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Self-protecting infrared detector with a continuously variable attenuator

  • US 4,063,096 A
  • Filed: 01/03/1977
  • Issued: 12/13/1977
  • Est. Priority Date: 01/03/1977
  • Status: Expired due to Term
First Claim
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1. In an infrared detection system having an infrared detector and collecting optics, protection means for protecting said detector from high intensity radiation comprising:

  • a. a gas absorption cell disposed forwardly of said detector to limit the amount of radiation reaching said detector;

    b. gas storage means connected to said absorption cell to supply gas thereto;

    c. control means for controlling flow of gas to said cell in proportion to the intensity of radiation reaching said cell.

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