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Laser-induced thermal-acoustic velocimetry with heterodyne detection

Schlamp, Stefan and Cummings, Eric B. and Sobota, Thomas H. (2000) Laser-induced thermal-acoustic velocimetry with heterodyne detection. Optics Letters, 25 (4). pp. 224-226. ISSN 0146-9592.

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Laser-induced thermal acoustics (LITA) was used with heterodyne detection to measure simultaneously and in a single laser pulse the sound speed and flow velocity of NO2-seeded air in a low-speed wind tunnel up to Mach number M = 0.1. The uncertainties of the velocity and the sound speed measurements were ~0.2 m/s and 0.5%, respectively. Measurements were obtained through a nonlinear least-squares fit to a general, analytic closed-form solution for heterodyne-detected LITA signals from thermal gratings. Agreement between theory and experiment is exceptionally good.

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Additional Information:© 2000 Optical Society of America. Received September 20, 1999. This study was supported by Advanced Projects Research, Inc., and by NASA Langley Research Center under NASA contract NAS1-99016.
Subject Keywords:Diffraction gratings; Temperature measurement; Vibration analysis; Nonlinear optics; Four-wave mixing
Issue or Number:4
Record Number:CaltechAUTHORS:SCHLol00
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5894
Deposited By: Lindsay Cleary
Deposited On:07 Nov 2006
Last Modified:02 Oct 2019 23:27

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