Abstract
An in-air measurement procedure has been developed to measure the displacement of a vibrating surface. Specifically the amplitude of vibration has been measured for the radiating surfaces of several transducers (primarily tonpilz type) of different designs. The objective being to determine to what degree the radiating head of a transducer acts as a rigid piston at resonance. In some cases it was known prior to measurement that the radiating head was vibrating with a modal structure, i.e., the corners vibrated out of phase with the center. A fiber optic measurement system was used in order to perform noncontact vibration displacement measurements. The usable frequency range is dc to 100 kHz. Displacement amplitudes on the order of one micron have been measured accurately. The apparatus, which was built at the Applied Research Laboratory at The Pennyslvania State University, allows displacement mapping of the entire surface of a transducer's radiating head. [Work supported by NAVSEA.]
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