| Summary: | Approved for public release; distribution is unlimited. === The normal displacement of a flexural disk sonar transducer's radiating face was measured using both a laser doppler vibrometer and surface mounted strain gages. The laser doppler vibrometer measurements were used to calibrate the strain gages, allowing a single measurement of strain to be used to define the displacement over the transducer's entire face. The feasibility of investigating the interaction of closely spaced array elements through the use of surface strain measurements was established by experiments with a submerged two element array. The surface strain, measured as a function of the transducer separation, increases the understanding of sonar transducer element interaction in a densely packed array.
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