Abstract

It is shown by calculations based on spectral transmission data that Chance ON30 neutral and Corning Pyrometer Brown glasses may be used as constant-absorption absorbing filters in optical pyrometry to measure indefinitely high-luminance temperatures with calculable accuracy. In the case of Chance ON30 glass below 2500°K, the constant absorption was confirmed by direct calibration using a rotating sectored disk.

Corrections have been calculated to 8000°K, to change from temperatures based on Wien’s law to temperatures based on Planck’s law. A number of minor precautions necessary to achieve the greatest possible accuracy have been noted and standard-deviation accuracies have been calculated for high temperatures.

The theory of optical pyrometry has been developed, in an appendix, in a form suitable for discussion of high-temperature measurements.

© 1960 Optical Society of America

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