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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 12 — Jun. 15, 2007
  • pp: 1689–1691

Pressure measurement in supersonic air flow by differential absorptive laser-induced thermal acoustics

Roger C. Hart, G. C. Herring, and R. Jeffrey Balla  »View Author Affiliations

Optics Letters, Vol. 32, Issue 12, pp. 1689-1691 (2007)

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Nonintrusive, off-body flow barometry in Mach 2 airflow has been demonstrated in a large-scale supersonic wind tunnel using seedless laser-induced thermal acoustics (LITA). The static pressure of the gas flow is determined with a novel differential absorption measurement of the ultrasonic sound produced by the LITA pump process. Simultaneously, the streamwise velocity and static gas temperature of the same spatially resolved sample volume were measured with this nonresonant time-averaged LITA technique. Mach number, temperature, and pressure have 0.2%, 0.4%, and 4% rms agreement, respectively, in comparison with known free-stream conditions.

© 2007 Optical Society of America

OCIS Codes
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.7250) Remote sensing and sensors : Velocimetry

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 15, 2007
Revised Manuscript: April 11, 2007
Manuscript Accepted: April 12, 2007
Published: June 5, 2007

Roger C. Hart, G. C. Herring, and R. Jeffrey Balla, "Pressure measurement in supersonic air flow by differential absorptive laser-induced thermal acoustics," Opt. Lett. 32, 1689-1691 (2007)

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