Apparatus for measuring movement of light scattering bodies in a

Details Apparatus for measuring movement of light scattering bodies in a Apparatus for measuring movement of light scattering bodies in a

1988-10-25

1990-12-25

Tarcza, Thomas H.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356338, 356342, 128691, G01P 336, A61B 502

Patent

active

049798189

ABSTRACT:
A velocity distribution measurement apparatus directs light at an object, detects scattered light from the object, photoelectrically converts the light and subjects it to signal processing to obtain velocity distribution characteristics of the object, by detecting a speckle pattern formed by interference between rays of light scattering from points on the object. The apparatus consists mainly of a laser beam source; an optical deflector for scanning the laser at a certain frequency; an optical system for projecting the light scanned by the deflector onto the object; a detector for detecting the speckle pattern; and signal processing means for analyzing detector outputs to establish the speckle pattern variations for each scanning frequency at which the optical deflector performs scanning, in order to obtain information on velocity distribution in the object. The optical system is easy to adjust, and measurement and processing can be accomplished in a relatively short time.

REFERENCES:
patent: 3737233 (1973-06-01), Blau et al.
patent: 4715706 (1987-12-01), Wang
patent: 4721385 (1988-01-01), Jelalian et al.
patent: 4743107 (1988-05-01), Aizu et al.

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