Characteristic analysis of scattering field in two-layer media by Green's function
Ping Zhang(张萍)1,2,†, Zhi-Ying Liu(刘智颖)1,3,†, Shou-Guo Yan(阎守国)1,‡, Juan Huang(黄娟)1, and Bi-Xing Zhang(张碧星)1,3
1 Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China; 2 Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China; 3 University of Chinese Academy of Sciences, Beijing 100190, China
Abstract The problem of three-dimensional (3D) acoustic scattering in a complex medium has aroused considerable interest of researchers for many years. An ultrasonic scattered field calculating technique is proposed to study the scattering echo from strongly scattered materials in a two-layer medium in this work. Firstly, with the high frequency stationary phase method, the Green's function of two-layer fluid media is derived. And then based on the idea of integral equation discretization, the Green's function method is extended to two-layer fluid media to derive the scattering field expression of defects in a complex medium. With this method, the scattering field of 3D defect in a two-layer medium is calculated and the characteristics of received echoes are studied. The results show that this method is able to solve the scattering P wave field of 3D defect with arbitrary shape at any scattering intensity in two-layer media. Considering the circumstance of water-immersion ultrasonic non-destructive test (NDT), the scattering sound field characteristics of different types of defects are analyzed by simulation, which will help to optimize the detection scheme and corresponding imaging method in practice so as to improve the detection quality.
Fund: Project supported by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. ZDBS-LY-7023).
Corresponding Authors:
Shou-Guo Yan
E-mail: yanshouguo@mail.ioa.ac.cn
Cite this article:
Ping Zhang(张萍), Zhi-Ying Liu(刘智颖), Shou-Guo Yan(阎守国), Juan Huang(黄娟), and Bi-Xing Zhang(张碧星) Characteristic analysis of scattering field in two-layer media by Green's function 2023 Chin. Phys. B 32 064301
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