Superconducting gravity gradiometer for space and terrestrial applications
Journal Article
·
· J. Appl. Phys.; (United States)
A three-axis superconducting gravity gradiometer with a potential sensitivity better than 10/sup -3/ Eoetvoes Hz/sup -1//sup ///sup 2/ is currently under development for applications in space. Although such a high sensitivity may be needed for only a limited number of terrestrial applications, superconductivity offers many extraordinary effects which can be used to obtain a gravity gradiometer with other characteristics necessary for operation in a hostile moving-base environment. Utilizing a number of recently devised techniques which rely on certain properties of superconductors, we have produced a design for a sensitive yet rugged gravity gradiometer with a high degree of stability and a common-mode rejection ratio greater than 10/sup 9/. With a base line of 0.11 m, a sensitivity of 0.1 Eoetvoes Hz/sup -1//sup ///sup 2/ is expected in an environment monitored to a level of 10/sup -2/ m s/sup -2/ Hz/sup -1//sup ///sup 2/ for linear vibration and 7 x 10/sup -6/ rad s/sup -1/ Hz/sup -1//sup ///sup 2/ for angular vibration. A conventional stabilized platform can be used at this level. The intrinsic noise level, which is two orders of magnitude lower, could be achieved by monitoring the attitude with a superconducting angular accelerometer which is under development. In addition, the new gradiometer design has the versatility of adapting the instrument to different gravity biases by adjusting stored dc currents.
- Research Organization:
- Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
- OSTI ID:
- 6994232
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 60:12; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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