Le Jeune Léonard, Robert Sébastien, Lopez Villaverde Eduardo, Prada Claire
CEA, LIST, Gif-sur-Yvette F-91191, France.
CEA, LIST, Gif-sur-Yvette F-91191, France.
Ultrasonics. 2016 Jan;64:128-38. doi: 10.1016/j.ultras.2015.08.008. Epub 2015 Aug 28.
This paper describes a new ultrasonic array imaging method for Non-Destructive Testing (NDT) which is derived from the medical Plane Wave Imaging (PWI) technique. The objective is to perform fast ultrasound imaging with high image quality. The approach is to transmit plane waves at several angles and to record the back-scattered signals with all the array elements. Focusing in receive is then achieved by coherent summations of the signals in every point of a region of interest. The medical PWI is generalized to immersion setups where water acts as a coupling medium and to multimodal (direct, half-skip modes) imaging in order to detect different types of defects (inclusions, porosities, cracks). This method is compared to the Total Focusing Method (TFM) which is the reference imaging technique in NDT. First, the two post-processing algorithms are described. Then experimental results with the array probe either in contact or in immersion are presented. A good agreement between the TFM and the PWI is observed, with three to ten times less transmissions required for the PWI.
本文介绍了一种用于无损检测（NDT）的新型超声阵列成像方法，该方法源自医学平面波成像（PWI）技术。其目标是实现具有高图像质量的快速超声成像。该方法是在多个角度发射平面波，并利用所有阵列元件记录后向散射信号。然后，通过对感兴趣区域中每个点的信号进行相干求和来实现接收聚焦。医学PWI被推广到以水作为耦合介质的浸入式设置以及多模态（直接、半跳模式）成像，以便检测不同类型的缺陷（夹杂物、孔隙、裂纹）。将该方法与无损检测中的参考成像技术全聚焦方法（TFM）进行了比较。首先，描述了两种后处理算法。然后给出了阵列探头在接触式或浸入式情况下的实验结果。观察到TFM和PWI之间有良好的一致性，PWI所需的传输次数比TFM少三到十倍。
