Analysis and design of a low frequency piston-like infra-sound transmitter

Summary form only given. A kind of ultra-low frequency piston-like sound source was analyzed and designed. The circular radiator on an infinite baffle plate was used as the acoustic model of the transducer. To get higher efficiency, sound wave was radiated from the source by the vibration of both sides of transmitter with corresponding radiation impedance. The relationship among frequency, radius and the vibrating amplitude of the radiator had been derived for different source levels. The infra-sound transmitter designed in this paper was proved to be powerful, and satisfied the demand of low-frequency sound propagation experiment in shallow water.