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

R. C. Hart | Zendy; G. C. Herring | Zendy; R. Jeffrey Balla | Zendy

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

Author(s) -

R. C. Hart,

G. C. Herring,

R. Jeffrey Balla

Publication year - 2007

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.32.001689

Subject(s) - supersonic speed , mach number , choked flow , optics , materials science , static pressure , acoustics , airflow , flow (mathematics) , wind tunnel , pressure measurement , flow measurement , laser , absorption (acoustics) , transonic , mechanics , physics , aerodynamics , thermodynamics

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.

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