Gravimeter using high-temperature superconductor bearing.

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Description

We have developed a sensitive gravimeter concept that uses an extremely low-friction bearing based on a permanent magnet (PM) levitated over a high-temperature superconductor (HTS). A mass is attached to the PM by means of a cantilevered beam, and the combination of PM and HTS forms a bearing platform that has low resistance to rotational motion but high resistance to horizontal, vertical, or tilting motion. The combination acts as a low-loss torsional pendulum that can be operated in any orientation. Gravity acts on the cantilevered beam and attached mass, accelerating them. Variations in gravity can be detected by time-of-flight acceleration, ... continued below

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16 p.

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Hull, J. R. September 11, 1998.

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Description

We have developed a sensitive gravimeter concept that uses an extremely low-friction bearing based on a permanent magnet (PM) levitated over a high-temperature superconductor (HTS). A mass is attached to the PM by means of a cantilevered beam, and the combination of PM and HTS forms a bearing platform that has low resistance to rotational motion but high resistance to horizontal, vertical, or tilting motion. The combination acts as a low-loss torsional pendulum that can be operated in any orientation. Gravity acts on the cantilevered beam and attached mass, accelerating them. Variations in gravity can be detected by time-of-flight acceleration, or by a control coil or electrode that would keep the mass stationary. Calculations suggest that the HTS gravimeter would be as sensitive as present-day superconducting gravimeters that need cooling to liquid helium temperatures, but the HTS gravimeter needs cooling only to liquid nitrogen temperatures.

Physical Description

16 p.

Notes

OSTI as DE00010690

Medium: P; Size: 16 pages

Source

  • 1998 Applied Superconductivity Conference, Palm Desert, CA (US), 09/13/1998--09/18/1998

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  • Report No.: ANL/ET/CP-95921
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10690
  • Archival Resource Key: ark:/67531/metadc628367

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • September 11, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 3:17 p.m.

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Hull, J. R. Gravimeter using high-temperature superconductor bearing., article, September 11, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc628367/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.