:59.000Z

458

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

459

Raman Studies of Nanocrystalline CdS:O Film  

DOE Green Energy (OSTI)

Oxygenated nanocrystalline CdS films show improved solar cell performance, but the physics and mechanism underlying this are not yet clearly understood. Raman study provides complementary information to the understanding obtained from other experimental investigations. A comprehensive analysis of the existing experimental data (including x-ray diffraction, transmission, transmission electron microscopy, and Raman) has led to the following conclusions: (1) The O-incorporation forms CdS1-xOx alloy nano-particles. (2) The observed evolution of the electronic structure is the result of the interplay between the alloy and quantum confinement effect. (3) The blue-shift of the LO phonon Raman peak is primarily due to the alloying effect. (4) Some oxygen atoms have taken the interstitial sites.

Zhang, Y.; Wu, X.; Dhere, R.; Zhou, J.; Yan, Y.; Mascarenhas, A.

2005-01-01T23:59:59.000Z

460

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

Building boundary extraction from high resolution imagery and lidar data. In: ISPRS08, p. B3b: 693 ff  

E-Print Network (OSTI)

Building boundary data are necessary for the real estate industry, 3D city models and many other applications. In this study, a novel approach integrated high resolution imagery and Lidar data is proposed for automatically obtaining building boundaries with precise geometric position and details. The high resolution images were used to directly extract the building boundaries with precise geometric position, our approach is focused on improving the correctness and completeness of the extracted boundaries by integrating Lidar data. The approach consists of four steps: Lidar data processing, building image generation, line segment extraction, and boundary segment selection. Firstly, the segmented building points need to be determined from raw Lidar data. Then, a building image is generated by processing an original image using a bounding rectangle and a buffer, which are derived from the segmented building points. Based on the building image and rough principal direction constraints, an algorithm is proposed to estimate the principal orientations of a building, which ensures the accuracy and robustness of the subsequent line segments extraction. Finally, an algorithm based on Lidar point density analysis and Kmeans clustering is proposed to identify accurate boundary segments from the extracted line segments dynamically. The experiment results demonstrated that the proposed approach determined building boundaries well. 1.

Liang Cheng; Jianya Gong; Xiaoling Chen; Peng Han

2008-01-01T23:59:59.000Z

462

Ring cavity for a Raman capillary waveguide amplifier  

DOE Patents (OSTI)

Disclosed is a regenerative ring amplifier and regenerative ring oscillator which function to feed back a portion of the Stokes signal to complete the ring cavity. The ring cavity configuration allows the CO[sub 2] laser pump signal and Stokes signal to copropagate through the Raman capillary waveguide amplifier. A Raman capillary waveguide amplifier is also provided in the return leg of the ring cavity to increase gain without increasing the round trip time. Additionally, the ring cavity can be designed such that the amplifier Stokes signal is synchronous with the mode-locked spikes of the incoming CO[sub 2] laser pump signal. 6 figs.

Kurnit, N.A.

1983-07-19T23:59:59.000Z

463

Ring cavity for a Raman capillary waveguide amplifir  

DOE Patents (OSTI)

A regenerative ring amplifier and regenerative ring oscillator are described which function to feed back a portion of the Stokes signal to complete the ring cavity. The ring cavity configuration allows the CO/sub 2/ laser pump signal and Stokes signal to copropagate through the Raman capillary waveguide amplifier. A Raman capillary waveguide amplifier is also provided in the return leg of the ring cavity to increase gain without increasing the round trip time. Additionally, the ring cavity can be designed such that the amplified Stokes signal is synchronous with the mode-locked spikes of the incoming CO/sub 2/ laser pump signal.

Kurnit, N.A.

1981-01-27T23:59:59.000Z

464

Thresholds of Raman backscatter: effects of collisions and Landau damping  

Science Conference Proceedings (OSTI)

We present 1.5 dimensional simulations and theory of the threshold of Raman backscatter for a variety of density profiles, background temperatures and collision frequencies, nu/sub ei/. The simulations show Raman backscatter of approx. 4 x 10/sup -4/ at intensities approx. 30 times below the del n threshold which we suggest is due to light scattering off of noise electron plasma waves. The absorption drops significantly and the threshold rises as the Landau damping ..omega../sub i/ and/or nu/sub ei/ approach the growth rate ..gamma../sub 0/. Many experiments are already in the collisional regime.

Estabrook, K.; Kruer, W.L.

1983-11-03T23:59:59.000Z

465

Ring cavity for a Raman capillary waveguide amplifier  

DOE Patents (OSTI)

A regenerative ring amplifier and regenerative ring oscillator are described which function to feed back a portion of the Stokes signal to complete the ring cavity. The ring cavity configuration allows the CO/sub 2/ laser pump signal and Stokes signal to copropagate through the Raman capillary waveguide amplifier. A Raman capillary waveguide amplifier is also provided in the return leg of the ring cavity to increase gain without increasing the round trip time. Additionally, the ring cavity can be designed such that the amplified Stokes signal is synchronous with the mode-locked spikes of the incoming CO/sub 2/ laser pump signal.

