Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-10-04
1991-04-30
Willis, Davis L.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, 25023110, 250237R, 84724, G01V 904
Patent
active
050120867
ABSTRACT:
An optoelectronic pickup for providing an electrical output signal that is a linear representation of the relative displaced position of a mounted string. A collimated light source enables high contrast shadows of the string to be sensed by a photodetector. It also excludes information about the displaced position of the string in all directions except those along a single axis. The photodetector has a large flat surfaced area providing an output signal throughout the entire normal operating displacement range of the string. The design of the detector system results in a linear relationship between the relative position of the string and the total integrated illumination of the active area of the photodetector and hence the electrical output signal. A dual detector scheme allows the pickup to be immune to stray light and also to noise pickup on the lead wires.
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Messinger Michael
Willis Davis L.
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