基于磁通调制法的强磁场计量技术研究  

Research on Metrology Techniques for Strong Magnetic Fields Using the Magnetic Flux Modulation Method

作　　者：张宇博 李准[1] 鲁云峰[1,2] 贺青 ZHANG Yubo;LI Zhun;LU Yunfeng;HE Qing(National Institute of Metrology,Beijing 100029,China;Key Laboratory of Electrical Quantum Standards for State Market Regulation,Beijing 100029,China)

机构地区：[1]中国计量科学研究院,北京100029 [2]国家市场监管重点实验室(电学量子基准),北京100029

出　　处：《计量科学与技术》2023年第6期22-28,62,共8页Metrology Science and Technology

基　　金：国家重点研发计划项目(2022YFF0706902)。

摘　　要：恒稳强磁场在科学研究、生物医疗和材料科学等领域发挥着举足轻重的作用。针对超强磁场难以测量和溯源等问题,采用基于磁通调制原理的强磁场测量方法研制了高稳定强磁场测量装置,通过开发信号调理电路,利用锁相原理获得最佳信噪比,最终获得与被测强磁场磁感应强度相对应的感应电动势值。采用标准磁场对测量装置的线圈常数标定后,该线圈常数可作为传递标准,实现超强磁场的测量和校准。对1~7 T范围内超导强磁场开展测试和比对,并对测量装置及线圈常数进行了详细的不确定度分析评估,结果表明,1~7 T磁场测量的偏差优于0.083%,测量装置引入的相对不确定度达到3×10-4,这对于超强磁场的测量有重要的参考意义。Stable,strong magnetic fields are instrumental in scientific research,biomedicine,and material science.Addressing the challenges in measuring and tracing super-strong magnetic fields,we introduce a measurement method derived from the magnetic flux modulation principle,leading to the development of a highly stable magnetic field measuring instrument.By employing a refined signal conditioning circuit and harnessing the phase-locking principle to achieve optimal signal-to-noise ratio,we deduce the induced electromotive force corresponding to the magnetic induction intensity of the inspected strong magnetic field.Calibration of the instrument's coil constant with a standard magnetic field allows the constant to serve as a transfer standard,facilitating ultra-strong magnetic field measurements and calibrations.We examined superconducting strong magnetic fields within the 1-7 T range,providing an in-depth analysis and evaluation of the measuring device and coil constant.Our findings highlight that the measurement bias for the 1-7 T magnetic field is better than 0.083%.The relative uncertainty introduced by our instrument is up to 3×10−4,marking a significant advancement for ultra-strong magnetic field measurements.

关 键 词：计量学 强磁场 磁通调制 线圈 锁相放大器 不确定度 

分 类 号：TB972[一般工业技术—计量学]