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Differential pyroelectric detector

  • US 4,384,207 A
  • Filed: 01/23/1981
  • Issued: 05/17/1983
  • Est. Priority Date: 01/23/1981
  • Status: Expired due to Term
First Claim
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1. A pyroelectric detector comprising:

  • (a) a body of pyroelectric material having a first surface for receiving radiation and a second surface;

    (b) a relatively thin coating on said first surface of material which is radiation absorbing and transmitting and which is electrically conducting;

    (c) a pair of areas in spaced-apart relation on said second surface, each of said areas being of radiation reflecting and electrically conducting material, each being relatively thicker than said coating on said first surface;

    (d) a first heat sensitive charge generator defined by one of said areas, the portion of said coating in registry with said one area and the region of said body of pyroelectric material therebetween; and

    (e) a second heat sensitive charge generator defined by the other of said areas, the portion of said coating in registry with said other area and the region of said body of pyroelectric material therebetween;

    (f) whereby when radiation is absorbed by either of said heat sensitive charge generators an electric current flows in a circuit connected to said areas thereby providing an indication of said radiation.

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