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High output differential pyroelectric sensor

  • US 4,441,023 A
  • Filed: 07/29/1981
  • Issued: 04/03/1984
  • Est. Priority Date: 07/29/1981
  • Status: Expired due to Term
First Claim
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1. A differential thermal sensor having compensation for variations in ambient temperature and for mechanical vibration comprising:

  • a first elongate thermal detector having a polarized pyroelectric crystal disposed between two conductive electrodes;

    a second elongate thermal detector identical to said first thermal detector and having a polarized pyroelectric crystal disposed between two conductive electrodes;

    a mounting base, said first detector mounted on said base and extending therefrom in a cantilevered manner, and said second detector mounted on said base adjacent said first detector and extending from said base in a cantilevered manner; and

    a pair of conductors conductively attached to said electrodes of said first and second detectors so as to form a parallel opposing connection of said detectors, said pair of conductors also forming output connections for said sensor.

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