Intrusion detection systems employing automatic sensitivity adju

Details Intrusion detection systems employing automatic sensitivity adju Intrusion detection systems employing automatic sensitivity adju

1976-07-19

1977-12-20

Yusko, Donald J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340258B, 340276, G08B 1318

Patent

active

040645096

ABSTRACT:
An automatic test circuit for a photo electric intrusion system incorporates an electronic attenuator which serves to reduce the sensitivity of the receiver when a light beam does not impinge on a photocell located at the receiver. As soon as the light beam appears on the photocell, the sensitivity of the receiver is increased to a normal operating value. In this manner, if the beam were misaligned to cause less light to impinge on the photocell, the receiver would indicate an alarm condition to thereby inform a user of the problem.

REFERENCES:
patent: 3225304 (1965-12-01), Richards
patent: 3652791 (1972-03-01), Shuey
patent: 3859647 (1975-01-01), Ross
patent: 3879719 (1975-04-01), Buckley et al.
patent: 3995221 (1976-11-01), MacDonald

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