Development of SQUID detection technology for a superconducting gravimeter

Abstract

In this paper, we present research on the development of SQUID (Superconducting QUantum Interference Device) detection technology for a superconducting gravimeter (SG), aiming to achieve precise real-time measurements of gravity. We provide an introduction to the composition and internal details of the SQUID-based superconducting gravimeter (SSG). The internal components of the SSG are designed based on theoretical calculations to optimize the system and enhance its sensitivity. With the current in the levitation coil set to persistent mode, a unique proof mass is levitated through electromagnetic force. We demonstrate the equilibrium position of the levitated proof mass by assessing the change in the coil inductance. Furthermore, we present preliminary experimental results of earth tidal measurements using the developed SQUID detection technology and compare these outcomes with measurements from an absolute gravimeter (FG5X) and with theoretical calculations. These comparisons confirm the potential of the proposed new gravity measurement technology.