Presence detector housing and mount

Details Presence detector housing and mount Presence detector housing and mount

1991-06-10

1993-05-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, G01V 904

Patent

active

052104060

ABSTRACT:
Presence detecting apparatus and housing and mounts therefore are disclosed, the apparatus including control circuitry, an emitter array, detector array, and background compensation sensor mounted and housed to provide a safe and effective detection area characterized by substantially constant detection sensitivity over the defined detection area while avoiding undesired detection of objects present outside the detection area. The emitter array and detector array are mounted and housed so that the detector array is substantially isolated from transmission in the housing of selected electromagnetic signals from the emitter array.

REFERENCES:
patent: 4837430 (1989-06-01), Hasegawa
patent: 4894527 (1990-01-01), Smith
patent: 4912316 (1990-03-01), Yamakawa
patent: 4973837 (1990-11-01), Bradbeer
patent: 5008529 (1991-04-01), Nakamura

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