hydrophone

n. instrument that determines direction and distance of sound underwater

A hydrophone is a submersible sound sensor. It is analogous to a microphone or an ear for listening to underwater sound. At its core is a piezoelectric material that generates electricity when subjected to a pressure change. Such piezoelectric materials, or transducers can convert a sound signal into an electrical signal since sound is a pressure wave in fluids. Some transducers can also serve as a projector (emitter), but not all have this capability, and may be destroyed if used in such a manner.
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hydrophone /'haidrəfoun/
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