Surface reconstruction accuracy using ultrasonic arrays: Application to non-destructive testing
Surface reconstruction accuracy using ultrasonic arrays: Application to non-destructive testing
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DOI：
10.1016/j.ndteint.2018.03.004
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发表时间：
2018-06-01
影响因子：
4.2
通讯作者：
Drinkwater, Bruce W.
中科院分区：
文献类型：
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作者：
Malkin, Robert E.;Franklin, Amanda C.;Drinkwater, Bruce W.
利用超声浸没成像技术对工程结构进行精确的无损检测，需要对结构表面进行精确的表示。在这里，我们调查的表面几何形状，表面测量误差，使用超声波阵列和总聚焦方法（TFM）之间的关系，以及如何影响的能力，图像的一个组件内的功能。表面形状为正弦波覆盖的表面波长（0.8至32 λ（水））和振幅（0.6至9 λ（水））的组合进行了研究。表面重建误差被示出为引起成像中的误差，诸如侧钻孔的图像的幅度减小和模糊。这些重建误差示出的正弦曲线的最大梯度迅速增加。最大梯度< 45度的正弦表面导致平均表面重建误差<λ（水），并且幅度成像误差在平坦表面情况的6dB内。它还表明，如果表面梯度是过于陡峭，得到非常差的结果。
The accurate non-destructive inspection of engineering structures using ultrasonic immersion imaging requires a precise representation of the surface of the structure. Here we investigate the relationship between surface geometry, surface measurement error using ultrasonic arrays and the total focusing method (TFM) and how this impacts on the ability to image a feature within a component. Surfaces shaped as sinusoids covering combinations of surface wavelengths (0.8 to 32 lambda(water)) and amplitudes (0.6 to 9 lambda(water)) are studied. The surface reconstruction errors are shown to cause errors in imaging, such as reduced amplitude and blurring of the image of a side-drilled hole. These reconstruction errors are shown to increase rapidly with the maximum gradient of the sinusoid. Sinusoidal surfaces with maximum gradients < 45 degrees lead to average surface reconstruction errors < lambda(water) and amplitude imaging errors within 6 dB of the flat-surface case. It is also shown that very poor results are obtained if the surface gradient is excessively steep.