【作者】 徐武嘉贝； 阙浩辉； 鲁涛； 向杰； 蔡勇； 戴家瑜； 侯雪玲；

【Author】 Wujiabei Xu;Haohui Que;Tao Lu;Jie Xiang;Yong Cai;Jiayu Dai;Xueling Hou;School of Materials Science and Engineering,Shanghai University,SHU;Laboratory of Time & Frequency Technology Research,Shanghai Astronomical Observatory,Chinese Academy of Science,SHAO;Shanghai Kingv Material Technology Co.,Ltd;School of Materials Science and Engineering,Shanghai University;

【机构】 上海大学； 中国科学院上海天文台； 上海晶维材料科技有限公司；

【摘要】 氢原子钟利用基态氢原子的超精细能级跃迁信号与晶体振荡器之间的锁定实现整机频率信号的稳定度性能。磁屏蔽系统主要负责屏蔽地球磁场和空间杂散磁场对氢原子跃迁信号的干扰,为满足导航系统的高性能和轻量化的要求,当前磁屏蔽系统可以做以下改进:1、进一步改善屏蔽层材料的磁屏蔽系数。2、进一步优化磁屏蔽系统结构。其原因在于:高磁导率可以提升性能的同时减少屏蔽壳的厚度,合理的结构设计可以减小磁屏蔽系统应振动性能下降。针对以上问题,我们测试了国内1J85的性能,并模拟仿真计算了测试结果和磁屏蔽系统的结构对磁屏蔽系统的影响。结果表明,1J85有着较好的初始磁导率,使得其在弱磁场下有着更好的矫顽力;微观形貌表明,1J85的晶粒分布均匀,尺寸较大,晶粒在越过磁畴时会受到更少的阻力。仿真结果表明,屏蔽系数可达108922,且锥顶和平顶对屏蔽系数影响不大,但平顶更易于加工,因此实际应用中优先平顶。通过对1J85的测试,为之后材料和结构的创新提供了思路,也为之后进一步开展对磁屏蔽系统高性能、多环境的应用研究提供可行性依据。更多还原

【Abstract】 The hydrogen maser uses the hyperfine level transition signal of the ground state hydrogen atom to lock the crystal oscillator to realize the stability of the frequency signal of the whole machine.The magnetic shielding system is mainly responsible for shielding the interference of Earth magnetic field and space stray magnetic field on the hydrogen atom transition signal.In order to meet the requirements of high performance and lightweight navigation system,the current magnetic shielding system can be improved as follows:1.Improve the magnetic shielding coefficient of the shielding layer material.2.Optimize the structure of the magnetic shield system.The reason is that high permeability can improve the performance and reduce the thickness of the shield shell.Reasonable structural design can reduce the vibration performance of the magnetic shield system.In view of the above problems,we test the performance of domestic 1J85,simulate and calculate the impact of the test results and the structure of the magnetic shield system on the magnetic shield system.The results show that 1J85 has better initial permeability,which makes it have better coercivity under weak magnetic field.The micro-structure of 1J85 shows that the grain distribution is uniform and the size is kind of large,and the grain will experience less resistance when crossing the magnetic domain.The simulation results show that the shielding coefficient can reach 108922,and the cone top and flat top have little influence on the shielding coefficient,but the flat top is easier to process,so the flat top is preferred in practical application.The test of 1J85 provides ideas for the innovation of materials and structure in the future,and also provides feasibility basis for further research on the application of magnetic shield system with high performance and multi-environment.更多还原