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    • 5. 发明申请
    • ELECTROMAGNETIC ACOUSTIC TRANSDUCER WITH CROSS-TALK ELIMINATION
    • 具有交叉消除的电磁声学传感器
    • WO2009082524A3
    • 2010-10-21
    • PCT/US2008077890
    • 2008-09-26
    • BAKER HUGHES INCREIDERMAN ARCADYFORGANG STANISLAV W
    • REIDERMAN ARCADYFORGANG STANISLAV W
    • B06B1/04
    • G01N29/2412B06B1/04G01N29/32
    • The electromagnetic acoustic transducer (EMAT) transducer disclosed herein is useful for the non-destructive analysis of objects. The transducer comprises a core having a winding and a coil disposed between the core and the object to be analyzed. One transducer can be used as a transmitter and another transducer as a receiver. Then selectively switching static magnetic field in either transmitter or receiver and processing data with and without static magnetic Held allows for eliminating artifacts due to parasitic coupling between the transmitter/receiver pair. The switching of the static magnetic field can be implemented either by using electromagnet or a pair of permanent magnets where magnetization of one permanent magnet is reversed to provide cancellation of the static magnetic field.
    • 本文公开的电磁声换能器(EMAT)换能器对于物体的非破坏性分析是有用的。 换能器包括具有绕组和设置在芯和待分析对象之间的线圈的芯。 一个传感器可以用作发射器,另一个传感器可以用作接收器。 然后选择性地切换发射机或接收机中的静态磁场,以及使用和不使用静态磁场的处理数据。允许消除由于发射机/接收机对之间的寄生耦合引起的伪影。 静磁场的切换可以通过使用电磁体或一对永磁体来实现,其中一个永磁体的磁化反转以提供静磁场的抵消。