For ultrasonic transducers employed in deep seas, omnidirectivity is often required. To get an omnidirectional transducer, we devised a new transducer structure in which a syntactic buoyancy material is attached to the inside or the outside of a cylindrical transducer element. The buoyancy material, known as syntactic foam, can resist the high static pressure of deep seas, and its sound velocity is higher than that of the water. We experimentally investigate the geometrical arrangement and shape of syntactic foam to obtain the omnidirectional transducer. Consequently, it is found that some of these transducers have nearly equal sensitivity in all directions.
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