Multiwavelength pyrometer for gray and non-gray surfaces in the

Details Multiwavelength pyrometer for gray and non-gray surfaces in the Multiwavelength pyrometer for gray and non-gray surfaces in the

1992-12-14

1994-07-05

Gutierrez, Diego F. F.

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

374128, 374129, 374 9, 364557, 2503381, G01J 562, G01J 552, G01J 500

Patent

active

053261720

ABSTRACT:
A method and apparatus for detecting the temperature of gray and non-gray bodies in the presence of interfering radiation. A gray body has a constant emissivity less than 1 and a non-gray body has an emissivity which varies with wavelength. The emissivity and reflectivity of the surface is determined over a range of wavelengths. Spectra are also measured of the extraneous interference radiation source and the surface of the object to be measured in the presence of the extraneous interference radiation source. An auxiliary radiation source is used to determine the reflectivity of the surface and also the emissivity. The measured spectrum of the surfaces in the presence of the extraneous interference radiation source is set equal to the emissivity of the surface multiplied by a Planck function containing a temperature term T plus the surface reflectivity multiplied by the spectrum of the extraneous interference radiation source. The equation is then solved for T to determine the temperature of the surface.

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Hunter et al.; "Multiwavelength Pyrometry-An Improved Method," Optical Engineering, vol. 24, No. 6 (Nov.-Dec. 1985), pp. 1081-1085.

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