Intrusion detection system for operating industrial machines wit

Details Intrusion detection system for operating industrial machines wit Intrusion detection system for operating industrial machines wit

1987-11-10

1989-04-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, G01V 904

Patent

active

048188662

ABSTRACT:
An optical detection system of the sort adapted to enable and/or disable the operation of an associated industrial machine when an appropriate intrusion is detected. The optical intrusion detection system is adapted to have a variable sensitivity, whereby it can be set to respond to the intrusion of an object of a first size during one phase of operation of said machine and to an object of a second size during another phase of the operation of said machine.

REFERENCES:
patent: 3551683 (1970-12-01), Tothill
patent: 3805061 (1974-04-01), De Missimy et al.
patent: 4015122 (1977-03-01), Rubinstein
patent: 4249074 (1981-02-01), Zettler et al.
patent: 4266124 (1981-05-01), Weber et al.

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