A spatial magnetic gradient tensor measurement system based on an optical fiber magnetic field sensor and its working method

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. problem, to achieve the effect of low production cost, easy to set up measurement network, and small size

Active Publication Date: 2021-10-15
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A spatial magnetic gradient tensor measurement system based on an optical fiber magnetic field sensor and its working method
  • A spatial magnetic gradient tensor measurement system based on an optical fiber magnetic field sensor and its working method
  • A spatial magnetic gradient tensor measurement system based on an optical fiber magnetic field sensor and its working method

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, comprising an external feedback compensation unit, an internal optical fiber magnetic sensing unit and an overall structural fixed component unit; the internal optical fiber magnetic sensing unit includes several Magnetic sensing optical fiber, modulation sensing structure, three optical fiber fixing circular plates, several magnetic sensing optical fibers are arranged and fixed on three optical fiber fixing circular plates, and each magnetic sensing optical fiber is provided with two modulation sensing optical fibers. The modulation of the modulation sensing structure is achieved by winding the modulation coil around the periphery, applying two different modulation frequencies to the two modulation sensing structures, and obtaining two different positions measured near the different modulation frequencies of the output spectrum Magnetic induction information. While having high magnetic detection sensitivity, the present invention can effectively shield external electromagnetic interference, and its lightweight design is convenient for integration, installation and testing with structures such as small pressurized cabins, and is suitable for magnetic field detection in complex physical environments.

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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Patent Type & Authority Patents(China)
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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