Abstract
Some of the recent developments of underwater acoustic transducers in China, such as the Rare-Earth giant magnetostrictive (Terfenol-D underwater acoustic transducers (including 1-kHz free-flooded modified IV flextensional transducer, the 890-Hz free-flooded Terfenol-D hexagonal transducer, and the 2.7-kHz Tonpilz Terfenol-D transducer), the 500-Hz flexible disk piezoelectric high-power transducer, the 450-kHz 2-2 piezoelectric composite underwater acoustic transmitting transducer, the 1-3 piezoelectric composite hydrophone, the 100–10<th>000-kHz polar glass ceramic hydrophone, the small-size low-frequency narrow beam hydrophone, the acoustic pressure receiver-vibration pick-up compound hydrophone, the large area PVDF hydrophone, etc., are presented in this paper.
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