Magnetostrictive hybrid transducers

Abstract

The current need in many sonar systems is for a high-power broad-bandwidth projector with a relatively flat response. One of the prime candidates to accomplish this is a hybrid transducer that uses both a piezoelectric and magnetostrictive motor section connected mechanically in series in a tonpilz (longitudinal vibrator) configuration. This transducer has a double resonance separated by about one octave. The inherent shape of the transmit frequency responses dictate using the magnetostrictive section for the lower resonance, and the ceramic section for the upper resonance, including maintaining a high response for another octave. Attention to spurious structural resonances is important. A general overview of developing the device with attention to its design, high-power application, and problem areas will be presented. [Work supported by ONR.]