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    • 9. 发明授权
    • S/N ratio measuring method in eddy current testing on internal surface of pipe or tube
    • 管/内管涡流检测中的S / N比测量方法
    • US08027796B2
    • 2011-09-27
    • US12084380
    • 2006-10-27
    • Shoji KinomuraYoshiyuki NakaoToshiya KodaiShugo Nishiyama
    • Shoji KinomuraYoshiyuki NakaoToshiya KodaiShugo Nishiyama
    • G01R29/26
    • G01N27/9046
    • A method in accordance with the present invention includes the steps of: separating an eddy current signal into an X-axis component and a Y-axis component to obtain signal waveform data of the respective components; excluding predetermined low-frequency components respectively from the respective signal waveform data thus obtained; calculating a noise voltage value V1 defined by the following Equation (1) based upon voltage values X(i) and Y(i) of the signal waveform data of the X-axis component and the Y-axis component from which the low-frequency components have been excluded; and calculating an S/N ratio by dividing a voltage value D of an eddy current signal corresponding to a predetermined artificial flaw by the noise voltage value V1: V ⁢ ⁢ 1 = π / n · ∑ i = 1 n ⁢ ( X ⁡ ( i ) 2 + Y ⁡ ( i ) 2 ) 1 / 2 ( 1 ) where n represents the number of samplings of the signal waveform data.
    • 根据本发明的方法包括以下步骤:将涡流信号分离成X轴分量和Y轴分量,以获得各个分量的信号波形数据; 从这样获得的各个信号波形数据中分别排除预定的低频分量; 基于X轴分量和Y轴分量的信号波形数据的电压值X(i)和Y(i),计算由下式(1)定义的噪声电压值V1,其中低频 组件已被排除; 并且通过将对应于预定人造缺陷的涡流信号的电压值D除以噪声电压值V1来计算S / N比:V ud 1 =&pgr; / n·Σi = 1 n(X⁡(i)2 + Y⁡(i)2)1/2(1)其中n表示信号波形数据的采样次数。