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Gravity gradiometer

A technology of gravity gradient and gravity field, which is applied in the direction of instruments, scientific instruments, and gravitational field measurement, and can solve problems such as easy deformation of strings

Inactive Publication Date: 2011-12-28
格雷维泰克仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the string is still easily deformed into its "W" mode of oscillation (at Figure 10c shown in ), this mode is the linear sum of all remaining symmetric mode deflections
Although the deflection in this "W" mode is of smaller magnitude than the total deflection due to all symmetric modes of the unconstrained string, there is still a significant source of noise that can limit the operational sensitivity of the device to gravity gradient signals

Method used

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Embodiment Construction

[0079] figure 1 A gravity gradiometer 1 according to a first embodiment of the invention is shown, in which the sensing element is provided by an elongated strip 3 whose width and thickness are much smaller than its length. exist Figure 2a The strip 3 arranged in the apparatus 1 is shown in detail in the undisturbed state (ie rest position).

[0080] The strip 3 has a length L, on the order of tens of centimeters, and a width W, which is greater than its thickness D, so that the strip 3 resembles a line strip (ie L>>W>D). The shape of this strip indicates that the displacement of strip 3 is limited to the direction perpendicular to its main plane of extension (along the length and width), so the gradiometer is only sensitive to causing strip 3 to move in this direction (this direction is the direction of strip 3). direction with thickness) is force sensitive for movement. The strip 3 is constructed such that it has a relatively thickened middle portion 21 around the midpo...

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Abstract

Apparatus for the measurement of quasi-static gravity gradients comprising: a flexible ribbon held under tension at both ends; sensing means 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; wherein the ribbon has a non- uniform rigidity profile and / or mass profile along its length such that, in use, the displacement response of the ribbon due to the gravitational gradient of the gravitational field is enhanced and / or the displacement response of the ribbon due to the absolute gravitational acceleration of the gravitational field is suppressed.

Description

technical field [0001] The invention relates to an apparatus for directly measuring the components of a gravity gradient tensor, in particular the off-diagonal components of the tensor, and to a method of measuring said tensor components. Background technique [0002] Gravity gradient measurement is the measurement of the gravity gradient field of differential acceleration between two infinitely close space points. Use the secondary tensor T ij Describe the gravity gradient field, namely: [0003] T ij = - ∂ i , j 2 V ( x , y , z ) - - - ( 1 ) [0004] where i, j = (x, y, z), and the scalar V is the gravitational potential of the local...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/00
CPCG01V7/005
Inventor 阿列克谢·韦里亚斯金霍华德·戈尔登韦恩·麦克雷
Owner 格雷维泰克仪器有限公司