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Infrared intrusion detector with pyroelectric sensor and charge amplifier

  • US 4,418,335 A
  • Filed: 09/18/1981
  • Issued: 11/29/1983
  • Est. Priority Date: 10/06/1980
  • Status: Expired due to Fees
First Claim
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1. An infrared intrusion detector comprising:

  • a pyroelectric detector element;

    an evaluation circuit serving for giving an alarm signal in the event of a change in radiation of the detector element caused by a moving object;

    said evaluation circuit being operatively connected with said pyroelectric detector element;

    said evaluation circuit containing a charge amplifier;

    said detector element having an output;

    said charge amplifier having an input; and

    the input of the charge amplifier being connected with the output of the detector element.

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