Laser Doppler anemometer

Details Laser Doppler anemometer Laser Doppler anemometer

1988-08-01

1990-07-10

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356349, G01P 336

Patent

active

049403303

ABSTRACT:
A laser Doppler anemometer includes at least a first and second laser source, an optical system for directing laser beams from the sources to a specific region of a fluid flow containing particles in order to produce a virtual interference fringe pattern and at least one photodetecter positioned for receiving the scattered light from the flowing fluid. At least one of a temperature regulation and current regulation circuit is provided for stabilizing the wavelength of at least one of the laser sources. The first and second laser sources are set to different emission wavelengths and a regulating circuit is provided for maintaining the difference frequency between the first and second sources constant. The difference frequency is in turn utilized to control the temperature regulation and/or current regulation circuit for at least one of the laser sources to achieve stabilized operation thereof.

REFERENCES:
patent: 3877813 (1975-04-01), Hayes et al.
patent: 4373807 (1983-02-01), Gouesbet
patent: 4492464 (1985-01-01), Bourdet
patent: 4511249 (1985-04-01), Frungel
patent: 4666295 (1987-05-01), Devall et al.
Boutier et al, "Laser Velocimeter for Wind Tunnel Measurements", IEEE Transactions on Aerospace and Electronic Systems, vol. AES-14, No. 3, May 1978, pp. 441-454.
J. Oldengarm et al, Optics and Laser Technology, Dec. 1973, vol. 5, No. 6.
G. R. Grant et al, Applied Optics, vol. 12, No. 12, Dec. 1973.

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