We present in this work an ultrasonic imaging technique based on wavefield cross-correlation that has potential for high-resolution inspecting of plates and plate-like structures. A curved transmit/receive array setup is used for acquiring wide-aperture waveform data beneficial for applying the presented imaging condition. An additional dispersion analysis using waveform data received by a linear array allows one to reveal the excited guided wave modes and possibly determine the shear wave velocity as an input parameter in the 3D wavefield simulation. Using synthetic but realistic data generated by realistic 3D simulations, we demonstrate the invariance of the time reversal process and the capability of the presented imaging approach for ultrasonic testing based on Lamb waves. In addition to the ability to localise and size multiple defects simultaneously, this imaging approach does not require baseline data and involves only minimal waveform data pre-processing.

中文翻译：

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引导超声场与曲线阵列的互相关，用于高分辨率板检测

我们在这项工作中提出了一种基于波场互相关的超声成像技术，该技术具有对板和板状结构进行高分辨率检查的潜力。弯曲的发射/接收阵列设置用于获取有利于应用显示的成像条件的宽孔径波形数据。使用线性阵列接收的波形数据进行的另一种色散分析，可以揭示激励的导波模式，并有可能将剪切波速度确定为3D波场模拟中的输入参数。使用通过逼真的3D仿真生成的合成但逼真的数据，我们证明了时间逆转过程的不变性以及所提出的基于Lamb波的超声测试成像方法的能力。