摘要
针对基于量子效应的超高灵敏磁场测量装置线圈常数高精度测量问题,提出了利用电子顺磁共振技术,实现线圈常数原位精密测量方法。在分析自旋极化碱金属原子在外磁场下发生电子顺磁共振现象的基础上,明确了共振频率和外磁场强度之间的关联关系,利用洛伦兹线型拟合获取共振频率,据此获得磁场强度。鉴于线圈常数是电流幅值与产生磁场强度的函数,得到线圈常数值。实验测试结果表明,x,y,z三轴线圈常数具有较好的线性度,且分别为193.9nT/mA,122.5nT/mA,1040nT/mA。与传统方法相比,该方法能够高精度地测量线圈的常数,并有良好的重复性和稳定性。
A precise and in-situ measurement method of coil constant for ultra-sensitive magnetic field measurement devices,based on quantum effect,is demonstrated in this paper.By utilizing electron paramagnetic resonance(EPR)technology,the resonance frequency and external magnetic field intensity are correlated,and then the coil constants are obtained through Lorentzian fitting of the resonance frequency,which is based on the analysis of the EPR phenomenon of spin-polarized alkali metal atoms in an external magnetic field.Since the coil constants are functions of the current amplitude and the magnetic field intensity generated,the values of the coil constants are obtained.Experimental results show that the coil constants for the x,y,and z axes are linear with values of 193.9nT/mA,122.5nT/mA,and 1040nT/mA,respectively.Compared to traditional methods,this approach enables high-precision measurement of coil constants with good repeatability and stability.
作者
邹升
张全哲
张红
ZOU Sheng;ZHANG Quanzhe;ZHANG Hong(Institute of Large Scientific Devices,Beihang University,Beijing 100191;Hangzhou Institute of Extremely-Weak Magnetic Field Major National Science and Technology Infrastructure,Hangzhou 310051)
出处
《飞控与探测》
2024年第6期75-81,共7页
Flight Control & Detection
基金
国家自然科学基金委青年基金项目(52205549)。
关键词
原子自旋
弛豫
磁场测量
线圈常数
电子顺磁共振
atomic spin
relaxation
magnetic field measurement
coil constant
electron paramagnetic resonance
作者简介
邹升(1987-),男,博士,副研究员,博士生导师;通信作者:张红(1986-),女,博士,副研究员。
