High output differential pyroelectric sensor

Details High output differential pyroelectric sensor High output differential pyroelectric sensor

1981-07-29

1984-04-03

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250349, G01J 510

Patent

active

044410239

ABSTRACT:
A dual pyroelectric crystal sensor suitable for infrared intruder alarms and the like having two separate closely spaced identical pyroelectric crystal detectors connected in parallel opposition. The sensor includes a single ended field effect transistor amplifier with the entire sensor encapsulated in a TO-5 can. The two crystals each have one end cemented to a ceramic substrate in a cantilevered fashion, permitting shock or vibration to affect each crystal equally. Therefore, voltages due to the piezoelectric responses of the crystals are equal and cancel. If both crystals are irradiated by a common heat source, the pyroelectric generated voltages will cancel. If either crystal is irradiated separately, an output voltage will be produced.

REFERENCES:
patent: 3877308 (1975-04-01), Taylor
patent: 3896309 (1975-07-01), Halsor et al.
patent: 3940974 (1976-03-01), Taylor
patent: 4060729 (1977-11-01), Byer et al.
patent: 4110616 (1978-08-01), Porter et al.
patent: 4258260 (1981-03-01), Obara et al.
patent: 4334343 (1982-06-01), Wakat, Jr. et al.

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