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2. Underwater acoustic positioning system - Wikipedia

   en.wikipedia.org/wiki/Underwater_acoustic...

   Accuracy depends on transducer spacing and mounting method. When a wider spacing is employed as when working from a large working barge or when operating from a dock or other fixed platform, the performance can be similar to LBL systems. When operating from a small boat where transducer spacing is tight, accuracy is reduced.

3. Dynamic positioning - Wikipedia

   en.wikipedia.org/wiki/Dynamic_positioning

   This system consists of one or more transponders placed on the seabed and a transducer placed in the ship's hull. The transducer sends an acoustic signal (by means of piezoelectric elements) to the transponder, which is triggered to reply. As the velocity of sound through water is known (preferably a soundprofile is taken regularly), the ...

4. Electromagnetic acoustic transducer - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_acoustic...

   An electromagnetic acoustic transducer (EMAT) is a transducer for non-contact acoustic wave generation and reception in conducting materials. Its effect is based on electromagnetic mechanisms, which do not need direct coupling with the surface of the material.

5. Moving magnet actuator - Wikipedia

   en.wikipedia.org/wiki/Moving_magnet_actuator

   It typically consists of an arrangement of a mobile permanent magnet and fixed coil, arranged so that currents in the coil generate a pair of equal and opposite forces between the coil and magnet. A voice coil actuator , also called a voice coil motor (VCM), is an electromagnetic linear actuator where the magnet is fixed and the coil is mobile.

6. Sonar - Wikipedia

   en.wikipedia.org/wiki/Sonar

   Other types of transducers include variable-reluctance (or moving-armature, or electromagnetic) transducers, where magnetic force acts on the surfaces of gaps, and moving coil (or electrodynamic) transducers, similar to conventional speakers; the latter are used in underwater sound calibration, due to their very low resonance frequencies and ...

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