Abstract

A furnace attachment was designed for the Perkin-Elmer Model 21 infrared spectrophotometer to investigate the effects of high temperature on the transmittance of infrared transmitting glasses and other optical materials. The problem of interfering radiation from the sample and furnace is resolved by taking four readings on the instrument from which the true transmittance can be computed.

Results are given for a number of glasses at temperatures from 25° to 600°C. The changes in transmittance are relatively small over the range of temperatures studied. At the shorter wavelengths, below 2 μ where the absorptivity of most glasses is negligible, the change is not measurable.

© 1959 Optical Society of America

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