Great depth, high efficiency, broadband, reliable low frequency transducer for acoustical oceanography

摘要

Acoustical oceanography and particularly acoustic tomography (measurement of the dynamic behaviour of the ocean) has needs for low frequency, high efficiency, broadband and great depth transducers. The double-ended longitudinal Janus-Helmholtz projector designed by DCN Ingenierie Sud for active sonar widely fulfils these requirements. This article describes the frequency and depth capability optimization of this transducer. Free-flooded projectors with a first resonance below 300 Hz have then been modelled, achieved and measured.