Dual wavelength sensor which employs object as part of a corner

Details Dual wavelength sensor which employs object as part of a corner Dual wavelength sensor which employs object as part of a corner

1986-06-18

1987-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, G01N 2186, G01V 904

Patent

active

046970894

ABSTRACT:
Two emitters, producing light at different wavelengths, and a single receiver provide an optical sensor useful for detecting the presence or position of objects having surfaces which do not totally reflect incident light.

REFERENCES:
patent: 3932763 (1976-01-01), Weinstein
patent: 4557435 (1985-12-01), Reishus
patent: 4564085 (1986-01-01), Melocik et al.

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