Infrared intrusion detector with pyroelectric sensor and charge

Details Infrared intrusion detector with pyroelectric sensor and charge Infrared intrusion detector with pyroelectric sensor and charge

1981-09-18

1983-11-29

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250340, 250370, 340600, G08B 1318

Patent

active

044183356

ABSTRACT:
An infrared intrusion detector, utilizing as a sensor element a pyroelectric detector element, accomplishes evaluation of the output signal of the detector element with a charge amplifier, for instance by means of a capacitive feedback coupled operational amplifier, the output signal of which is reset at certain time intervals. The evaluation circuit operates independently of the detector capacitance and therefore enables optimum utilization of the pyroelectrical properties. By virtue of the short-circuit operation and the low ohmic properties of the circuit there is obtained a particularly good non-sensitivity against external disturbances and low noise and increased sensitivity.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 4179691 (1979-12-01), Keller
patent: 4341012 (1982-07-01), Fripp et al.

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