Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-05-05
1982-01-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 4, G01C 308
Patent
active
043096182
ABSTRACT:
A method and apparatus are shown for precision distance or displacement measurement using a light source and a detector. A light emitting diode or laser are typical sources, and a photodiode or phototransistor are typical detectors. Light from the source is directed towards the detector directly, or reflected onto the detector by a reflective surface. By tilting the axis of the light source and detector, high sensitivity is possible. The effect of the tilted axes may be obtained by the use of two reflective surfaces. Typical resolution is on the order of 5 microinches over a range of 50,000 microinches (i.e., one part in 10.sup.4) using simple associated electronics, with higher resolution possible.
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"Photoswitch" Type 22/23 Series 4000, Electronics Corp. of America, Oct. 1977.
"Optron," Types OPB706 & OPB707, Bulletin No. 668, Oct. 1977.
Carter, Jr. Herman L.
Hart Robert R.
Weissmann Gerd F. H.
Bell Telephone Laboratories Incorporated
Hostetter Darwin R.
Nelms David C.
Wilde Peter V. D.
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