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Infra-red optical systems

  • US 4,583,814 A
  • Filed: 07/13/1984
  • Issued: 04/22/1986
  • Est. Priority Date: 07/20/1983
  • Status: Expired due to Fees
First Claim
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1. An infra-red optical system including optical means for imaging a field of view onto a thermal sensor, the perimeter of the field of view being defined by an aperture stop located within the system and at least part of which is within said field of view;

  • and means for controlling the temperature of the aperture stop in dependence on the temperature of the field of view.

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