For ultrasonic transducers employed in deep seas, omnidirectivity is often required. In this paper, an omnidirectional transducer for use in deep seas is designed. To realize a transducer with desired directivity under high hydro-pressure, a new type of construction utilizes a high-sound-speed material called syntactic foam attached to a cylindrical transducer element. Numerically designed results for the omnidirectional transducer using finite element analysis considering an infinite space agree well with measured directivity patterns, and the design of a transducer with desired directivity for use under high hydro-pressure in deep seas is found to be possible.
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