Yu Jiao, Hu Xianjun, Liu Xikai, Ma Dong, Liu Xiangdong, Zhang Ning, Chen Liang
MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
Rev Sci Instrum. 2020 May 1;91(5):054503. doi: 10.1063/1.5135347.
A superconducting gravimeter based on the superconducting quantum interference device system is under development. As the main source of low-frequency noise, temperature fluctuations affect the resolution of superconducting gravimeters. In this study, a set of experimental devices was built to investigate the primary coupling processes of temperature fluctuations in superconducting gravimeters. Under the temperature modulation method, the effects of temperature fluctuations can be expressed as dΦ/dT = 342(2)Φ/K, which, according to theoretical analysis, corresponds to a displacement change of (1.38 ± 0.04) × 10 m/K. Based on these results, the ambient temperature is controlled to within ±100 µK, and the equivalent effect of temperature fluctuations on our superconducting gravimeter is 0.5 μGal.
一种基于超导量子干涉装置系统的超导重力仪正在研发中。作为低频噪声的主要来源，温度波动会影响超导重力仪的分辨率。在本研究中，搭建了一套实验装置来研究超导重力仪中温度波动的主要耦合过程。在温度调制方法下，温度波动的影响可表示为dΦ/dT = 342(2)Φ/K，根据理论分析，这对应于(1.38 ± 0.04) × 10 m/K的位移变化。基于这些结果，将环境温度控制在±100 µK以内，温度波动对我们的超导重力仪的等效影响为0.5微伽。
