| 摘要 |
An electro-dynamic acoustic projector provides a rigid enclosure having an open end. A pressure compensated chamber extends into the rigid enclosure from the open end. A vibratile piston is located in the open end of the rigid enclosure and closed the pressure compensated chamber. The vibratile piston has an axis of oscillation perpendicular to the plane of the open end and an anterior major surface exposed from the open end for generating sound waves in water. A magnet assembly is attached to the vibratile piston which interacts with a stator coil positioned with respect the rigid enclosure and vibratile piston. The magnet assembly is affixed to a posterior surface of the vibratile piston. The magnet assembly comprises first and second permanent magnets located with respect to one another to bring like poles into facing opposition. The facing like poles are separated from one another by a ferromagnetic focus element.
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