APPLICATION OF TIME-REVERSAL METHOD USING TOPOLOGICAL SENSITIVITY FOR DEFECT DETECTION TO 3-D MATRIX ARRAY TESTING

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  • トポロジー感度を欠陥検出指標に用いた時間反転法の三次元マトリクスアレイ探傷法への応用

Abstract

<p>In this paper, a novel shape reconstruction method based on the time-reversal technique is presented for the purpose of quantification of the ultrasonic nondestructive testing. First, a forward analysis of 3-D scalar wave scattering by rigid scatterers in an infinite region is solved by using the convolution quadrature time-domain boundary element method (CQBEM), which can produce higher accuracy than conventional time-domain boundary element method (BEM). In the proposed method, the topological sensitivity is used to identify the shape and position of defects in 3-D infinite space, and it is obtained by solving the corresponding adjoint problem of the forward one with the aid of CQBEM for 3-D scalar wave propagation. As numerical examples, some numerical results of shape reconstruction of a scatterer and multi-scatterers in an infinite space using the proposed method are demonstrated. The reconstruction ability of the proposed method is investigated by changing the radiation pattern of ultrasound from a phased array transducer and the number of scatterers, and by comparing the results obtained by the synthetic aperture focusing technique (SAFT).</p>

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