Nonresonant laser-induced thermal acoustics is used with heterodyne detection to measure temperature (285–295 K) and a single component of velocity (20–150 m/s) in an atmospheric pressure, subsonic, unseeded air jet. Good agreement is found with Pitot-tube measurements of velocity (0.2% at 150 m/s and 2% at 20 m/s) and the isentropic expansion model for temperature (0.3%).
© 2001 Optical Society of America
Roger C. Hart, R. Jeffrey Balla, and G. C. Herring, "Simultaneous velocimetry and thermometry of air by use of nonresonant heterodyned laser-induced thermal acoustics," Appl. Opt. 40, 965-968 (2001)