中国物理B ›› 2023, Vol. 32 ›› Issue (4): 40601-040601.doi: 10.1088/1674-1056/ac9361

• • 上一篇    下一篇

Precision measurement and suppression of low-frequency noise in a current source with double-resonance alignment magnetometers

Jintao Zheng(郑锦韬)1,2, Yang Zhang(张洋)1,2, Zaiyang Yu(鱼在洋)1,2,3, Zhiqiang Xiong(熊志强)1,2, Hui Luo(罗晖)1,2, and Zhiguo Wang(汪之国)1,2,†   

  1. 1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China;
    2 Hunan Key Laboratory of Mechanism and Technology of Quantum Information, National University of Defense Technology, Changsha 410073, China;
    3 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710049, China
  • 收稿日期:2022-07-05 修回日期:2022-09-08 接受日期:2022-09-21 出版日期:2023-03-10 发布日期:2023-03-17
  • 通讯作者: Zhiguo Wang E-mail:maxborn@nudt.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12174446 and 61671458).

Precision measurement and suppression of low-frequency noise in a current source with double-resonance alignment magnetometers

Jintao Zheng(郑锦韬)1,2, Yang Zhang(张洋)1,2, Zaiyang Yu(鱼在洋)1,2,3, Zhiqiang Xiong(熊志强)1,2, Hui Luo(罗晖)1,2, and Zhiguo Wang(汪之国)1,2,†   

  1. 1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China;
    2 Hunan Key Laboratory of Mechanism and Technology of Quantum Information, National University of Defense Technology, Changsha 410073, China;
    3 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710049, China
  • Received:2022-07-05 Revised:2022-09-08 Accepted:2022-09-21 Online:2023-03-10 Published:2023-03-17
  • Contact: Zhiguo Wang E-mail:maxborn@nudt.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12174446 and 61671458).

摘要: Low-noise high-stability current sources have essential applications such as neutron electric dipole moment measurement and high-stability magnetometers. Previous studies mainly focused on frequency noise above 0.1 Hz while less on the low-frequency noise/drift. We use double resonance alignment magnetometers (DRAMs) to measure and suppress the low-frequency noise of a homemade current source (CS) board. The CS board noise level is suppressed by about 10 times in the range of 0.001-0.1 Hz and is reduced to $100 \mathrm{nA/}\sqrt {\mathrm{Hz}} $ at 0.001 Hz. The relative stability of CS board can reach $2.2\times {10}^{-8}$. In addition, the DRAM shows a better resolution and accuracy than a commercial 7.5-digit multimeter when measuring our homemade CS board. Further, by combining the DRAM with a double resonance orientation magnetometer, we may realize a low-noise CS in the 0.001-1000 Hz range.

关键词: precision measurement, current noise suppression, low frequency, double-resonance alignment magnetometer

Abstract: Low-noise high-stability current sources have essential applications such as neutron electric dipole moment measurement and high-stability magnetometers. Previous studies mainly focused on frequency noise above 0.1 Hz while less on the low-frequency noise/drift. We use double resonance alignment magnetometers (DRAMs) to measure and suppress the low-frequency noise of a homemade current source (CS) board. The CS board noise level is suppressed by about 10 times in the range of 0.001-0.1 Hz and is reduced to $100 \mathrm{nA/}\sqrt {\mathrm{Hz}} $ at 0.001 Hz. The relative stability of CS board can reach $2.2\times {10}^{-8}$. In addition, the DRAM shows a better resolution and accuracy than a commercial 7.5-digit multimeter when measuring our homemade CS board. Further, by combining the DRAM with a double resonance orientation magnetometer, we may realize a low-noise CS in the 0.001-1000 Hz range.

Key words: precision measurement, current noise suppression, low frequency, double-resonance alignment magnetometer

中图分类号:  (Standards and calibration)

  • 06.20.fb
06.30.Ka (Basic electromagnetic quantities) 07.55.Jg (Magnetometers for susceptibility, magnetic moment, and magnetization measurements)