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首页> 外文期刊>Journal of Nondestructive Evaluation >A Fast Interface Reconstruction Method for Frequency-Domain Synthetic Aperture Focusing Technique Imaging of Two-Layered Systems with Non-planar Interface Based on Virtual Points Measuring
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A Fast Interface Reconstruction Method for Frequency-Domain Synthetic Aperture Focusing Technique Imaging of Two-Layered Systems with Non-planar Interface Based on Virtual Points Measuring

机译：基于虚拟点测量的非平面界面的两层系统频域合成孔径对焦技术成像的快速接口重构方法

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摘要

Frequency-domain synthetic aperture focusing technique (SAFT), such as non-stationary phase shift migration (NSPSM), plays an essential role in the ultrasonic imaging of two-layered systems with non-planar interfaces. However, with NSPSM fast imaging under blind test conditions is hard to realize due to a lack of interface information in practice. To overcome this difficulty, a fast interface reconstruction method for NSPSM imaging of non-planar two-layered systems is proposed based on virtual points measuring. In blind testing conditions, a series of virtual points (VP) were created at the non-planar interface of the two-layered system by the time-of-flight (TOF) of the first incoming echo. Then, the interface for the two-layered system was quickly established by the interpolation of the VP. Finally, the NSPSM imaging for the two-layered system with non-planar interfaces was realized by the borderline which is used to distinguish the velocities of the coupling medium and tested part in the same extrapolating depth. The imaging results showed that the position of side-drilled holes was located correctly and the efficiency of the algorithm was significantly improved. Hence, the VP-NSPSM method is expected to achieve fast or even real-time imaging of two-layered systems with non-planar interfaces in practical NDT applications.
机译：频域合成孔径聚焦技术（SAFT），例如非静止相移迁移（NSPSM），在具有非平面界面的两层系统的超声波成像中起重要作用。然而，由于盲目测试条件下的NSPSM快速成像由于在实践中缺乏界面信息而难以实现。为了克服这种困难，基于虚拟点测量，提出了一种基于虚拟点测量的非平面两层系统的NSPSM成像的快速接口重建方法。在盲目测试条件下，通过第一个进入回声的飞行时间（TOF）在双层系统的非平面接口中创建了一系列虚拟点（VP）。然后，通过VP的插值快速建立双层系统的接口。最后，通过边界线实现了具有非平面界面的双层系统的NSPSM成像，用于区分耦合介质的速度和在相同的外推深度中的测试部分。成像结果表明，侧钻孔的位置正确地定位，算法的效率显着提高。因此，预计VP-NSPSM方法将在实际的NDT应用中实现具有非平面界面的两层系统的快速甚至实时成像。

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