VERFAHREN UND VORRICHTUNG ZUM DETEKTIEREN VON OBERFLÄCHENNAHEN DEFEKTEN MITTELS STREUFLUSSMESSUNG
    3.
    发明公开
    VERFAHREN UND VORRICHTUNG ZUM DETEKTIEREN VON OBERFLÄCHENNAHEN DEFEKTEN MITTELS STREUFLUSSMESSUNG 有权
    方法和设备表面缺陷附近进行探测通过散布流量测量

    公开(公告)号:EP2269049A1

    公开(公告)日:2011-01-05

    申请号:EP09732339.8

    申请日:2009-03-25

    发明人: BRAUN, Heinrich

    IPC分类号: G01N27/87

    CPC分类号: G01N27/87

    摘要: The invention relates to a method and a device for detecting near-surface defects (152) in a sample (150) made at least partially of ferromagnetic material, wherein a test volume of the sample is magnetized and scanned for magnetic flux leakages (155) caused by defects. The test volume is magnetized by means of a constant magnetic field (135), and simultaneously by means of an alternating magnetic field (145) superposed on the constant field.