| INSTRUMENTATION AND MEASUREMENT |
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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 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 |
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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.
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Received: 05 July 2022
Revised: 08 September 2022
Accepted manuscript online: 21 September 2022
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PACS:
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06.20.fb
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(Standards and calibration)
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06.30.Ka
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(Basic electromagnetic quantities)
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07.55.Jg
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(Magnetometers for susceptibility, magnetic moment, and magnetization measurements)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12174446 and 61671458). |
Corresponding Authors:
Zhiguo Wang
E-mail: maxborn@nudt.edu.cn
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Cite this article:
Jintao Zheng(郑锦韬), Yang Zhang(张洋), Zaiyang Yu(鱼在洋),Zhiqiang Xiong(熊志强), Hui Luo(罗晖), and Zhiguo Wang(汪之国) Precision measurement and suppression of low-frequency noise in a current source with double-resonance alignment magnetometers 2023 Chin. Phys. B 32 040601
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