Presented at the International Workshop – for Radiation Measurements of Bodies with Unknown Emissivities at the ElectroTechno Exposition, Moscow, RUSSIA, Nov. 2 – 4, 2003

Expert System Spectropyrometer Results for non-black, non-grey, or Changing Emissivity and Selectively Absorbing Environments

Ralph A. Felice

FAR Associates, Macedonia, Ohio, USA

Abstract. An expert-system multi-wavelength pyrometer based on a grating spectrophotometer has been able to overcome many well-known difficulties of pyrometry. These include unknown, changing, and/or spectral dependence of emissivity as well as environmental absorption of radiation. In addition to a spectrophotometer and the usual optics, the instrument includes a computer which analyzes each measurement and then returns the temperature, the tolerance (a real-time measure of accuracy), and the signal strength (a quantity directly related to the emissivity at a chosen wavelength). The instrument can save the input data, the thermal spectrum, for each temperature measurement. Accuracy to 0.10% is routinely achieved.