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Simultaneous velocimetry and thermometry of air by use of nonresonant heterodyned laser-induced thermal acoustics

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Abstract

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

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