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Pyro-electric type infrared detector

  • US 5,281,818 A
  • Filed: 06/10/1991
  • Issued: 01/25/1994
  • Est. Priority Date: 06/11/1990
  • Status: Expired due to Fees
First Claim
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1. An infrared detecting apparatus comprising:

  • an array sensor having an array of pyro-electric type infrared detectors arranged in one direction;

    a lens for collecting incident infrared rays on said array sensor;

    a driving means for rotating said lens around said array sensor about a rotation axis parallel to the direction of arrangement of said infrared detectors to scan said incident infrared rays in a direction of rotation about said rotation axis;

    a standard temperature material arranged adjacent to said lens in a part of view scanned by said lens, said standard temperature material being divided into a plurality of portions which are periodically arranged in the scanning direction; and

    a signal processor coupled to said sensor array for measuring a temperature of an object by comparing an output from said sensor array when receiving infrared rays from said object with an output from said sensor array when receiving infrared rays from said standard temperature material,wherein said array sensor and said lens are arranged to satisfy the following condition;

    ##EQU3## where, a is an effective diameter of said lens in the scanning direction, f is a focal length of said lens, w is an effective width of said array sensor in the scanning direction, and θ

    is an angle formed between an utmost end of a measuring area and a center of the measuring area.

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