Pyroelectric infrared sensor

Details Pyroelectric infrared sensor Pyroelectric infrared sensor

1989-08-29

1990-11-27

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503381, 2503384, G01J 502, G01J 500

Patent

active

049738437

ABSTRACT:
A pyroelectric sensor senses the infrared rays radiated from the human body and outputs the detected infrared rays as an electric signal. It detects the trespass of somebody on a room and is used for the prevention of crimes and the like. The pyroelectric sensor includes a substrate, an element-pair disposed on the surface of the substrate and an amplification circuit for amplifying the current signals output from the element-pair. The substrate is composed of a material having a thermal conductivity as low as not more than 0.04 cal/cm sec.degree. C. so as to prevent the heat from being released through the substrate. A hole is formed in the substrate. The amplification circuit amplifies the current signals of the element-pair, thereby dispensing with the impedance transformation which is inevitable in the prior art. Thus, the sensitivity of detection is improved and the manufacture of the sensor is facilitated.

REFERENCES:
patent: 4110616 (1978-08-01), Porter et al.
patent: 4284888 (1981-08-01), Appleby
patent: 4383174 (1983-05-01), Matsumura et al.
patent: 4469943 (1984-09-01), Turnbull
patent: 4555414 (1985-11-01), Hoover et al.
patent: 4808822 (1989-02-01), Manning et al.
Buchanan, "Ceramic Materials for Electronics", Marcel Dekker Inc. 1986, p. 7.
Weast, "CRC Handbook of Chemistry and Physics" CRC Press, 1974-1975 55th Edition, pp. E4, E5, E17 and E206.

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