Abstract
Interest in the anharmonic properties of solids has resulted in the development of instruments capable of resolving extremely small changes in the velocity of ultrasonic waves (∼1 part in 107). A “sing-around” system, initially designed for use in studies of the third-order elastic constants of solids, has been developed from the system described by Forgacs [IRE Trans. on Instr. 9, 359 (1960)]. The new apparatus appears to overcome the main limitation of the Forgacs system (viz., its sensitivity to the amplitude of the acoustic signal) by using a zero crossing discriminator to convert the acoustic signal, which consists of a series of echoes, into a number of constant amplitude pulses. The instrument has been used to examine stress-induced velocity changes in some 3–5 semiconductors, especially indium antimonide, and there is some evidence of curvature in the functional relation between transit time and stress at low stress levels.
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