Bibliographic Details
| Title: |
Modeling of Thin Shielding Layer Based on Unstructured Grid Vector Finite Element Method and Analysis of its Effect on SQUID TEM Observation Signal. |
| Authors: |
Ma, Binyuan1 maby20@mails.jlu.edu.cn, Chang, Nansong1 changns24@mails.jlu.edu.cn, Ji, Yanju1,2 jiyj@jlu.edu.cn, Zhao, Xuejiao1,2 zhaoxuejiao@jlu.edu.cn, Luan, Hui1,2 luanhui@jlu.edu.cn |
| Source: |
Applied Computational Electromagnetics Society Journal. Mar2026, Vol. 41 Issue 3, p225-237. 13p. |
| Subjects: |
Electromagnetic shielding, Finite element method, Superconducting quantum interference devices, Maxwell equations, Numerical grid generation (Numerical analysis), Electromagnetic interference, Computer simulation, Maxwell, James Clerk, 1831-1879 |
| Abstract: |
Superconducting Quantum Interference Devices Time-Domain Electromagnetic Method (SQUID TEM) is currently the most accurate electromagnetic detection technology used in geophysics. However, SQUID is highly susceptible to electromagnetic interference in outdoor spaces, so it needs to work continuously and stably in a Dewar bucket wrapped with a metal shielding material. Therefore, the influence of the metal shielding thin layer on the observation signal cannot be ignored. We propose a vector finite element method based on unstructured grids to spatially model the sleeve formed by the metal shielding thin layer wrapped around the SQUID and analyze the influence of the metal shielding sleeve on the SQUID TEM observation signal. Firstly, we derive the governing equations from Maxwell’s equations. Secondly, the Galerkin method is used for finite element discretization of the control equations, and unstructured mesh discretization is applied to the metal shielding sleeve and other computational areas. By solving the interpolation basis functions of tetrahedral vector elements, the local equations of each element are obtained and combined into a global large sparse matrix. Finally, the direct solution method is used to calculate the electromagnetic response at the observation points inside the metal shielding sleeve. The effectiveness and universality of the proposed method are verified through numerical simulations. Furthermore, through field experiments in the Da Hinggan Ling area, the necessity of metal shielding sleeves in field experiments and the reliability of the calculation results proposed have been demonstrated. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
