ULTRASONIC COUPLING LOSSES
PENNSYLVANIA STATE UNIV STATE COLLEGE ORDNANCE RESEARCH LAB
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Coupling losses must be considered in ultrasonic measurements of small specimens of high Q materials. In these measurements, the energy loss in the bonding material is often of the same magnitude or larger than the loss in the specimen. This study is an investigation of the characteristics of coupling losses. The energy losses due to a coupling film or coupling by placing surfaces in optical contact were measured as a function of such varied parameters as frequency, bond thickness, bond composition, mechanical loading, surface conditions, relative alignment of transducer and specimen, and temperature.
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