A 300 Hz Janus-Helmholtz transducer for ocean acoustic tomography

Ocean acoustic tomography has need for low frequency and high efficiency transducers, in order to reach ranges greater than 500 km with large bandwidth and great depth capability. The characteristics of the Janus-Helmholtz transducer, designed by DCN Ingenierie Sud, widely answer these contradictory requirements. However, as acoustic tomography requires lower frequencies (a working frequency band around 400 Hz is expected), several Janus-Helmholtz transducers with a lower first resonance frequency have been modelled with the finite-element code ATILA. In addition, for other applications, a larger projector with a first resonance frequency at 160 Hz has been defined. Some new insights of the transducer response interpretation are also given.<
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