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    • 4. 发明授权
    • Electromagnetic acoustic transducer
    • 电磁换能器
    • US4434663A
    • 1984-03-06
    • US338776
    • 1982-01-11
    • William E. PetersonRobert B. Thompson
    • William E. PetersonRobert B. Thompson
    • B06B1/04G01N29/24G01N29/04
    • B06B1/04G01N29/2412G01N2291/0422
    • Disclosed is an electromagnetic acoustic transducer for use with electrically conductive objects. The transducer includes an electromagnet for establishing a static magnetic field directed into the object in a first region and directed out of the object in a second region. A meander coil for inducing eddy currents in the object when an alternating current is applied to the coil includes a first serpentine printed circuit on a first side of a printed circuit board and a second serpentine printed circuit on a second side of the board. The source and the coil are so oriented that the vector product of the field and the eddy currents produces an instantaneous force field in the object which is periodically alternately oriented.
    • 公开了一种用于导电物体的电磁声换能器。 换能器包括电磁体,用于在第一区域中建立指向物体的静磁场,并在第二区域中引导出物体。 当向线圈施加交流电流时,用于在物体中感应涡流的曲折线圈包括在印刷电路板的第一侧上的第一蛇形印刷电路和位于板的第二侧上的第二蛇形印刷电路。 源极和线圈如此取向,使得场和矢量的矢量产生在物体中产生周期性地交替取向的瞬时力场。