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Optics Letters

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  • Vol. 25, Iss. 4 — Feb. 15, 2000
  • pp: 224–226

Laser-induced thermal-acoustic velocimetry with heterodyne detection

Stefan Schlamp, Eric B. Cummings, and Thomas H. Sobota  »View Author Affiliations


Optics Letters, Vol. 25, Issue 4, pp. 224-226 (2000)
http://dx.doi.org/10.1364/OL.25.000224


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Abstract

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 NO><sub>2</sub> -seeded air in a low-speed wind tunnel up to Mach number <i>M</i> =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.

© 2000 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(050.2770) Diffraction and gratings : Gratings
(120.6780) Instrumentation, measurement, and metrology : Temperature
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing

Citation
Stefan Schlamp, Eric B. Cummings, and Thomas H. Sobota, "Laser-induced thermal-acoustic velocimetry with heterodyne detection," Opt. Lett. 25, 224-226 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-4-224


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