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Active Pyroelectric Infrared Detector (1995)

Zalameda, Joseph N. ; Zuckerwar, Allan J. ; Mina, Joseph M.

In: CASI

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Publication Date: 2019-06-28

Description: 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.

Keywords: INSTRUMENTATION AND PHOTOGRAPHY

Type: NAS 1.71:LAR-15281-1

Format: application/pdf

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