Abstract
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
Full Article | PDF ArticleMore Like This
Stefan Schlamp, Eric B. Cummings, and Thomas H. Sobota
Opt. Lett. 25(4) 224-226 (2000)
Roger C. Hart, G. C. Herring, and R. Jeffrey Balla
Opt. Lett. 27(9) 710-712 (2002)
Roger C. Hart, R. Jeffrey Balla, and G. C. Herring
Appl. Opt. 40(6) 965-968 (2001)