Closed-crack imaging method, subharmonic phased array for crack evaluation (SPACE) , for curved surfaces

在无损检测领域中，“曲面”和“闭合裂纹”是我们需要解决的两大问题。到目前为止，我们已经开发了一种闭合裂纹成像方法，亚谐波相控阵裂纹评价（SPACE）。在这项研究中，我们提出了一种新的成像方法相结合的空间和国家的最先进的阵列换能器，柔性阵列换能器，它可以符合一个曲面。首先，我们制定了一个成像算法下的曲率的考虑。设计并制作了柔性阵列换能器。利用扫描激光干涉仪对柔性阵列换能器的声场进行了测量。因此，我们证明了空间的基本性能，它可以适用于任意曲面。

In the field of nondestructive evaluation, "curved surface" and "closed crack" are two big problems that we need to resolve. Thus far we have developed an closed-crack imaging method, subharmonic phased array for crack evaluation (SPACE). In this study, we propose a new imaging method by combining SPACE and state-of-the-art array transducer, flexible array transducer, which can conform a curved surface. First we formulated an imaging algorithm under a consideration of curvature. We designed and fabricated the flexible array transducer. Furthermore, we measured the sound field due to the flexible array transducer by utilizing the scanning laser interferometer. Thus we demonstrated the fundamental performance of SPACE which can be applied to an arbitrary curved surface.