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    • 9. 发明授权
    • Method and apparatus for evaluating length of defect in eddy current testing
    • 用于评估涡流测试中缺陷长度的方法和装置
    • US07911206B2
    • 2011-03-22
    • US11771436
    • 2007-06-29
    • Akira NishimizuYoshio NonakaIsao YoshidaMotoyuki NakamuraAkihiro TakiMasahiro Koike
    • Akira NishimizuYoshio NonakaIsao YoshidaMotoyuki NakamuraAkihiro TakiMasahiro Koike
    • G01N27/82G01N27/72
    • G01N27/9046
    • The surface length of a metal subject to be inspected is evaluated by detecting an eddy current without using a combination of a scale and visual or liquid penetrant inspection. An exciting coil and a detecting coil are scanned above the subject in a length direction. An eddy current detector measures an output voltage corresponding to scanning positions based on an output from the detecting coil. Based on an output voltage distribution curve indicating a distribution of output voltages corresponding to the scanning positions, position information is extracted corresponding to values which are within a differential voltage range and lower by 12 dB than a maximum value of the output voltages on the left and right sides of the distribution. A distance between the positions included in the extracted information is calculated to evaluate the length of a slit which is a defect present on the subject surface.
    • 要检查的金属的表面长度通过检测涡流来评估,而不使用水垢和视觉或液体渗透剂检查的组合。 激光线圈和检测线圈在长度方向上扫描被检体的上方。 涡电流检测器基于来自检测线圈的输出来测量对应于扫描位置的输出电压。 基于表示与扫描位置对应的输出电压分布的输出电压分布曲线,对应于在差分电压范围内并且比左侧的输出电压的最大值低12dB的值提取位置信息, 右侧分配。 计算提取的信息中包含的位置之间的距离,以评估作为被摄体表面上存在的缺陷的狭缝的长度。