Title:
GRAVITATIONAL GRADIOMETER
Document Type and Number:
WIPO Patent Application WO/2011/001154
Kind Code:
A3
Abstract:
Apparatus for the measurement of quasi-static gravity gradients comprising: a flexible ribbon (3) held under tension at both longitudinal ends (5,7); sensing means (20) arranged to detect the transverse displacement of the ribbon from an undisturbed position due to the gravitational field acting on said ribbon and to generate a signal representing the displacement; and output means coupled to said sensing means and responsive to said displacement signal to generate an output signal which is a function of the gravitational gradient tensor of the gravitational field. To modulate the response of the apparatus to gravitational gradients, the apparatus further comprises ribbon stiffening means (10) operable to change the ribbon from a normal state to a stiffened state in which the displacement of the ribbon due to the gravitational field is reduced; and control means (13) to periodically operate the stiffening means. In use, the control means periodically operates the stiffening means at regular intervals so as to modulate the stiffness of the ribbon and the displacement signal, and the output means demodulates the displacement signal by synchronous detection using a signal representing the modulation of the ribbon stiffness.
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Inventors:
VERYASKIN ALEXEY (AU)
Application Number:
PCT/GB2010/001282
Publication Date:
January 12, 2012
Filing Date:
July 02, 2010
Export Citation:
Assignee:
GRAVITEC INSTR LTD
VERYASKIN ALEXEY (AU)
TOMLINSON KERRY JOHN (GB)
VERYASKIN ALEXEY (AU)
TOMLINSON KERRY JOHN (GB)
International Classes:
G01V7/00
Domestic Patent References:
| WO2003027715A1 | 2003-04-03 | |||
| WO1996010759A1 | 1996-04-11 |
Foreign References:
| US20020152810A1 | 2002-10-24 |
Attorney, Agent or Firm:
DEHNS (10 Salisbury Square, London EC4Y 8JD, GB)
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