摘要
In Tian Qin 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 mr of 1.1 kg dummy copper test mass, and the measurement result is(6.45 ± 0.04(stat) ± 0.07(syst)) × 10^(-8)A · m^(2). The measurement precision of the mr is about 0.9 n A · m^(2), well below the present measurement requirement of Tian Qin. 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.
作者
乔敏娜
刘鲁华
蔡柏松
张雅婷
王晴岚
徐家豪
刘祺
Min-Na Qiao;Lu-Hua Liu;Bo-Song Cai;Ya-Ting Zhang;Qing-Lan Wang;Jia-Hao Xu;Qi Liu(School of Aeronautics and Astronautics,Sun Yat-sen University,Guangzhou 510275,China;School of Physics and Electronic Engineering,Hubei University of Arts and Science,Xiangyang 441053,China;School of Mathematics,Physics and Optoelectronic Engineering,Hubei University of Automotive Technology,Shiyan 442002,China;MOE Key Laboratory of TianQin Mission,TianQin Research Center for Gravitational Physics&School of Physics and Astronomy,Frontiers Science Center for TianQin,Gravitational Wave Research Center of CNSA,Sun Yat-sen University(Zhuhai Campus),Zhuhai 519082,China)
基金
supported by the National Key R&D Program of China (Grant No. 2020YFC2200500)
the National Natural Science Foundation of China (Grant Nos. 12075325, 12005308, and 11605065)。