Effects of temperature fluctuations on a SQUID-based superconducting gravimeter

Jiao Yu; Xianjun Hu; Xikai Liu; Dong Ma; Xiangdong Liu; Ning Zhang; Liang Chen

doi:10.1063/1.5135347

Effects of temperature fluctuations on a SQUID-based superconducting gravimeter

Rev Sci Instrum. 2020 May 1;91(5):054503. doi: 10.1063/1.5135347.

Authors

Jiao Yu¹, Xianjun Hu¹, Xikai Liu¹, Dong Ma¹, Xiangdong Liu¹, Ning Zhang¹, Liang Chen¹

Affiliation

¹ 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.

PMID: 32486740
DOI: 10.1063/1.5135347

Abstract

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)Φ₀/K, which, according to theoretical analysis, corresponds to a displacement change of (1.38 ± 0.04) × 10^-7 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.