Dual sensitivity intrusion detection system

Details Dual sensitivity intrusion detection system Dual sensitivity intrusion detection system

1981-06-23

1984-03-13

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340501, 340522, 340587, G08B 1322, G08B 2900

Patent

active

044370890

ABSTRACT:
At least two circuits of sensors for detection of human presence are arranged in a protected zone and are capable of producing electric signals when they detect a human presence. In a preferred embodiment, when a human presence is detected by a first sensor circuit, the sensitivity of the sensors of the second sensor circuit is increased.

REFERENCES:
patent: 3074053 (1963-01-01), McDonough
patent: 3967283 (1976-06-01), Clark et al.
patent: 4021796 (1977-05-01), Fawcett, Jr. et al.
patent: 4092643 (1978-05-01), Stolarczyk
patent: 4142187 (1979-02-01), Nakayama
Proceedings 1976 Carnahan Conference on Crime Countermeasures, May 1976, "Progressive Entry Detection System", pp. 89-92.
English translation entitled "Safety with Stotz Burglar Alarm Systems" by Helmut Beigel, of German publication entitled Sicherheit mit Stotz-Alarm Einbruchmeldeanlagen BBC-NACHRICHT No. 12, 1978, pp. 534-539.

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