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Active Pyroelectric Infrared DetectorA 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.
Document ID
19960002732
Acquisition Source
Legacy CDMS
Document Type
Other - Patent Application
Authors
Zuckerwar, Allan J. (NASA Langley Research Center Hampton, VA, United States)
Zalameda, Joseph N. (NASA Langley Research Center Hampton, VA, United States)
Mina, Joseph M. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
January 30, 1995
Subject Category
Instrumentation And Photography
Report/Patent Number
NAS 1.71:LAR-15281-1
Accession Number
96N12741
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-LAR-15281-1
Patent Application
US-PATENT-APPL-SN-380176

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