Active pyroelectric infrared detector

Details Active pyroelectric infrared detector Active pyroelectric infrared detector

1995-01-30

1996-04-16

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

374117, G01J 510

Patent

active

055085466

ABSTRACT:
A noncontact pyroelectric infrared detector is described. A pyroelectric film that also has piezoelectric properties is held in place so that it is free to vibrate. It is electrically stimulated to vibrate at a resonance frequency. The vibrating film forms part of a balanced bridge circuit. As thermal radiation impinges on the film the pyroelectric effect causes the resonance frequency to change, thereby unbalancing the bridge circuit. A differential amplifier tracks the change in voltage across the bridge. The resulting voltage signal is further processed by a bandpass filter and a precision rectifier. The device allows for DC or static temperature measurements without the use of a mechanical chopping device.

REFERENCES:
patent: 4383174 (1983-05-01), Matsummura et al.
patent: 4797840 (1989-01-01), Fraden
patent: 4806760 (1989-02-01), McGlade
patent: 5108576 (1992-04-01), Malmros et al.
patent: 5159936 (1992-11-01), Yelderman et al.

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