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Conditions are investigated under which the integral six-colour pyrometer can be used below 1200 K to determine the true temperature T(0) of the surface of a material with unknown emissivity. In this case radiance temperature measurements are required above 1 micron wavelength. There is an upper limit of 2 microns, as above this wavelength the emissivity of oxides increases rapidly with the wavelength. In addition one needs a sufficient difference and spread of values so that the span of the independent variable for the determination of the temperature is larger than 1, with the wavelengths expressed in microns.

Additional information

Authors: BABELOT J-F, JRC Karlsruhe (DE);HOCH M, University of Cincinnati, Dept. of Materials Science and Engineering (US)
Bibliographic Reference: Paper presented: 4th International Symposium on Temperature and Thermal Measurement in Industry and Science TEMPMEKO 90, Helsinki (FI), September 17-19, 1990
Availability: Available from (1) as Paper EN 35546 ORA
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