GAO Jian1,2, ZHAO Juan1,2, MA Zong-min1,2, FU Yue-ping1,2, ZHANG Shao-wen1,2,
LIN Zhao-dong1,2, SONG Jian1,2
(1. Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China； 2. School of Instrument and Electronics, North University of China, Taiyuan 030051, China)
Abstract： In view of the low resolution and accuracy of traditional magnetometer, a method of microwave frequency modulation technology based on nitrogen-vacancy(NV) center in diamond for magnetic detection was proposed. The magnetometer studied can reduce the frequency noise of system and improve the magnetic sensitivity by microwave frequency modulation. Firstly, ESR spectra by sweeping the microwave frequency was obtained. Further, the microwave frequency modulated was gained through the mixed high-frequency sinusoidal modulation signal generated by signal generator. In addition, the frequency through the lock-in amplifier was locked, and the signal which was proportional to the first derivative of the spectrum was obtained. The experimental results show that the sensitivity of magnetic field detection can reach 17.628 nT/Hz based on microwave frequency modulation technology. The method realizes high resolution and sensitivity for magnetic field detection.
Key words： solid state spin system； nitrogen vacancy (NV) center; microwave frequency modulation; magnetic sensitivity technology; lock-in amplifier
CLD number： O77+3 Document code： A
Article ID： 1674-8042（2018）02-0188-06 doi： 10.3969/j.issn.1674-8042.2018.02.014
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基于固态自旋系综NV色心微波调制的磁传感技术研究
高健1,2， 赵娟1,2， 马宗敏1,2， 傅月平1,2， 张少文1,2， 林朝东1,2， 宋健1,2
（1. 中北大学 电子测试技术重点实验室， 山西 太原 030051； 2. 中北大学 仪器与电子学院， 山西 太原 030051）
摘要:针对传统磁场检测设备分辨率低、 测量精度低的现状， 提出了一种基于金刚石NV色心微波频率调制进行磁检测的方法。 通过频率调制方法， 可以降低测量系统中低频噪音干扰， 提高测量灵敏度。 首先通过扫描微波频率得到ESR谱线， 然后利用混合高频正弦调制信号进行频率调制， 并使用锁相放大器对频率进行锁定， 得到频率与光谱一阶导数成比例的信号。 实验结果表明， 磁场检测灵敏度可达 17.628 nT/Hz。 该方法实现了高分辨率、 高灵敏度的磁场检测。
关键词:固态自旋系综； NV色心； 微波频率调制； 磁传感技术； 锁相放大器
引用格式：GAO Jian, ZHAO Juan, MA Zong-min, et al. Magnetic sensitivity technology based on microwave modulation of solid state spin system NV center. Journal of Measurement Science and Instrumentation, 2018, 9(2)： 188-193. ［doi： 10.3969／j.issn.1674-8042.2018.02.014］
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