Kurnit, N.A.

1981-01-27T23:59:59.000Z

466

Summary report of FY 1995 Raman spectroscopy technology development  

Science Conference Proceedings (OSTI)

US DOE is sponsoring development of remote, fiber-optic Raman spectroscopy for rapid chemical characterization of Hanford high-level radioactive tank waste. Deployment targets for this technology are analytical hot cells and, via the Light-Duty Utility Arm and cone penetrometer, the waste tanks themselves. Perceived benefits of fiber-optic Raman spectroscopy are (1) rapid generation of tank-waste safety-related data, (2) reduced personnel exposure to highly radioactive waste, (3) reduced tank-waste sampling and analysis costs, and (4) reduced radioactive analytical waste. This document presents the results from the investigation of two dispersive, transmission-grating Raman systems and four fiber-optic Raman probe designs with non-radioactive tank waste simulants. One Raman system used a 532-nm, 400 mW, solid-state laser; the other used a 785-nm, 500 mW, solid-state diode laser. We found (1) the transmission-grating systems had better wavelength stability than previously tried Czerny-Turner-Based systems and (2) the 785-nm system`s specie detection limits in the spectral fingerprint regiion were at least as good as those for the 532-nm system. Based on these results, and the fact that some tank wastes luminesce with 514.5nm excitation, we selected the 785-nm system for hot-cell use. Of the four probes tested, three had a ``six-around-on`` fiber probe design; the fourth probe was a one-fiber-in-one-fiber-out, diffuse-relectance design. Comparison of the four probes` signal-to-noise rations, rations, transmission/collection efficiencies, and probe-silica Raman backgrounds showed that the best probe for use with Hanford-Site tank waste should (1) be filtered as close to the probe tip as possible to reduce the probe-silica Raman background and (2) have multiple collection fibers. The responses of all the probes tested showed a strong dependence on probe-sample distance, and the presence of a probe window appeared to increase the probe`s silica Raman background.

Douglas, J.G.

1995-11-01T23:59:59.000Z

467

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

468

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

469

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

470

Raman study of lead zirconate titanate under uniaxial stress  

SciTech Connect

The authors used micro-Raman spectroscopy to monitor the ferroelectric (FE) to antiferroelectric (AFE) phase transition in PZT ceramic bars during the application of uniaxial stress. They designed and constructed a simple loading device, which can apply sufficient uniaxial force to transform reasonably large ceramic bars while being small enough to fit on the mechanical stage of the microscope used for Raman analysis. Raman spectra of individual grains in ceramic PZT bars were obtained as the stress on the bar was increased in increments. At the same time gauges attached to the PZT bar recorded axial and lateral strains induced by the applied stress. The Raman spectra were used to calculate an FE coordinate, which is related to the fraction of FE phase present. The authors present data showing changes in the FE coordinates of individual PZT grains and correlate these changes to stress-strain data, which plot the macroscopic evolution of the FE-to-AFE transformation. Their data indicates that the FE-to-AFE transformation does not occur simultaneously for all PZT grains but that grains react individually to local conditions.

TALLANT, DAVID R.; SIMPSON, REGINA L.; GRAZIER, J. MARK; ZEUCH, DAVID H.; OLSON, WALTER R.; TUTTLE, BRUCE A.

2000-04-01T23:59:59.000Z

471

Development of Raman Spectroscopy for a Steam Generator Heated Crevice  

Science Conference Proceedings (OSTI)

The crevice formed by the tube / tube support plate (tube/TSP) intersection in a pressurized water reactor (PWR) steam generator (SG) is a concentration site for nonvolatile impurities from steam generator water (referred to as hideout). This report describes development of a Raman spectroscopy device to investigate this chemical concentration process in situ in a simulated heated crevice.

2003-11-11T23:59:59.000Z

472

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

473

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

474

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

475

K.: Automatic alignment of a camera with a line scan lidar system  

E-Print Network (OSTI)

Abstract — We propose a new method for extrinsic calibration of a line-scan LIDAR with a perspective projection camera. Our method is a closed-form, minimal solution to the problem. The solution is a symbolic template found via variable elimination and the multi-polynomial Macaulay resultant. It does not require initialization, and can be used in an automatic calibration setting when paired with RANSAC and least-squares refinement. We show the efficacy of our approach through a set of simulations and a real calibration. I.

