公开(公告)号：US20220299674A1

公开(公告)日：2022-09-22

申请号：US17629414

申请日：2020-06-23

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiangdong LIU ,  Xikai LIU ,  Dong MA ,  Lulu WANG

IPC: G01V7/04 ,  H01L39/08

Abstract: The invention discloses a superconducting gravity gradiometer and a sensitivity improvement method thereof including a pair of superconducting test masses, a pair of negative-stiffness superconducting coils, a pair of positive-stiffness superconducting coils, and a superconducting circuit coupling the test masses into two-degree-of-freedom superconducting magnetic spring oscillators. Superconducting wires are used to connect the negative-stiffness superconducting coils in series to form a superconducting loop, the differential mode stiffness of the two-degree-of-freedom superconducting magnetic spring oscillators is reduced, and the ratio of the common mode stiffness to the differential mode stiffness is increased. When using the method of the invention to configure the magnetic spring oscillator of a superconducting gravity gradiometer, when configuring a vertical diagonal component superconducting gravity gradiometer with a full magnetic suspension for the test mass, the sensitivity of gradient measurement is significantly improved.