Intrusion detector

Details Intrusion detector Intrusion detector

1975-09-12

1976-12-14

Trafton, David L.

Communications: electrical

Systems

Call station

250338, 250342, 340228R, G08B 1318

Patent

active

RE0290823

ABSTRACT:
A simple optical system collects and applies radiation from a predetermined field of view onto a thermopile detector. The thermopile detector has a plurality of rows of thermocouples having all active junctions with alternate polarity which are aligned in columns of the same polarity, whereby in response to an object moving across the thermopile an output signal is produced of alternately changing polarity. Logic circuitry is provided for processing the signals from the thermopile in a predetermined polarity sequence to discriminate against false alarms and for indicating the presence of an intruder and sounding an alarm.

REFERENCES:
patent: 3036219 (1962-05-01), Thompson
patent: 3056106 (1962-09-01), Hendricks
patent: 3267727 (1966-08-01), Benzinger
patent: 3354309 (1967-11-01), Volkovisky
patent: 3444544 (1969-05-01), Pearson et al.
patent: 3476938 (1969-11-01), Jankowitz et al.
patent: 3524180 (1970-08-01), Cruse
patent: 3631434 (1971-12-01), Schwartz
patent: 3727057 (1973-04-01), Higby et al.

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