Abstract

A method of velocimetry of gaseous flows based on resonant degenerate four-wave mixing (DFWM) is described. Spatially resolved velocity measurements are derived from Doppler shifts of DFWM signals generated in NO-seeded into flows of air or N2. Velocities in the range of 60 to 200 ms−1 have been measured with an uncertainty of ±30 ms−1.

© 1994 Optical Society of America

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