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Accuracy and uncertainty of single-shot, nonresonant laser-induced thermal acoustics

Schlamp, Stefan and Hornung, Hans G. and Sobota, Thomas H. and Cummings, Eric B. (2000) Accuracy and uncertainty of single-shot, nonresonant laser-induced thermal acoustics. Applied Optics, 39 (30). pp. 5477-5481. ISSN 0003-6935. http://resolver.caltech.edu/CaltechAUTHORS:SCHLao00

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Abstract

We study the accuracy and uncertainty of single-shot nonresonant laser-induced thermal acoustics measurements of the speed of sound and the thermal diffusivity in unseeded atmospheric air from electrostrictive gratings as a function of the laser power settings. For low pump energies, the measured speed of sound is too low, which is due to the influence of noise on the numerical data analysis scheme. For pump energies comparable to and higher than the breakdown energy of the gas, the measured speed of sound is too high. This is an effect of leaving the acoustic limit, and instead creating finite-amplitude density perturbations. The measured thermal diffusivity is too large for high noise levels but it decreases below the predicted value for high pump energies. The pump energy where the error is minimal coincides for the speed of sound and for the thermal diffusivity measurements. The errors at this minimum are 0.03% and 1%, respectively. The uncertainties for the speed of sound and the thermal diffusivity decrease monotonically with signal intensity to 0.25% and 5%, respectively.


Item Type:Article
Additional Information:© Copyright 2000 Optical Society of America. Received 14 February 2000; revised manuscript received 22 June 2000. This research was supported by Advanced Projects Research, Inc. and by NASA Langley Research Center under NASA contract NAS1-99016.
Group:GALCIT
Subject Keywords:Four-wave mixing; Metrology; Diffraction gratings
Record Number:CaltechAUTHORS:SCHLao00
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SCHLao00
Alternative URL:http://www.opticsinfobase.org/abstract.cfm?URI=ao-39-30-5477
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7690
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:22 Mar 2007
Last Modified:19 Sep 2016 17:53

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