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Continuous optical path monitoring of optical flame and radiation detectors

  • US 5,914,489 A
  • Filed: 07/24/1997
  • Issued: 06/22/1999
  • Est. Priority Date: 07/24/1997
  • Status: Expired due to Term
First Claim
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1. An optical radiation detection apparatus, comprising:

  • a housing with one or more optical windows having one or more external surfaces;

    one or more optical radiation detectors disposed within the housing behind the one or more optical windows, said one or more optical detectors responsive to incoming radiation passing through the one or more optical windows to generate detector signals;

    one or more optically transmissive rods mounted into the housing adjacent to the one or more optical windows, said one or more optical rods having a reflective bevel at an external extremity outside the housing; and

    light source apparatus positioned relative to the one or more optical rods to cause test light from the light source apparatus to transmit through the one or more optical rods and reflect off the reflective bevel onto the one or more external surfaces of the one or more optical windows, and to pass through the one or more optical windows onto the one or more radiation detectors, wherein said test light passes through the same one or more optical windows through which said incoming light energy passes.

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