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Resolution enhancement of ultrasonic defect signals for crack sizing

机译：超声缺陷信号的分辨率增强，可用于裂纹定径

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摘要

A practical algorithm has been developed to increase the time resolution of an ultrasonic system for inspecting pipeline girth welds via deconvolution with autoregressive spectral extrapolation. The full-width-half-maximum of the analytic signal magnitude of experimental echo pulses was reduced by an average of 80% by this technique. There is also a reduction in the size of the dead zone at the weld root by close to 80%, in addition to a corresponding decrease in uncertainty of sizing estimates of cracks through crack-tip diffraction methods. The algorithm is used to inspect a test plate containing manufactured flaws with nominal depths ranging from 0.5 mm to 5 mm. Calculated values of crack depth were found to be consistent with destructive measurements of crack profiles.
机译：已经开发了一种实用的算法来提高超声系统的时间分辨率，该超声系统用于通过反卷积和自回归谱外推法检查管道环缝焊缝。通过这种技术，实验回波脉冲的分析信号幅度的全宽一半最大值平均减少了80％。除了通过裂纹尖端衍射方法确定的裂纹尺寸估计的不确定性相应减少之外，焊缝根部死区的大小也减少了近80％。该算法用于检查包含标称深度范围从0.5毫米到5毫米的制造缺陷的测试板。发现裂纹深度的计算值与裂纹轮廓的破坏性测量结果一致。

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  • 来源
    《NDT & E international》 |2012年第2012期|p.37-50|共14页
  • 作者

    B. Shakibi; F. Honarvar; M.D.C. Moles; J. Caldwell; Anthony N. Sinclair;

  • 作者单位

    Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, Canada M5S 3C8;

    Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, Canada M5S 3C8,NDE Lab, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, 17 Pardis St., Mollasadra Avenue, Vanak Sq., Tehran, Iran;

    Olympus NDT, 48 Woerd Avenue, Waltham, MA 02543, USA;

    Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, Canada M5S 3C8;

    Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, Canada M5S 3C8;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ultrasonics; signal processing; sizing; weldment; signal-to-noise ratio;

    机译：超声波信号处理;浆纱;焊件信噪比;

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