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    Method and apparatus for eddy current flaw detection utilizing a detector with a positive and two negative feedback loops
    5.
    发明授权
    Method and apparatus for eddy current flaw detection utilizing a detector with a positive and two negative feedback loops 失效
    用于电流检测的方法和装置利用具有正负两个反馈反馈的检测器

    公开(公告)号：US3688186A

    公开(公告)日：1972-08-29

    申请号：US3688186D

    申请日：1970-11-18

    Applicant: REPUBLIC STEEL CORP

    Inventor： JUDD TYLER W

    IPC: G01N27/90 ,  G11B20/18 ,  G01R33/12

    CPC classification number: G11B20/18 ,  G01N27/9046

    Abstract: An eddy current flaw detector, and method of operation thereof, for detecting defects in metallic workpieces. The flaw detector includes an oscillator circuit having an operational amplifier, a negative feedback circuit coupled between the output terminal and an inverting input terminal of the amplifier, and a positive feedback circuit coupled between the output terminal and a noninverting input terminal of the amplifier. Also, a search probe is electrically coupled to the non-inverting input terminal of the operational amplifier to form a portion of the positive feedback circuit thereby providing a flaw detector with improved operational stability.

    Abstract translation: 涡流探伤仪及其操作方法，用于检测金属工件中的缺陷。 所述探伤器包括具有运算放大器的振荡器电路，耦合在所述放大器的输出端子和反相输入端子之间的负反馈电路，以及耦合在所述放大器的输出端子和非反相输入端子之间的正反馈电路 。 此外，搜索探针电耦合到运算放大器的非反相输入端，以形成正反馈电路的一部分，从而提供具有改进的操作稳定性的探伤仪。

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