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Title: Widefield laser Doppler vibrometer using high-speed cameras.

Abstract

Abstract not provided.

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1266232
Report Number(s):
SAND2006-2749C
525844
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the SEM Annual conference held June 4-7, 2006 in St. Louis, MO.
Country of Publication:
United States
Language:
English

Citation Formats

Reu, Phillip L., and Hansche, Bruce D.. Widefield laser Doppler vibrometer using high-speed cameras.. United States: N. p., 2006. Web.
Reu, Phillip L., & Hansche, Bruce D.. Widefield laser Doppler vibrometer using high-speed cameras.. United States.
Reu, Phillip L., and Hansche, Bruce D.. Mon . "Widefield laser Doppler vibrometer using high-speed cameras.". United States. doi:. https://www.osti.gov/servlets/purl/1266232.
@article{osti_1266232,
title = {Widefield laser Doppler vibrometer using high-speed cameras.},
author = {Reu, Phillip L. and Hansche, Bruce D.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}

Conference:
Other availability
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  • A laser doppler vibrometer (LDV) is being used for high frequency characterizations of accelerometers at Sandia National Laboratories (SNL). A LDV with high frequency (up to 1.5 MHz) and high velocity (10 M/s) capability was purchased from a commercial source and has been certified by the Primary Electrical Standards Department at SNL. The method used for this certification and the certification results are presented. Use of the LDV for characterization of accelerometers at high frequencies and of accelerometer sensitivity to cross-axis shocks on a Hopkinson bar apparatus is discussed.
  • The application of modern optical techniques to meter calibration and real time measurement of large flowrates is outlined. The basic system consists of a converging device (nozzle) and a miniaturized laser Doppler system integrated inside the wall of a short duct section. Optical access to the flow by means of glass windows is not required anymore. This progress has been made possible by a new technique using two separated semiconductor lasers and signal demodulation. The flowmeter is designed for on-line measurement of flowrates up to 6000 m{sup 3}/h with an uncertainty of 1,2%...0,3%. This is due to the fact thatmore » the centre line velocity at the nozzle exit in the set-up is an excellent measure of the flowrate. For increasing accuracy an additional reference sensor to measure the whole boundary profile while leaving the sensor fixed can be installed optionally. The optical flowmeter can also be adapted to the well established use of orifice plates, but with the disadvantage of increased acquisition time.« less
  • One of our primary goals was to determine how well a laser Doppler vibrometer (LDV) could measure the structural dynamic response of a wind turbine that was parked in the field. We performed a series of preliminary tests in the lab to determine the basic limitations of the LDV for this application. We then instrumented an installed parked horizontal axis wind turbine with accelerometers to determine the natural frequencies, damping, and mode shapes of the wind turbine and rotor as a baseline for the LDV and our other tests. We also wanted to determine if LDV modal information could bemore » obtained from a naturally (wind) excited wind turbine. We compared concurrently obtained accelerometer and LDV data in an attempt to assess the quality of the LDV data. Our test results indicate the LDV can be successfully used in the field environment of an installed wind turbine, but with a few restrictions. We were successful in obtaining modal information from a naturally (wind) excited wind turbine in the field, but the data analysis requires a large number of averaged data sets to obtain reasonable results. An ultimate goal of this continuing project is to develop a technique that will monitor the health of a structure, detect damage, and hopefully predict an impending component failure.« less
  • Abstract not provided.