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Self-calibrated active pyrometer for furnace temperature measurements

  • US 5,785,426 A
  • Filed: 10/06/1995
  • Issued: 07/28/1998
  • Est. Priority Date: 01/14/1994
  • Status: Expired due to Fees
First Claim
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1. Pyrometer for temperature measurement comprising:

  • a heterodyne millimeter/sub-millimeter-wave or microwave receiver, the receiver adapted to receive radiation from a surface whose temperature is to be measured, wherein a path of the radiation received by the receiver is a field-of-view of the pyrometer;

    a millimeter/sub-millimeter-wave or microwave probe beam source, which emits a probe beam which is reflected from the surface into the receiver; and

    apparatus for mapping out interference patterns associated with the probe beam source and obtaining peak values therefor for emissivity calculation,wherein the radiation from the surface includes a surface emission portion and a surface reflection portion including the reflected probe beam, the surface emission portion being related to the surface temperature and the surface reflection portion being related to the emissivity of the surface.

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