Optical sensing technique providing built in test
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
Jun 12, 1991
filing date -
Jun 12, 1991
priority date (Note) -
Expired
status (Latency Note)
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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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