Title:
SUPERCONDUCTING GRAVITY GRADIOMETER, AND METHOD FOR IMPROVING SENSITIVITY THEREOF
Document Type and Number:
WIPO Patent Application WO/2021/114604
Kind Code:
A1
Abstract:
A superconducting gravity gradiometer, and a method for improving the sensitivity thereof. The superconducting gravity gradiometer comprises: paired superconducting test masses (2, 6), paired negative-stiffness superconducting coils (3, 7), paired positive-stiffness superconducting coils (1, 5) and a superconducting circuit for coupling the paired test masses (2, 6) to create a two-degrees-of-freedom superconducting magnetic spring oscillator. The main points of the superconducting gravity gradiometer lie in that the negative-stiffness superconducting coils (3, 7) are introduced, and the negative-stiffness superconducting coils (3, 7) are connected in series by using a superconducting wire to form the superconducting circuit, so as to reduce the differential-mode stiffness of the two-degrees-of-freedom superconducting magnetic spring oscillator, and increase the ratio of common-mode stiffness to the differential-mode stiffness. When the method is used to construct the magnetic spring oscillator of the superconducting gravity gradiometer, especially construct a vertical diagonal component superconducting gravity gradiometer with the fully-magnetically-levitated test masses (2, 6), the sensitivity of gradient measurement can be significantly improved; and a common-mode rejection ratio is increased, thereby rejecting the interference of the motion acceleration of a mounting platform in the gradient measurement.
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Inventors:
LIU XIANGDONG (CN)
LIU XIKAI (CN)
MA DONG (CN)
WANG LULU (CN)
LIU XIKAI (CN)
MA DONG (CN)
WANG LULU (CN)
Application Number:
PCT/CN2020/097619
Publication Date:
June 17, 2021
Filing Date:
June 23, 2020
Export Citation:
Assignee:
UNIV HUAZHONG SCIENCE TECH (CN)
International Classes:
G01V7/00
Domestic Patent References:
| WO2014007848A1 | 2014-01-09 |
Foreign References:
| CN111007573A | 2020-04-14 | |||
| CN108918913A | 2018-11-30 | |||
| CN105911487A | 2016-08-31 | |||
| CN102608668A | 2012-07-25 | |||
| CN107795631A | 2018-03-13 |
Other References:
LIU XIANG-DONG, LIU XI-KAI; MA DONG; CHEN LIANG; ZHANG NING: "Superconducting Gravity Instrument:Opportunities and Challenges", NAVIGATION AND CONTROL, vol. 18, no. 3, 1 June 2019 (2019-06-01), pages 48 - 48, XP055822754, ISSN: 1674-9030
Attorney, Agent or Firm:
WUHAN HUAZHIYU INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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