船载古地磁屏蔽室通过高导磁坡莫合金屏蔽材料在内部构建低通密度的近零磁空间，为长岩芯超导磁力仪等设备提供洁净的工作磁场环境。受船体航向改变磁屏蔽层磁化程度不同导致古地磁屏蔽室性能下降，传统的消磁方法效果不佳。基于有限元法（FEM），对古地磁屏蔽室在不同航向下磁化程度仿真分析，提出一种适用于船载古地磁屏蔽室的消磁方法，配置一套消磁系统，通过试验验证能够恢复到剩余磁场小于100 nT的初始技术状态。
The shipborne paleomagnetic shielding room uses high-permeability permalloy shielding materials to create a low-flux density near-zero magnetic space inside, providing a clean magnetic field environment for equipment such as long-core superconducting magnetometers. The performance of the paleomagnetic shielding room declines due to different degrees of magnetization in the shielding layers caused by changes in the ship's heading, and traditional demagnetization methods are ineffective. Based on the finite element method (FEM), we performed a simulation analysis of the magnetization degree of the paleomagnetic shielding room under different headings and proposed a demagnetization method suitable for shipborne paleomagnetic shielding rooms. A demagnetization system was configured, and tests verified that it could restore the initial technical state with a residual magnetic field of less than 100 nT.
2025,47(9): 139-145 收稿日期：2024-6-18
DOI：10.3404/j.issn.1672-7649.2025.09.024
分类号：U662
作者简介：周昌剑（1988-），男，硕士，高级工程师，研究方向为磁屏蔽防护
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