Oleg Naroditsky; Er Patterson Iv; Kostas Daniilidis

2011-01-01T23:59:59.000Z

476

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

477

Time-resolved coherent anti-Stokes Raman scattering microscopy: Imaging based on Raman free induction decay  

E-Print Network (OSTI)

. The T-CARS experiment involves three incident electric fields, Em(r,t), with frequencies at m m P1,P2; accepted for publication 10 January 2002 A time-resolved coherent anti-Stokes Raman scattering CARS and the solvent, and thus increasing the detection sensitivity of CARS microscopy significantly. © 2002 American

Xie, Xiaoliang Sunney

478

Lidar Investigation of Tropical Nocturnal Boundary Layer Aerosols and Cloud Macrophysics  

SciTech Connect

Observational evidence of two-way association between nocturnal boundary layer aerosols and cloud macrophysical properties under different meteorological conditions is reported in this paper. The study has been conducted during 2008-09 employing a high space-time resolution polarimetric micro-pulse lidar over a tropical urban station in India. Firstly, the study highlights the crucial role of boundary layer aerosols and background meteorology on the formation and structure of low-level stratiform clouds in the backdrop of different atmospheric stability conditions. Turbulent mixing induced by the wind shear at the station, which is associated with a complex terrain, is found to play a pivotal role in the formation and structural evolution of nocturnal boundary layer clouds. Secondly, it is shown that the trapping of energy in the form of outgoing terrestrial radiation by the overlying low-level clouds can enhance the aerosol mixing height associated with the nocturnal boundary layer. To substantiate this, the long-wave heating associated with cloud capping has been quantitatively estimated in an indirect way by employing an Advanced Research Weather Research and Forecasting (WRF-ARW) model version 2.2 developed by National Center for Atmospheric Research (NCAR), Colorado, USA, and supplementary data sets; and differentiated against other heating mechanisms. The present investigation as well establishes the potential of lidar remote-sensing technique in exploring some of the intriguing aspects of the cloud-environment relationship.

Manoj, M. G.; Devara, PC S.; Taraphdar, Sourav

2013-10-01T23:59:59.000Z

479

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

480

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

Note: This page contains sample records for the topic "raman lidar profiles-temperature" 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

Remote Assessment of Army Tactictal River Crossing Sites Using LIDAR Imagery  

E-Print Network (OSTI)

Approved for public release; distribution is unlimited. Prepared for Tactical river crossings present impediments to Army units on the move because they require specialized procedures and equipment as well as more detailed planning and control than normal operations. A crossing site’s suitability is highly dependant on riverbank geography. Commanders with accurate riverbank data can increase the speed of crossing operations, both by quickly and accurately determining appropriate sites and by minimizing the amount and type of equipment carried forward to effect the crossings. A previous study examined how conventional terrain analysis would be used to determine suitable crossing sites. In that study, there was a 16 % acceptable site selection rate for remotely determined crossing sites. The most common problem, which was not detectable using conventional techniques, was that bank slope was too steep for vehicles to traverse. This study looks at using a Light Distance and Ranging (LIDAR) digital elevation model (DEM) to improve acceptable site selection rate. LIDAR data were collected at the sites identified in the previous study and inspected to see if the DEM would provide the information and resolution necessary to improve crossing site identification. The DEM was compared to

Barry A. Coutermarsh July; Barry A. Coutermarsh

2003-01-01T23:59:59.000Z

482

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

483

Urban modeling based on segmentation and regularization of airborne lidar point clouds  

E-Print Network (OSTI)

This paper presents an approach to process raw lidar 3-D point clouds over urban area and extract terrain, buildings and other urban features. In the initial step, “non-ground points ” are separated from ground points using a one dimensional filtering process based on the slope between two consecutive points in the point cloud and the terrain elevation in the vicinity of the points. In the next step, the non-ground point dataset is processed to segment individual buildings. This is accomplished by using a 3-D regional growing approach. At the end of this step, each lidar point is attributed to a building. The first step towards building reconstruction is to obtain an approximate footprint of the building, which is accomplished by extracting the points on the building boundary by a modified convex hull algorithm. Once the footprint boundary points are found, their edges are regularized by using a least squares model to form the final building shape. Mathematic formulation of 3D region growing and boundary regularization is presented. Tests results of reconstructed buildings over complex urban areas are reported. 1.

Aparajithan Sampath; Jie Shan

2004-01-01T23:59:59.000Z

484

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

485

Nocturnal Low-Level-Jet-Dominated Atmospheric Boundary Layer Observed by a Doppler Lidar over Oklahoma City during JU2003  

Science Conference Proceedings (OSTI)

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 ...

Yansen Wang; Cheryl L. Klipp; Dennis M. Garvey; David A. Ligon; Chatt C. Williamson; Sam S. Chang; Rob K. Newsom; Ronald Calhoun

2007-12-01T23:59:59.000Z

486

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

487

Lidar Observation of the Cirrus Cloud in the Tropopause at Chung-Li (25°N, 121°E)  

Science Conference Proceedings (OSTI)

The authors have detected a cirrus cloud near the tropopause by using a lidar system located at Chung-Li, Taiwan (25°N, 121°E). The cloud usually appeared between the month of May and September. In 1993–95, the cloud was observed almost 50% of ...

