Two methods are outlined for determining the ultrasonic attenuation in thin rod-shaped specimens bonded to wire transmission lines. One method involves digital (video) pulses or short rf bursts resulting in separated echoes. The other employs rf bursts longer than three round trips in the specimen resulting in overlapped (stepped) echoes from the specimen. Use of three echo amplitudes or three interference steps permits the calculation of the reflection coefficient at the transmission line-specimen junction and the attenuation coefficient in the specimen. Methods for obtaining the travel time in the specimen are also outlined. Three experiments are reported to show the utility of the methods for studying specimens themselves and their environments.
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Emmanuel P. Papadakis (1971) studied this question.
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