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Optics Letters

Optics Letters


  • Vol. 23, Iss. 16 — Aug. 15, 1998
  • pp: 1316–1318

Thermal grating velocimetry

D. J. W. Walker, R. B. Williams, and P. Ewart  »View Author Affiliations

Optics Letters, Vol. 23, Issue 16, pp. 1316-1318 (1998)

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A method is reported for time- and space-resolved nonintrusive velocimetry of high-speed gas flows by measurement of the Doppler shift of light scattered from a laser-induced thermal grating. The principle is demonstrated by use of a pulsed frequency-doubled Nd:YAG laser to induce a thermal grating in NO2 seeded into an argon flow. Signals are generated by Bragg scattering of probe beams at the fundamental frequency of the same Nd:YAG laser. Flow velocities in the range 30–180 ms-1 are measured, in agreement with values obtained with a Pitot tube. The measurement uncertainties obtained indicate that a precision of 1% is feasible for flows at Mach 1.

© 1998 Optical Society of America

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.7250) Remote sensing and sensors : Velocimetry

D. J. W. Walker, R. B. Williams, and P. Ewart, "Thermal grating velocimetry," Opt. Lett. 23, 1316-1318 (1998)

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