The design, operation and performance of a precision photoelectric pyrometer, which operates automatically under computer control, are described. Methods of determining the spectral characteristics, the size-of-source effect, the degree of polarization and the nonlinearity are described and results given. A table of uncertainties shows that the pyrometer has the capability of realizing the International Practical Temperature Scale of 1968 with uncertainties of 0.015 °C at 1064 °C and 0.210 °C at 2241 °C. However with the limitation caused by tungsten strip lamps these uncertainties become 0.025 °C at 1064 °C and 0.75 °C at 2241 °C.
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Jones et al. (1982) studied this question.
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