Intrusion detection device

Details Intrusion detection device Intrusion detection device

1988-05-18

1990-02-20

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250221, 340557, G08B 1318

Patent

active

049030094

ABSTRACT:
An intrusion detection device which comprises a radiation emitter arranged to project a beam of infrared radiation toward a field of view and means for receiving the radiation of the beam reflected from the field of view. The receiving means is arranged to generated a signal indicative of the distance from the device at which the beam has between reflected by the field of view during a selected time period. Means is also provided for storing a reference signal which is indicative of the distance of reflection of the beam from the field of view during a reference time period. Further means is provided for comparing a signal from a selected time period with the reference signal and for generating an output signal if the signal differs from the reference signal in a preselected manner.

REFERENCES:
patent: 3875403 (1975-04-01), Svensson
patent: 4242743 (1980-12-01), Salem
patent: 4310756 (1982-01-01), Sick et al.
patent: 4319332 (1982-03-01), Mehnert
patent: 4384280 (1983-05-01), Haag
patent: 4514625 (1985-04-01), Heiland
patent: 4521106 (1985-06-01), Lambeth
patent: 4656462 (1987-04-01), Araki et al.

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