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Gravity gradient detection method based on sagnac effect angular accelerometer

An angular accelerometer and gravitational gradient technology, which is used in measurement devices, gravitational field measurement, geophysical measurement, etc., can solve the problems of high consistency requirements of linear accelerometers, few innovations in principles, and difficulty in upgrading, so as to reduce the surrounding area. Influence of environmental interference, elimination of environmental common mode noise, effect of reducing requirements

Active Publication Date: 2021-11-09
PEKING UNIV
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  • Abstract
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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

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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. The detection method of the invention is as follows: 1) fixing one or two orthogonal rod-mass structures on the support surface, the rod-mass structure Including two quality blocks with equal mass and connecting rods thereof, a fiber optic angular accelerometer is fixed on the rod-mass block; 2) driving the supporting surface to rotate at a constant angular velocity, and measuring the rotational angular acceleration of the rod; 3) Solve for the gravity gradient component. The invention can reduce the consistency requirement of the gravity gradient measurement unit, improve the signal-to-noise ratio of the gravity gradient detection, and realize the full tensor measurement of the gravity gradient.

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 Patents(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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