Abstract

Results of supersonic molecular flow-velocity measurements using inverse Raman spectroscopy are reported for the first time to our knowledge. Because of potential wind-tunnel applications, flowing N2 molecules are probed directly, and their flow velocity, temperature, and density are measured. The uncertainties are less than 5% for the velocity measurements and about 10% for the temperature and density measurements. To achieve the quoted precision, I2 fluorescence, I2 saturated-absorption, and differential-detection techniques are used to stabilize the probe laser, provide an absolute-frequency reference, and reduce detection noise, respectively.

© 1983 Optical Society of America

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