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Title: Emissivity independent optical pyrometer

Disclosed herein are representative embodiments of methods, apparatus, and systems for determining the temperature of an object using an optical pyrometer. Certain embodiments of the disclosed technology allow for making optical temperature measurements that are independent of the surface emissivity of the object being sensed. In one of the exemplary embodiments disclosed herein, a plurality of spectral radiance measurements at a plurality of wavelengths is received from a surface of an object being measured. The plurality of the spectral radiance measurements is fit to a scaled version of a black body curve, the fitting comprising determining a temperature of the scaled version of the black body curve. The temperature is then output. The present disclosure is not to be construed as limiting and is instead directed toward all novel and nonobvious features and aspects of the various disclosed embodiments, alone or in various combinations and subcombinations with one another.
Issue Date:
OSTI Identifier:
UT-Battelle, LLC ORNL
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2013 Nov 05
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
Country of Publication:
United States

Other works cited in this record:

Tool Surface Temperature Measuring Apparatus
patent, May 1971

Emissivity Corrected Optical Pyrometer
patent, October 1972

Fiber optical temperature measurement devices
patent, February 1982

Temperature determining device and process
patent, June 1998

Multi-wavelength imaging pyrometer
patent, October 1998

Temperature determining device and process
patent, April 2002

Temperature determination using pyrometry
patent, June 2002

Strategy and enhanced temperature determination in a laser heated diamond anvil cell
journal, May 2009
  • Deemyad, Shanti; Papathanassiou, Anthony N.; Silvera, Isaac F.
  • Journal of Applied Physics, Vol. 105, Issue 9, Article No. 093543
  • DOI: 10.1063/1.3117517

Automatic compensation of emissivity in three-wavelength pyrometers
journal, July 2007

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