Optical device for measuring speed

Details Optical device for measuring speed Optical device for measuring speed

1993-10-27

1996-09-17

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

180169, G01P 336, B60T 716

Patent

active

055573959

ABSTRACT:
A device for measuring the speed of an object. The device includes a spatial filter scheme to provide quick-response photodetectors and an efficient use of light. The device projects light onto the object by a light source 1, and the light reflected by the object is received by a lens. This light passes through aperture stop 4 and strikes prism array 7, where it is split alternately into two paths at a fixed pitch with respect to the optical axis. The two split beams are received respectively by two photodetectors. The speed of the object moving relative to the measuring device can be calculated based on the data collected by photodetectors.

REFERENCES:
patent: 3865487 (1975-02-01), Andermo
patent: 3888589 (1975-06-01), Swift
patent: 3994583 (1976-11-01), Hutchins
patent: 4961643 (1990-10-01), Sakai et al.

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