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Correlation thermography

  • US 4,416,552 A
  • Filed: 10/15/1981
  • Issued: 11/22/1983
  • Est. Priority Date: 10/15/1981
  • Status: Expired due to Fees
First Claim
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1. A passive remote thermal radiation sensing and processing system for non-invasive temperature measurement of the interior of a body, said system comprising:

  • at least first and second directional receiving means for receiving thermally-generated energy from inside said body and generating corresponding electrical signals, each of said first and second directional receiving means having a defined directional receiving pattern and said first and second directional receiving means being adapted to be coupled with the surface of said body at different locations about said body so that their directional receiving patterns intersect;

    multiplier means connected to receive the electrical signals generated by said first and second directional receiving means for producing a product output signal proportional to the product of said electrical signals; and

    averaging means connected to said multiplier means for averaging said product output signal over a period of time to generate a correlation output signal which is a measure of the thermally-generated energy within the volume of intersection of the directional receiving patterns of said first and second directional receiving means.

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