中国物理B ›› 2023, Vol. 32 ›› Issue (5): 50702-050702.doi: 10.1088/1674-1056/acae73
Min-Na Qiao(乔敏娜)1, Lu-Hua Liu(刘鲁华)1, Bo-Song Cai(蔡柏松)1, Ya-Ting Zhang(张雅婷)2,†, Qing-Lan Wang(王晴岚)3, Jia-Hao Xu(徐家豪)4,‡, and Qi Liu(刘祺)4
Min-Na Qiao(乔敏娜)1, Lu-Hua Liu(刘鲁华)1, Bo-Song Cai(蔡柏松)1, Ya-Ting Zhang(张雅婷)2,†, Qing-Lan Wang(王晴岚)3, Jia-Hao Xu(徐家豪)4,‡, and Qi Liu(刘祺)4
摘要: In TianQin spaceborne gravitational-wave detectors, the stringent requirements on the magnetic cleanliness of the test masses demand the high resolution ground-based characterization measurement of their magnetic properties. Here we present a single frequency modulation method based on a torsion pendulum to measure the remanent magnetic moment $m_{\rm r}$ of $1.1$ kg dummy copper test mass, and the measurement result is $(6.45\pm0.04(\rm{stat})\pm0.07(\rm{syst}))\times10^{-8} \rm{A\cdot m^2}$. The measurement precision of the $m_{\rm r}$ is about $0.9 \rm{nA\cdot m^2}$, well below the present measurement requirement of TianQin. The method is particularly useful for measuring extremely low magnetic properties of the materials for use in the construction of space-borne gravitational wave detection and other precision scientific apparatus.
中图分类号: (Magnetometers for susceptibility, magnetic moment, and magnetization measurements)