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CALIBRATION TECHNIQUE AND APPARATUS

  • US 3,765,779 A
  • Filed: 06/27/1972
  • Issued: 10/16/1973
  • Est. Priority Date: 06/27/1972
  • Status: Expired due to Term
First Claim
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1. A method for determining the absolute radiance of a low energy source with a radiometer having a target optical system, a reference optical system, a modulator and a detector comprising directing the target and reference optical systems at a cold target, varying to predetermined values the reflectivity and emissivity of a reflector exclusively utilized in the target optical system to provide energy level outputs from the radiometer detector corresponding to the various values of emissivity at ambient temperature, directing the target optical system at an infrared target of interest while simultaneously directing the reference optical system at a cold target, comparing the output from the detector of said radiometer when said target optical system is directed at an infrared target of interest with the outputs corresponding to said various values of emissivity to determine the absolute radiance of the target of interest.

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