A kind of optical fiber magnetic field sensor and preparation method thereof

A magnetic field sensor and optical fiber technology, applied in the direction of the size/direction of the magnetic field, using magneto-optical equipment for magnetic field measurement, instruments, etc., can solve the problems of insufficient sensitivity of the fiber grating magnetic field sensor

Active Publication Date: 2021-01-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] For the defects of the prior art, the purpose of the present invention is to solve the technical problem of insufficient sensitivity of the fiber grating magnetic field sensor

Method used

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  • A kind of optical fiber magnetic field sensor and preparation method thereof
  • A kind of optical fiber magnetic field sensor and preparation method thereof
  • A kind of optical fiber magnetic field sensor and preparation method thereof

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preparation example Construction

[0042] The preparation process of micro-nano-diamond particles is very mature. By detonating block diamond samples containing nitrogen-vacancy centers, micro-nano-scale diamond particles or micro-columns can be obtained, and nano-diamond particles without nitrogen-vacancy centers can also be obtained. The sample is ion-implanted to form nitrogen-vacancy centers.

[0043] The optical fiber can be a single-mode optical fiber or a multi-mode optical fiber. The diameter of the single-mode optical fiber is generally about 10 microns, and the diameter of the multi-mode optical fiber is 50 microns-100 microns. Single-mode fiber is recommended.

[0044] Implant and fix diamond micropillars or micro-nano diamond particles from one end of the optical fiber, and apply microwaves at the detection end, and then irradiate a laser with a specific wavelength (usually 532nm) from the other end, and collect nitrogen- Fluorescence emitted by the vacancy center can then be measured.

[0045] In...

Embodiment 1

[0048] Diamond microcolumns with a height of 10 microns and a diameter of 4 microns are prepared into an aqueous solution. The concentration of the aqueous solution can be adjusted according to needs. In order to ensure the preparation efficiency, the concentration can be configured to contain an average of 0.01 to 10 diamond microcolumns per cubic micron. The average diameter and length of the diamond microcolumn need to be less than the diameter of the fiber core used. In this embodiment, a single-mode fiber with a core diameter of 8 microns is selected, and one end of the fiber is immersed in the configured microcolumn solution, and the instrument is used from the other end. Or the device pumps out 0.1μL-1μL of gas, and the solution will be sucked into the optical fiber. Take the optical fiber out of the solution and dry it.

[0049] From the other end of the fiber, the 532nm laser light emitted by the laser is coupled into the fiber through the objective lens, and the fluo...

Embodiment 2

[0054] Place diamond microcolumn powder with a height of 10 microns and a diameter of 4 microns in a beaker, place one end of a single-mode optical fiber with a core diameter of 8 microns close to the surface of the powder, and use instruments or equipment to pump out 0.1 μL-1 μL of gas from the other end.

[0055] Implantation detection: refer to Figure 5 or Image 6 , Figure 5 Schematic diagram of the coupling diamond microcolumn or micro-nano diamond particles and optical fiber structure provided by the present invention, and realizing magnetic field measurement through microwave wires; Image 6 In order to couple the structure of diamond micropillars or micro-nano diamond particles and the optical fiber whose surface is etched with microwave wires, the microwave wires on the surface of the optical fiber are used to realize the magnetic field measurement, and the microwave waveguide can be implanted in the coating layer of the optical fiber to apply microwaves to the opt...

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Abstract

The invention discloses an optical fiber magnetic field sensor and a preparation method thereof. The optical fiber magnetic field sensor comprises an optical fiber and a plurality of diamond micro-columns, the plurality of diamond micro-columns are positioned at one end in the optical fiber; each diamond micro-column contains a nitrogen-vacancy center; when the optical fiber magnetic field sensoris used for measuring a magnetic field, one end, containing the diamond micro-column, of the optical fiber is placed in an environment of the magnetic field to be measured, and laser with a preset wavelength is emitted from the other end of the optical fiber, so that the the nitrogen-vacancy center is excited to emit fluorescence; and steps of transmitting a sweep frequency signal in a preset frequency range to one end, containing the diamond micro-column, of the optical fiber, collecting fluorescence, and determining the size of the magnetic field to be measured by analyzing the change rule of the intensity of the fluorescence along with the frequency of the sweep frequency signal are carried out. According to the invention, more nitrogen-vacancy centers can be integrated at an optical fiber port, the sensitivity is related to the number of the nitrogen-vacancy centers in the sample, and a magnetometer with higher sensitivity can be obtained through the diamond micro-column sample with higher nitrogen-vacancy center color center density.

Description

technical field [0001] The invention relates to the technical field of weak signal detection, and more specifically, to an optical fiber magnetic field sensor and a preparation method thereof. Background technique [0002] High-precision weak magnetic measurement technology is an important part of modern detection technology. High-precision weak magnetic detection technology is widely used in aerial exploration, ocean monitoring, detection of groundwater and underwater ferromagnetic substances, earthquake prediction, and geomagnetic matching navigation. , precision non-destructive monitoring of aviation equipment and medical nuclear magnetic resonance monitoring and other fields. [0003] There are many solutions for magnetic detection sensors using optical fibers, including fiber optic magnetic field sensors based on Mach-Zehnder interferometers, fiber optic magnetic field sensors based on Michelson interferometers, fiber optic magnetic field sensors based on Fabry-Perot in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/032
CPCG01R33/0327
Inventor 龚牧桑杨朋成余民蔡建明
Owner HUAZHONG UNIV OF SCI & TECH
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