Differential Path Method for Measuring Ultrasonic Velocities in Glasses at High Temperatures

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Abstract
A method is described for measuring longitudinal and shear mode velocities in glasses over a wide temperature range at frequencies in the 10–20 Mc range. Use is made of a differential path technique in which measurements are made on a heated portion of a short rod-form sample. Transducer and bond are kept outside the furnace and thus are kept at normal operating temperatures. Also described is a pulsed oscillator unique to the method of measurement and responsible for the high degree of resolution and accuracy. Data for a commercial glass showing large changes in unit delay time as temperatures approach the softening point of the glass are illustrative of the method described.

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