Patent ID: 6379038
Filing Date: 2002-04-30
Classification: G01J

Abstract:
A process for measuring the temperature of a radiating body, comprising:a) quantifying the radiation intensity emitted by a radiating body at no less than 4 distinct wavelengths; b) generating a mathematical function which represents said quantified radiation intensities at the corresponding wavelength at which said radiation intensity was quantified; c) selecting no less than two specific wavelengths; d) generating a spectral intensity using said mathematical function for each of said wavelengths; e) generating an individual two-wavelength temperature value of said radiating body utilizing the radiation equation T12=Câ€²&af;(1/Î»1-1/Î»2)ln&it;â€ƒ&it;R-5&it;â€ƒ&it;ln&af;(Î»2/Î»1)â€ƒwhere T12=individual two-wavelength temperature, &lgr;1,&lgr;2, . . . &lgr;n=specific wavelengths selected, Câ€²=second radiation constant, and R=ratio of the generated spectral intensity I1, calculated using said mathematical function at &lgr;1, to the generated spectral intensity I2, calculated using said mathematical function at &lgr;2; f) analyzing said individual two-wavelength temperatures for consensus or lack of consensus; g) if there is consensus, reporting the temperature and ending the process; h) if there is no consensus, analyzing said individual two-wavelength temperatures for spectrally varying emissivity; i) calculating the functional dependence of emissivity on wavelength for said radiating body from said two-wavelength temperatures; j) calculating new individual two-wavelength temperatures using said functional dependence of emissivity on wavelength; and k) reporting the average of said new individual two-wavelength temperatures.