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Gravity gradient detection method based on Sagnac effect angular accelerometer

An angular accelerometer and gravitational gradient technology, applied in measurement devices, gravitational field measurement, geophysical measurement, etc., can solve problems such as few innovations in principle, limited accuracy, and high requirements for linear accelerometer consistency.

Active Publication Date: 2021-01-15
PEKING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, for a long time, the accuracy of the gravity gradiometer has been limited by the principle, engineering level, noise and other reasons, and it has been difficult to improve; and most of the gravity gradients are obtained based on linear acceleration or translational motion measurement. accelerometer to measure the gravity gradient component Γ xx -Γ yy , Γ xy , which has higher requirements on the consistency of the linear accelerometer

Method used

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  • Gravity gradient detection method based on Sagnac effect angular accelerometer
  • Gravity gradient detection method based on Sagnac effect angular accelerometer
  • Gravity gradient detection method based on Sagnac effect angular accelerometer

Examples

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Embodiment Construction

[0080] as attached figure 1 As shown, two identical high-density (such as tungsten-nickel-copper alloy) uniform balls are supported on a disc or other supporting surface by light rods or reeds (which can be made of aluminum alloy), and the light rods are driven by motors or other equipment. Rotate at a certain angular velocity around a vertical axis with constant power. Fix the fiber optic ring with light rod or reed so that the fiber optic angular accelerometer is fixed on the attached figure 1 shown on the gravity gradient detection device. To follow the attached image 3 shown in the differential mode implementation, refer to the attached figure 1 Similar execution is sufficient, stick A and stick B need to follow the attached figure 1 A fiber optic angular accelerometer is fixed in the same way.

[0081] The optical topology of the fiber optic angular accelerometer is attached Figure 5 As shown, the light source can use SLD or ASE light source, and also includes lig...

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Abstract

The invention discloses a gravity gradient detection method based on a Sagnac effect angular accelerometer, and the method comprises the steps: 1) fixing one or two orthogonal rod mass block structures on a supporting surface, enabling a rod mass block to comprise two mass blocks with the same mass and a connecting rod of the two mass blocks, and fixing an optical fiber angular accelerometer on the rod mass block; 2) driving the supporting surface to rotate at a constant angular speed, and measuring the rotation angular acceleration of the rod; 3) resolving a gravity gradient component. According to the invention, the consistency requirement of the gravity gradient measurement unit can be reduced, the gravity gradient detection signal-to-noise ratio is improved, and the gravity gradient full-tensor measurement is realized.

Description

technical field [0001] The invention relates to a gravity gradient detection method based on a Sagnac effect angular accelerometer. It is suitable for engineering and scientific research fields such as mineral resource development, geological and geophysical exploration, geothermal field monitoring, geological disaster warning, deep earth structure research, oceanography and climatology, and inertial navigation. Background technique [0002] The earth's gravitational field is a basic geophysical field, and the gravity gradient is the second derivative of the potential function ψ of the earth's gravitational field, which can sensitively reflect the density inhomogeneity of the subsurface. In the Cartesian coordinate system, there are nine gravity gradient components in total, and these components form a gradient tensor Γ, whose expression is: [0003] [0004] In the tensor shown in formula (1), each component represents a gravity gradient. Specifically, remember g x , ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/00
CPCG01V7/00
Inventor 陈彦钧曾卫益李正斌
Owner PEKING UNIV
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