Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-05-30
1991-05-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022728, H01J 516
Patent
active
050177729
ABSTRACT:
A fiber optic probe sensor for accurate measurement of displacement of a target over very small distances is disclosed. The probe sensor is comprised of plurality of light emitting fibers exclusively occupying a central region and connected to a light source for illuminating the target; a first and second plurality of light receiving fibers arrayed in two concentric regions exterior to and at two different distances from the central region, and means for measuring reflected light received from the target and for generating an output proportional to the light received and independent of target reflectivity or light source variation.
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Kist, Rainer, SPIE vol. 1011 Fiber Optic Sensors III (1988), pp. 81-119.
BEI Electronics, Inc.
Nelms David C.
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