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

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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.