J. B. Nee; C. N. Len; W. N. Chen; C. I. Lin

1998-06-01T23:59:59.000Z

488

Theory for Dual-Wavelength C02 Lidar Method to Distinguish Ice, Mixed-Phase, and Water Clouds  

Science Conference Proceedings (OSTI)

An analytical study shows that the ratio of backscatter from ice particles at two CO2 lidar wavelengths is substantially different from the ratio from water drops. This forms the basis for a new method to discriminate between ice, water, and ...

Wynn L. Eberhard

1995-02-01T23:59:59.000Z

489

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

490

Daytime Mixed Layer over the Santiago Basin: Description of Two Years of Observations with a Lidar Ceilometer  

Science Conference Proceedings (OSTI)

Two years of high-resolution backscatter profiles obtained with a commercial lidar ceilometer in Santiago Basin (33.5°S, 70.6°W) are analyzed. The generally large aerosol load in the Santiago atmospheric boundary layer (ABL) facilitates the use ...

Ricardo C. Muñoz; Angella A. Undurraga

2010-08-01T23:59:59.000Z

491

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

492

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

493

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.

494

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

495

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

496

Twenty-Four-Hour Observations of the Marine Boundary Layer Using Shipborne NOAA High-Resolution Doppler Lidar  

Science Conference Proceedings (OSTI)

Shipborne observations obtained with the NOAA high-resolution Doppler lidar (HRDL) during the 1999 Nauru (Nauru99) campaign were used to study the structure of the marine boundary layer (MBL) in the tropical Pacific Ocean. During a day with weak ...

Volker Wulfmeyer; Tijana Janji?

2005-11-01T23:59:59.000Z

497

Polar Stratospheric Cloud Observations in the 2006/07 Arctic Winter by Using an Improved Micropulse Lidar  

Science Conference Proceedings (OSTI)

The potential of a new improved version of micropulse lidar (MPL-4) on polar stratospheric cloud (PSC) detection is evaluated in the Arctic over Ny-Ålesund (79°N, 12°E), Norway. The campaign took place from January to February 2007 in the frame ...

Carmen Cordoba-Jabonero; Manuel Gil; Margarita Yela; Marion Maturilli; Roland Neuber

2009-10-01T23:59:59.000Z

498

Prediction and visualization of GPS multipath signals in urban areas using LiDAR Digital Surface Models and building footprints  

Science Conference Proceedings (OSTI)

This paper explains a ray tracing method which is applied to prediction and visualization of diffracted and reflected GPS signals in dense urban areas. Reflected and diffracted signals can have a detrimental effect on GPS positioning accuracy especially ... Keywords: 3D visualization, GPS multipath, LiDAR

Jing Li; George Taylor; David Kidner; Mark Ware

2008-11-01T23:59:59.000Z

499

Surface-enhanced raman optical data storage system  

DOE Patents (OSTI)

A method and apparatus for a Surface-Enhanced Raman Optical Data Storage (SERODS) System is disclosed. A medium which exhibits the Surface Enhanced Raman Scattering (SERS) phenomenon has data written onto its surface of microenvironment by means of a write-on procedure which disturbs the surface or microenvironment of the medium and results in the medium having a changed SERS emission when excited. The write-on procedure is controlled by a signal that corresponds to the data to be stored so that the disturbed regions on the storage device (e.g., disk) represent the data. After the data is written onto the storage device it is read by exciting the surface of the storage device with an appropriate radiation source and detecting changes in the SERS emission to produce a detection signal. The data is then reproduced from the detection signal.

Vo-Dinh, Tuan (Knoxville, TN)

1991-01-01T23:59:59.000Z

500

Raman/FTIR spectroscopy of oil shale retort gases  

DOE Green Energy (OSTI)

A Raman facility was assembled in order to aid in the evaluation of the feasibility of using Raman or FTIR spectroscopy for analyzing gas mixtures of interest in oil shale. Applications considered in oil shale research included both retort monitoring and laboratory kinetic studies. Both techniques gave limits of detection between 10 and 1000 ppM for ten representative pertinent gases. Both techniques are inferior as a general analytical technique for oil shale gas analysis in comparison with mass spectroscopy, which had detection limits between 1 and 50 ppM for the same gases. The conclusion of the feasibility study was to recommend that mass spectroscopic techniques be used for analyzing gases of interest to oil shale.

Richardson, J.H.; Monaco, S.B.; Sanborn, R.H.; Hirschfeld, T.B.; Taylor, J.R.

1982-08-01T23:59:59.000Z