Presence detecting system with self-checking

Details Presence detecting system with self-checking Presence detecting system with self-checking

1974-08-15

1976-07-20

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250209, 340258B, G01D 2104

Patent

active

039708462

ABSTRACT:
This invention relates to presence sensing systems and more particularly to such systems which utilize beams of radiant energy, such as light beams, to detect the presence of a person or an object within a predetermined space. Additionally the invention relates to presence detecting systems combined with self-checking means to ensure that the detection system is operating properly.

REFERENCES:
patent: 3478220 (1969-11-01), Milroy
patent: 3723738 (1973-03-01), Brenner et al.
patent: 3742222 (1973-06-01), Endl
patent: 3764813 (1973-10-01), Clement et al.
patent: 3805061 (1974-04-01), De Missimy et al.

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