Detection system with reduced sensitivity to pin diode effect

Details Detection system with reduced sensitivity to pin diode effect Detection system with reduced sensitivity to pin diode effect

1994-09-23

1995-09-12

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340522, 340521, G08B 1318

Patent

active

054500621

ABSTRACT:
An intrusion detection system, including a microwave device and a light emitting diode, is controlled to alternate their operation so the diode is off and not conducting when the microwave is transmitting. During a period when the LED would otherwise be on to indicate some state of detection, it is cycled off to remove its influence from the microwave transmission and reception. The microwave transmissions are intermittent with relatively long intervals between short transmissions. The diode is switched on during the long interval and off during the transmissions, giving the appearance of a diode that it is always on. The invention has particular utility in apparatus including dual independent channels for detecting intrusion and including one or more light emitting diodes that are energized to indicate the state of one or both channels.

REFERENCES:
patent: 4625199 (1986-11-01), Pantus
patent: 5043703 (1991-08-01), DiPoala et al.
patent: 5077548 (1991-12-01), Dipoala
patent: 5093656 (1992-03-01), Dipoala
patent: 5107249 (1992-04-01), Johnson
patent: 5164703 (1992-11-01), Rickman
patent: 5194848 (1993-03-01), Kerr
patent: 5216410 (1993-06-01), Pildner et al.
patent: 5276427 (1994-01-01), Peterson
patent: 5331308 (1994-07-01), Buccola et al.

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