Doppler velocimeter and apparatus using the same

Details Doppler velocimeter and apparatus using the same Doppler velocimeter and apparatus using the same

1991-05-21

1993-01-12

Lobo, Ian J.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

G01P 336

Patent

active

051794187

ABSTRACT:
This invention is characterized in that a light beam from a light source is made to enter a diffraction grating and .+-. nth-order (n=1,2, . . . ) diffracted lights from the diffraction grating are made to enter a moving object at an angle substantially equal to the angle of intersection of the angles of diffraction of the two diffracted lights from the diffraction grating. As a result, the two diffracted lights are converged by a lens system provided between the diffraction grating and the light source on the moving object and intersect with each other. Scattered light subjected to Doppler shift by the moving object is detected by photodetector thereby detecting the velocity information of the moving object.

REFERENCES:
patent: 4148585 (1979-04-01), Bargeron et al.
patent: 4696568 (1987-09-01), Weistra
patent: 4732479 (1988-03-01), Tanaka et al.
patent: 4948257 (1990-08-01), Kaufman et al.
Oldengarm et al., Journal of Physics E: Scientific Instruments, 1975, vol. 8.
Eiju et al., Applied Optics, vol. 20, #22, Nov. 15, 1981.
Greated et al., Electro-Optics/Laser International '76 UK, Mar. 9-11, 1976.

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