Digitally controlled multifrequency eddy current test apparatus and
method
    1.
    发明授权
    Digitally controlled multifrequency eddy current test apparatus and method 失效
    数控多频涡流试验装置及方法

    公开(公告)号:US4303885A

    公开(公告)日:1981-12-01

    申请号:US49192

    申请日:1979-06-18

    IPC分类号: G01N27/90 G01R33/12 G01N27/82

    CPC分类号: G01N27/9046

    摘要: Digitally controlled eddy current test apparatus for detecting flaws, their extent and location. The apparatus provides absolute and differential measurements. The apparatus employs multi-frequencies with the signals from the test coils mixed in a predetermined manner to reduce unwanted signals such as may be introduced by wobble (lift-off) and support plates.

    摘要翻译: 用于检测缺陷的数字控制涡流测试装置,其范围和位置。 该设备提供绝对和差分测量。 该装置采用多频,其中来自测试线圈的信号以预定方式混合,以减少诸如可能通过摆动(剥离)和支撑板引入的不期望的信号。

    Multi frequency eddy current test apparatus with intermediate frequency
processing
    3.
    发明授权
    Multi frequency eddy current test apparatus with intermediate frequency processing 失效
    具有中频处理的多频涡流测试装置

    公开(公告)号:US4467281A

    公开(公告)日:1984-08-21

    申请号:US125895

    申请日:1980-02-29

    IPC分类号: G01N27/90 G01N27/72 G01R33/12

    CPC分类号: G01N27/9053 G01N27/9046

    摘要: An eddy current test apparatus and method in which multiple sequential test frequencies are employed. The voltage induced in a sensing coil at said test frequencies are multiplexed and frequency translated to provide a single frequency for processing. The apparatus employs a single channel to process the induced voltages.

    摘要翻译: 一种使用多个顺序测试频率的涡流测试装置和方法。 在所述测试频率下在感测线圈中感应的电压被多路复用并频率转换以提供用于处理的单个频率。 该装置采用单通道来处理感应电压。