厚壁管道周向压电Lamb波缺陷图像增强研究
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国家自然科学基金资助项目(51705232,51705231,51265044);江西省研究生创新专项基金项目资助(省级项目)(YC2016S337);声场声信息国家重点实验室开放课题研究基金资助项目(SKLA201806)

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Research on Defect Image Enhancement of Circumferential Piezoelectric Lamb Wave in ThickWalled Pipelines
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    摘要:

    为解决厚壁管道周向压电Lamb波缺陷检测中非平稳信号引起的低信噪比和分辨率问题,利用相位相干成像算法(PCI)从Lamb波信号中提取相位信息构建相位相干因子,通过动态加权处理放大相位分布对超声图像像素幅值的贡献。一方面,该方法保留相位分布一致的缺陷回波幅值,增强缺陷信噪比。另一方面,该方法能通过增强孔径波束指向性,提高后处理图像的虚拟聚焦效果及横向分辨力。通过对外径269 mm、壁厚32 mm的带有20 mm横向裂纹缺陷的厚壁管道进行了探伤检测,对得到的信号进行图像重建。结果表明,PCI的信噪比为25.2 dB,较原始B扫描图像提高了15.6 dB,半波高水平宽度由47.3 mm缩小到22.4 mm,提升了横向分辨率,提高了对缺陷的识别度。

    Abstract:

    To solve the problem of low signaltonoise ratio and resolution caused by the nonstationary signals in the defect detection of thickwalled pipelines with the circumferential piezoelectric Lamb waves, the phase coherence imaging algorithm (PCI) is used to extract the phase information from the Lamb wave signals to construct the phase coherence factor, and the dynamic weighting process is used to amplify the contribution of the phase distribution to the pixel amplitude of the ultrasound images. On the one hand, the method preserves the defect echo amplitude with the same phase distribution and enhances the signal to noise ratio. On the other hand, this method can improve the virtual focusing effect and lateral resolution of the postprocessed image by enhancing the directivity of the aperture beam. The flaw detection of a thickwalled pipeline with an outer diameter of 269 mm and wall thickness of 32 mm with a transverse crack of 20 mm has been carried out, and the obtained signals have been reconstructed. The results show that the signal to noise ratio of PCI is 25.2 dB, which is 15.6 dB higher than that of the original B scan images, and the halfwave high horizontal width is reduced from 47.3 mm to 22.4 mm, which improves the horizontal resolution and improves the recognition degree of defects.

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王立,陈果,石文泽,卢超,陈尧.厚壁管道周向压电Lamb波缺陷图像增强研究[J].压电与声光,2018,40(6):855-859. WANG Li, CHEN Guo, SHI Wenze, LU Chao, CHEN Yao. Research on Defect Image Enhancement of Circumferential Piezoelectric Lamb Wave in ThickWalled Pipelines[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2018-12-20
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