Direction sensitive laser velocimeter

Details Direction sensitive laser velocimeter Direction sensitive laser velocimeter

1979-04-06

1981-03-10

Buczinski, S. C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356356, 356358, G01P 336

Patent

active

042550483

ABSTRACT:
A laser velocimeter that determines the direction of movement of particles. A laser produces a transmitted beam that illuminates the volume under investigation. The backscattered light is divided into two equal intensity beams. A first part of a sample of the transmitted beam is mised with one of the two equal intensity beams and applied to a first photodetector. A second part of the sample is phase shifted by 90.degree., mixed with the other of the two equal intensity beams and applied to a second photodetector. The output of the first photodetector is phase shifted by -90.degree. and then multiplied with the output of the second photodetector to produce a signal indicative of direction of movement.

REFERENCES:
patent: 3024456 (1962-03-01), Varian et al.
patent: 3360987 (1968-01-01), Flower et al.
patent: 3601491 (1971-08-01), Vaniz
patent: 3753616 (1973-08-01), Goethert
patent: 3771875 (1973-11-01), Russo
patent: 3838924 (1974-10-01), Flower et al.
patent: 3915572 (1975-10-01), Orloff

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