Laser doppler velocimeter

Details Laser doppler velocimeter Laser doppler velocimeter

1995-03-21

1996-12-24

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356 28, G01D 336

Patent

active

055877850

ABSTRACT:
A laser Doppler velocimeter in which laser light whose frequency changes continuously at least for a fixed time duration is branched into at least two beams, and the at least two branched beams are respectively transmitted by at least one pair of optical fibers having an optical path difference therebetween, and are focused onto a region to be measured by at least one focusing device. The scattered light of the laser beams focused in the region to be measured are received by a light-receiving device via at least one incident device. At least one Doppler shift frequency in the region to be measured is calculated on the basis of the frequency of a signal of the scattered light received by the light-receiving device, the optical path difference, and a rate of change of the frequency of the laser light. The flow velocity and the direction of the flow velocity are calculated from the calculated Doppler shift frequency.

REFERENCES:
patent: 5327222 (1994-07-01), Takamiya et al.
O. Sasaki et al, Applied Optics, vol. 19, No. 8, Apr. 1980, p. 1306.
The Japan Society of Applied Physics and Related Societies, 28a-c-7, "Two-dimensional LDV using a LD frequency change and self-mixing effect", Shizuoka University Taku Aoshima and Junji Ohtsubo.

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