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

作　　者：郑锦韬 张洋 鱼在洋 熊志强 罗晖 汪之国 Jintao Zheng;Yang Zhang;Zaiyang Yu;Zhiqiang Xiong;Hui Luo;Zhiguo Wang(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;Hunan Key Laboratory of Mechanism and Technology of Quantum Information,National University of Defense Technology,Changsha 410073,China;School of Physics and Information Technology,Shaanxi Normal University,Xi’an 710049,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第4期35-41,共7页中国物理B（英文版）

基　　金：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 n A/√Hz at 0.001 Hz. The relative stability of CS board can reach2.2 × 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 

分 类 号：TM937[电气工程—电力电子与电力传动]