A Technique of Measuring the Transparency of Materials as a Function of Temperature

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Abstract
A simple technique has been developed to measure the transparency of materials at any specific wavelength (ultraviolet to near infrared) vs temperature. The procedure involves heating a sample between calcium fluoride plates in a brass holder placed in a Cary 14 spectrophotometer. Changes in transmittance at a fixed wavelength are recorded continuously as the temperature is allowed to change slowly. As an illustration of the procedure the transmission properties of the nematic liquid crystal, butyl p‐(p‐ethoxyphenoxycarbonyl)‐phenyl carbonate, in its various states are described. For comparison purposes a description of the transmittance of phenyl benzoate (which does not possess a mesophase) is also included.

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