Method of and apparatus for measuring speed

Details Method of and apparatus for measuring speed Method of and apparatus for measuring speed

1989-02-08

1990-10-09

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356373, G01P 336

Patent

active

049616439

ABSTRACT:
A speed measuring apparatus, for instance for measuring the speed of a vehicle over the ground, comprises a plurality of photodetectors arranged to view consecutive regions along parallel light paths. The photodetectors are arranged as two sets of alternating photodetectors whose combined outputs are subtracted to provide a signal whose frequency represents speed and is insensitive to height.

REFERENCES:
patent: 3486032 (1969-12-01), Cufflin
patent: 3994583 (1976-11-01), Hutchins
patent: 4040741 (1977-08-01), Swift
patent: 4273430 (1981-06-01), Fritsche et al.
patent: 4725136 (1988-02-01), McCullough et al.

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