Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-12-28
1989-06-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, 250231SE, 324260, 350374, G02F 101
Patent
active
048432326
ABSTRACT:
An electro-optic speed sensor for sensing the speed of rotation of a rotating sending unit which includes an optical switch transducer for sensing disturbances in a magnetic field caused by the passage of a rotating magnetic sending wheel on the rotating member. The optical switch transducer uses a Faraday material and provides its signal by rotating the polarity of polarized light from a first source of light having a first bandwidth while allowing a second source of light having a second bandwidth to pass through unaffected. The first and second sources of light are thereafter, reflected within the transducer. The disturbances in the magnetic field generate an optical signal resulting from changes in the Faraday rotation. A photodetector receives the light from the first source to develop an operational signal corresponding to the speed of rotation of the rotating member and light from the second source to check on the continuity of the sensor system.
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Emo Stephen M.
Kinney Terrance R.
Allen Stephone B.
Allied-Signal Inc.
Decker Ken C.
McCormick Jr. Leo H.
Nelms David C.
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