Resolution Enhancement in Ultrasonic TOFD Imaging by Combining Sparse Deconvolution and Synthetic Aperture Focusing Technique (Sparse-SAFT)
Resolution Enhancement in Ultrasonic TOFD Imaging by Combining Sparse Deconvolution and Synthetic Aperture Focusing Technique (Sparse-SAFT)
复制标题
结合稀疏反卷积和合成孔径聚焦技术 (Sparse-SAFT) 增强超声 TOFD 成像分辨率
DOI：
10.1186/s10033-022-00768-3
复制
发表时间：
2022-07
影响因子：
4.2
通讯作者：
Jin Shijie
中科院分区：
文献类型：
--
作者：
Sun Xu;Lin Li;Jin Shijie
摘要 由于脉冲宽度和波束扩展引起的低分辨率，超声飞行时间衍射（TOFD）难以识别和量化浅层次表面缺陷。本文提出稀疏SAFT，通过结合稀疏反卷积和合成孔径聚焦技术（SAFT）来提高TOFD成像的时间分辨率和横向分辨率。基于l 1 和l 2 范数约束建立频域数学模型，并解决优化问题以提高时间分辨率。在此基础上，采用SAFT通过延迟求和波束形成来提高横向分辨率。仿真和实验结果表明，Sparse-SAFT可以解耦横波和尖端衍射波。对深度3.0mm处高度为3.0mm的浅表下缺陷进行定量检测，缺陷高度和深度的相对测量误差不大于10.3%。与传统SAFT相比，Sparse-SAFT的时间分辨率和横向分辨率分别提高了72.5%和56%。最后，所提出的方法还适用于提高分辨率以检测死区之外的缺陷。
Abstract The shallow subsurface defects are difficult to be identified and quantified by ultrasonic time-of-flight diffraction (TOFD) due to the low resolution induced by pulse width and beam spreading. In this paper, Sparse-SAFT is proposed to improve the time resolution and lateral resolution in TOFD imaging by combining sparse deconvolution and synthetic aperture focusing technique (SAFT). The mathematical model in the frequency domain is established based on the l 1 and l 2 norm constraints, and the optimization problem is solved for enhancing time resolution. On this basis, SAFT is employed to improve lateral resolution by delay-and-sum beamforming. The simulated and experimental results indicate that the lateral wave and tip-diffracted waves can be decoupled with Sparse-SAFT. The shallow subsurface defects with a height of 3.0 mm at the depth of 3.0 mm were detected quantitatively, and the relative measurement errors of flaw heights and depths were no more than 10.3%. Compared to conventional SAFT, the time resolution and lateral resolution are enhanced by 72.5 and 56% with Sparse-SAFT, respectively. Finally, the proposed method is also suitable for improving resolution to detect the defects beyond dead zone.
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DOI：
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期刊：
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