Optical sensing technique providing built in test

Details Optical sensing technique providing built in test Optical sensing technique providing built in test

1991-06-12

1993-10-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023114, 25022721, 324175, H01J 314

Patent

active

052508056

ABSTRACT:
An optical apparatus for sensing the motion of an object. A light source transmits light through a first and second optical fiber. The first and second optical fiber are positioned on opposite sides of a modulator or code disk to face each other along an optical path. The modulator has alternating reflective regions and transmissive regions which modulate the light propagating along the optical path as the modulator moves across the optical path. The modulated light is received by the first and second and optical fibers and transported to a predetermined location for evaluation.

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patent: 4091280 (1978-05-01), Ellis et al.
patent: 4617460 (1986-10-01), Tokunaga et al.
patent: 4638155 (1987-01-01), Dorr
patent: 4654523 (1987-03-01), Tanaka
patent: 4767164 (1988-08-01), Yeung
patent: 4870269 (1989-09-01), Jeunhomme et al.

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