Low noise photoelectric detector apparatus

Details Low noise photoelectric detector apparatus Low noise photoelectric detector apparatus

1975-09-10

1976-12-07

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250574, 250208, 250553, 250552, 250227, G01N 2132

Patent

active

039964760

ABSTRACT:
A photoelectric sensor includes a photodetector, a lens, and a light source all mounted within a framework for holding the lens with the photodetector and light source located on the central axis of the lens. The photodetector is positioned on the rear side of the lens within the framework at approximately the lens focal point. The light source is positioned to emit light away from the front side of the lens. Structure in the form of an opaque collar is provided for mounting the light source relative to the lens to prevent impingement of spurious light from the light source upon the lens. An object positioned in front of the lens intercepts the emitted light from the light source and reflects it back toward the lens, whereupon it is directed to the photodetector. A signal indicative of the presence of the object is provided by the photodetector responsive to the reflected light.

REFERENCES:
patent: 3555532 (1971-01-01), White et al.
patent: 3561846 (1971-02-01), Kingsland
patent: 3819938 (1974-06-01), Kornrumpf et al.
patent: 3892974 (1975-07-01), Elletson et al.

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