结果表明:该方法提取的缺陷回波信号特征值,其可分性测度均值达91.7%,从而证明该方法对超声检测缺陷回波信号的特征提取是相当有效的。
The average value of separability measure is as high as 91.7%, which indicates that this method is quite effective in the feature extraction of ultrasonic flaw echoes.
本文以无缺陷时的表面回波为参考信号,用信号处理方法,识别表面缺陷回波,从而实现对表面缺陷的检测。文中给出了该方法的原理及实验结果。
Detection of surface-breaking cracks has been realized by signal processing method using the reference signal from a surface without flaws. The principle and experimental results are given.
提出了基于高阶谱的减噪方法,能有效提高回波信号的信噪比,减弱检测噪声对于缺陷散射特征的影响,从而突出缺陷特征信息。
A method for reducing noise based on high-order spectra was presented by which the signal-to-noise ratio (SNR) could be improved significantly and the flaw characteristic information could stand out.
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