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Spatial magnetic gradient tensor measurement system based on optical fiber magnetic field sensor and working method thereof

A magnetic gradient tensor, magnetic field sensor technology, applied in magnetic gradient measurement, magnetic field measurement using magneto-optical equipment, magnetic field size/direction, etc. question

Active Publication Date: 2020-12-01
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the full tensor magnetic gradiometer with high measurement accuracy is composed of low-temperature superconducting quantum interferometer, but it is not suitable for general application because of its large size, high cost and strict working temperature requirements.

Method used

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  • Spatial magnetic gradient tensor measurement system based on optical fiber magnetic field sensor and working method thereof
  • Spatial magnetic gradient tensor measurement system based on optical fiber magnetic field sensor and working method thereof
  • Spatial magnetic gradient tensor measurement system based on optical fiber magnetic field sensor and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A spatial magnetic gradient tensor measurement system based on a fiber optic magnetic field sensor, such as figure 1 As shown, it includes an external feedback compensation unit 1, an internal optical fiber magnetic sensing unit and a fixed component unit of the overall structure;

[0069] The internal optical fiber magnetic sensing unit is fixedly arranged in the external feedback compensation unit 1 through the integral structure fixed component unit, and the external feedback compensation unit 1 is also stably arranged through the integral structure fixed component unit;

[0070] The external feedback compensation unit 1 is a spherical structure with coils wound on the surface; the existing magnetic field feedback ball is used, and the surface of the spherical non-conductive material is engraved with three directions parallel to the Cartesian coordinate system and perpendicularly intersecting with equal width, different depth, and equal spacing. The enameled wire win...

Embodiment 2

[0081] According to a kind of spatial magnetic gradient tensor measurement system based on the optical fiber magnetic field sensor described in embodiment 1, its difference is:

[0082] The center distance between the two modulation sensing structures 4 on each magnetic sensing fiber 3 is equal, and the center distance between the two modulation sensing structures 4 on each magnetic sensing fiber 3 is 2 times of sensing structure 4. Because the size of the distance is used when calculating the gradient value, and according to the concept of the gradient, when the distance is smaller, the gradient value will be closer to the exact value at the origin, but the design of the mechanical structure needs to be considered at the same time. Therefore, it is necessary to satisfy the installation It is best to take as small a distance as possible while meeting the requirements. The external feedback compensation unit 1 needs to be designed according to the requirement of containing all...

Embodiment 3

[0084] According to a kind of spatial magnetic gradient tensor measurement system based on the optical fiber magnetic field sensor described in embodiment 2, its difference is:

[0085] The fixed component unit of the overall structure includes a concave base 7, several screws 6, and several nuts 5; the bottom of the external feedback compensation unit 1 is fixed on the concave base 7 through several screws 6 and nuts 5, and three optical fiber fixed circular plates 2 Through several screw rods 6 to penetrate and fix the positions of the three optical fiber fixed circular plates 2 with nuts 5 , several screw rods 6 protrude from the top opening of the external feedback compensation unit 1 and fasten with nuts 5 .

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Abstract

The invention relates to a spatial magnetic gradient tensor measurement system based on an optical fiber magnetic field sensor and a working method thereof. The spatial magnetic gradient tensor measurement system comprises an external feedback compensation unit, an internal optical fiber magnetic sensing unit and an integral structure fixing part unit; the internal optical fiber magnetic sensing unit comprises a plurality of magnetic sensing optical fibers, a modulation sensing structure and three optical fiber fixing circular plates; the plurality of magnetic sensing optical fibers are distributed and fixed on the three optical fiber fixing circular plates; two modulation sensing structures are arranged on each magnetic sensing optical fiber; and modulation of the modulation sensing structures is achieved by winding modulation coils on the peripheries, two different modulation frequencies are applied to the two modulation sensing structures, and magnetic induction intensity information measured at two different positions is obtained near the different modulation frequencies of an output spectrum. The system has high magnetic measurement sensitivity, can effectively shield externalelectromagnetic interference, is convenient to be integrated with structures such as a small pressure-bearing cabin for installation and test due to the light design, and is suitable for magnetic field detection in a complex physical environment.

Description

technical field [0001] The invention relates to a space magnetic gradient tensor measurement system based on an optical fiber magnetic field sensor and a working method thereof, belonging to the technical field of optical fiber sensing. Background technique [0002] With the continuous development of magnetic measurement technology, the continuous optimization of magnetic measurement sensors has far-reaching significance in the fields of space magnetic detection, military industry, electric power, and medical treatment. Magnetic detection greatly facilitates people's life, production and scientific research. [0003] The traditional magnetic field sensor uses electronic components to convert the magnetic field into an electric field, and the electric signal is susceptible to electromagnetic interference, and the transmission efficiency is not high. Magnetometers such as fluxgates, magnetoresistive effects, and optical pumps mostly have shortcomings such as large volume, com...

Claims

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Application Information

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IPC IPC(8): G01R33/022G01R33/032
CPCG01R33/022G01R33/032
Inventor 亓夫军尤浩李予国薛庆生刘惠萍
Owner OCEAN UNIV OF CHINA
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