非连续磁介质大型纳特级零磁装置性能分析及设计方法研究

Room size and nT level magnetic field facility is indispensable for acquiring extremely weak magnetic signals as well as ensuring the accuracy of magnetometers, and has been proposed in National Large Research Infrastructure Program. Domestic nearly zero magnetic field facility is quite behind the world-class level, and even the most advantages facilities have the problem which is the design targets are quite different with the real performances. According to research status, the reason for that is complicated, including the incomplete material parameters, the unclear comprehensive effects of two shielding mechanisms (the flux shunting and the eddy current cancellation), and the indistinct decrease of shielding factor induced by edges/holes/gaps. In this project, the parameters of high permeability material in weak magnetic field and low frequency magnetic field will be obtained, the calculated principle of combination result of two shielding mechanisms will be improved, and the analysis method of reduction of shielding factor lead by discontinuous magnetic medium will be established. The research contents will improve the analysis and design theory of nearly zero magnetic field facility, to provide a basis of construction of room size and nT level magnetic field environment.

大型纳特级零磁装置是研究微弱磁信号的必备环境，也是精密磁测量装置等高端科学仪器设备得以实现的必要条件，已被列入国家重大科技基础设施建设规划。目前，国内零磁装置性能与国际相比差距较大，并且世界先进水平的零磁装置依然存在理论设计值与实现值相差巨大的问题。通过研究现状的分析，该问题原因在于高导磁材料已知导磁特性不完整，屏蔽层中通量分流和涡流消除两种屏蔽机理的综合作用分析方法缺失，大尺寸零磁环境引入的边角、孔洞、缝隙、屏蔽层内间隙等不连续因素严重影响整体屏蔽性能且规律不清。本项目的申请旨在：探寻微弱磁场和低频磁场下高导磁材料的导磁特性，揭示交变磁场下两种屏蔽机理的综合作用机制，建立计及不连续磁介质因素的屏蔽性能计算方法，完善零磁装置分析、设计理论，为实现大尺寸纳特级磁环境提供理论基础与技术支撑。

大型纳特级零磁装置是研究微弱磁信号的必备环境，也是精密磁测量装置等高端科学仪器设备得以实现的必要条件，已被列入国家重大科技基础设施建设规划。目前，国内零磁装置性能与国际相比差距较大，并且世界先进水平的零磁装置依然存在理论设计值与实现值相差巨大的问题。通过研究现状的分析，该问题原因在于高导磁材料已知导磁特性不完整，屏蔽层中通量分流和涡流消除两种屏蔽机理的综合作用分析方法缺失，大尺寸零磁环境引入的边角、孔洞、缝隙、屏蔽层内间隙等不连续因素严重影响整体屏蔽性能且规律不清。本项目基本实现了之前预定的目标：探寻微弱磁场和低频磁场下高导磁材料的导磁特性，揭示交变磁场下两种屏蔽机理的综合作用机制，建立计及不连续磁介质因素的屏蔽性能计算方法，完善零磁装置分析、设计理论，为实现大尺寸纳特级磁环境提供理论基础与技术支撑。