Opto-electronic sensor

Details Opto-electronic sensor Opto-electronic sensor

1975-05-30

1977-08-09

Wilbur, Maynard R.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250205, G01C 308

Patent

active

040407403

ABSTRACT:
An instrument for giving electrical indications of the distance between two reference points includes a light source, a primary light-sensitive detector and a secondary light-sensitive control detector. Both detectors may be photodiodes. In one embodiment, the light from the source is reflected from a reference plane and is intercepted by the primary detector and by the secondary control detector. The secondary control detector is part of a control loop which adjusts the intensity of the light source in such a manner that the photo current through the secondary control detector remains constant, thus providing compensation for changes in brightness and sensitivity due to aging, soiling and other influences.

REFERENCES:
patent: 2206036 (1940-07-01), Herson
patent: 2489220 (1949-11-01), Herbold
patent: 3679307 (1972-07-01), Zoot et al.
patent: 3778157 (1973-12-01), Brelot et al.
patent: 3802780 (1974-04-01), Helm et al.
patent: 3815994 (1974-06-01), Peckham
patent: 3885872 (1975-05-01), Howe, Jr. et al.

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