Characteristic analysis of scattering field in two-layer media by Green's function

doi:10.1088/1674-1056/aca3a0

中国物理B ›› 2023, Vol. 32 ›› Issue (6): 64301-064301.doi: 10.1088/1674-1056/aca3a0

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

收稿日期:2022-09-22 修回日期:2022-11-09 接受日期:2022-11-17 出版日期:2023-05-17 发布日期:2023-06-05
通讯作者: Shou-Guo Yan E-mail:yanshouguo@mail.ioa.ac.cn
基金资助:
Project supported by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. ZDBS-LY-7023).

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

Received:2022-09-22 Revised:2022-11-09 Accepted:2022-11-17 Online:2023-05-17 Published:2023-06-05
Contact: Shou-Guo Yan E-mail:yanshouguo@mail.ioa.ac.cn
Supported by:
Project supported by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. ZDBS-LY-7023).

摘要/Abstract

摘要： 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.

关键词: Green's function method, two-layer media, scattering field, water-immersed detection

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.

Key words: Green's function method, two-layer media, scattering field, water-immersed detection

中图分类号: (General linear acoustics)

43.20.+g

43.35.+d (Ultrasonics, quantum acoustics, and physical effects of sound) 43.90.+v (Other topics in acoustics)

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[J]. 中国物理B, 2023, 32(6): 64301-064301.

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Characteristic analysis of scattering field in two-layer media by Green's function

Characteristic analysis of scattering field in two-layer media by Green's function

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