Experimental study of A0 Lamb wave tomography
Experimental study of A0 Lamb wave tomography
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DOI：
10.1063/1.4914616
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
M. Seher;P. Huthwaite;M. Lowe;P. Cawley
中科院分区：
文献类型：
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作者：
M. Seher;P. Huthwaite;M. Lowe;P. Cawley
难以接近区域的腐蚀损坏对石化行业提出了重大挑战，确定剩余壁厚对于确定剩余使用寿命非常重要。导波断层扫描是一种解决方案，并且涉及通过感兴趣区域发射兰姆波，并使用接收到的信号来重建剩余的壁厚度。这就避免了需要访问表面上的所有点，使该技术非常适合于检查支撑下。为此，开发了一种用于管道检测的层析成像系统，该系统使用低频A0兰姆波，该兰姆波由两个电磁声换能器阵列（EMAT）激发和检测。两个不同的缺陷深度被认为是不同的对比度相对于标称壁厚，并在第一步中，测量的可重复性进行了论证。由于有限的视图阵列配置，重建的最大深度低估了真实深度。在第二个E…
Corrosion damage in inaccessible regions presents a significant challenge to the petrochemical industry, and determining the remaining wall thickness is important to establish the remaining service life. Guided wave tomography is one solution and involves transmitting Lamb waves through the area of interest and using the received signals to reconstruct the remaining wall thickness. This avoids the need to access all points on the surface, making the technique well suited to inspection beneath supports. For this purpose a tomography system for pipe inspections is developed using low frequency A0 Lamb waves that are excited and detected with two arrays of electromagnetic acoustic transducers (EMATs). Two different defect depths are considered with different contrasts relative to the nominal wall thickness and in a first step, the repeatability of the measurements is demonstrated. Due to the limited view array configuration, the maximum depth of the reconstruction underestimates the true depth. In a second e...