The Effect of Temperature Upon the Infra-Red Absorption of Certain Glasses

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Abstract
Change of the infra-red transmission of glass with rise of temperature.—Dr. K. S. Gibson has studied the effect of temperature rise upon the absorption spectra of certain glasses in the visible region. He found a shift toward the longer wave-lengths and a decrease in transmission. The infra-red transmission (0.6 μ to 4.0 μ) of the same specimens has been studied at 80° C., 307° C. and 440° C. Rise of temperature increases the transmission in the region of an absorption band. There is a shift of the transmission bands toward the longer wave-lengths. The same results are obtained whether one observes a series of ascending or a series of descending temperatures.