A STUDY OF MAGNETIC FIELD INTERFERENCE IN THE LOW TEMPERATURE SUPERCONDUCTING DISPLACEMENT SENSING

The low temperature superconducting displacement sensing is one of the most sensitive methods of detecting displacement,and an important technology in gravity measurement and gravitational waves detection.In gravity measurement experiments based on low temperature superconducting displacement sensing,magnetic field disturbances are serious constraints to improve the accuracy.This paper studies the influence of various magnetic fields on the acceleration measurement and their mechanisms at liquid helium temperature,measured the coupling stiffness between the gravity source and detector,and the shielding efficiency of the superconducting magnetic shield to the external magnetic field.The mechanism of residual differential acceleration perturbation caused by magnetic field is studied; and we propose reasonable suggestions to improve the experiment.