Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-07-03
1992-09-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022724, H01J 516
Patent
active
051499630
ABSTRACT:
A fiber-optic position sensor includes a light source, a light detector that produces analog electrical signals proportional to the intensity of incident light on the detector, and fiber-optic bundles for transmitting illumination light to an object, transmitting reflected light from the object to the detector, and reference light from the light source directly to the detector. Electronic circuits are also provided for use with the optical position sensor for processing the signals from the detector to determine the position of the object. The detector is a photovoltaic bi-cell having two discrete regions, the first being used to detect the reference light and the second being used to detect the reflected light. A mounting block configuration is also provided to conveniently hold the optical elements.
REFERENCES:
patent: 3758784 (1973-09-01), Vischulis
patent: 4631401 (1986-12-01), Parkhurst et al.
patent: 4687927 (1987-08-01), Iwamoto et al.
patent: 4897542 (1990-01-01), Dakin et al.
Bulletin MTI-1000 "Fotonic.TM. Sensor" (From Instruments Division, Mechanical Technology Inc.) Jun. 1986.
Morgan Christopher H.
Nelms David C.
Parker Hannifin Corporation
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