Laser doppler velocimeter

Details Laser doppler velocimeter Laser doppler velocimeter

1981-02-19

1983-08-09

Buczinski, S. C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

332 751, 356349, G01P 336

Patent

active

043975500

ABSTRACT:
A laser Doppler velocimeter using two laser beams, when used for the measurement of the flow velocity of slow moving particles, fails to provide the measurement because the Doppler frequency and the pedestal component overlap on the power spectrum. This difficulty is eliminated by having a prism disposed in the path of one of the laser beams used. When this prism is continuously moved, the pedestal component and the Doppler frequency are separated from each other on the power spectrum, enabling the velocimeter to effect the measurement easily and accurately.

REFERENCES:
patent: 3560874 (1971-02-01), Duguay
patent: 3649125 (1972-03-01), Lehmann
patent: 3825348 (1974-07-01), Nomarski et al.
patent: 4176950 (1979-12-01), Franke
patent: 4278351 (1981-07-01), Frosch et al.
Balasubramanian et al., Photogrammetric Eng. and Remote Sensing, vol. 42, No. 12, 12-1976, pp. 1529; 356-349.
Matsuda et al., Applied Optics, vol. 20, No. 22, Nov. 15, 1981.
Priezzhev et al., Moscow Univ. Phys. Bulletin, vol. 34, No. 6, 1979.

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