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A kind of composite coating magnetic measuring optical fiber and its preparation method

A composite coating and optical fiber technology, which is used in the measurement of magnetic variables, the size/direction of the magnetic field, and the measurement device, etc., can solve the problem of not realizing the accurate measurement of the magnetic field in the monitoring application of superconducting magnets, and improve the measurement accuracy and sensitivity, strain High, low hysteresis effect

Inactive Publication Date: 2021-06-22
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0004] When the fiber optic magnetic field sensor is applied to the monitoring of superconducting magnets at low temperature, it is necessary to respond in time when the magnetic field of the magnet is abnormal, so as to avoid the irreversible damage caused by the quench fault to the superconducting equipment. Accurate measurement of magnetic field under low temperature conditions and monitoring application in superconducting magnets

Method used

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  • A kind of composite coating magnetic measuring optical fiber and its preparation method

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preparation example Construction

[0034] The preparation method of the above-mentioned composite coating magnetic measuring optical fiber comprises the following steps:

[0035] 1. Apply the acrylic resin to the surface of the bare optical fiber by dip coating-ultraviolet curing process, and form an acrylic resin coating with a layer thickness of 10 μm to 200 μm on the surface of the bare optical fiber;

[0036] 2. Iron-gallium alloy powder (Fe-Ga, Fe, Ga mass ratio is 5:1) and indium-bismuth alloy powder (In, Bi mass ratio is 2:1) prepared by gas atomization method with a particle size of 5-80 μm Mix evenly according to the mass ratio of 85-95:15-5, put it into the coating cup after melting at 80°C;

[0037] 3. Pass the optical fiber coated with acrylic resin coating through the coating cup filled with molten metal alloys (Fe-Ga and InBi) prepared in step 2, and coat the metal alloy melt on the surface of the acrylic resin coating. After cooling, the metal The thickness of the alloy coating is 10 μm to 200 μ...

Embodiment 1

[0040] 1. Apply acrylic resin to the surface of the bare optical fiber by dip coating-ultraviolet curing process, and form a polymer coating with a layer thickness of 100 μm on the surface of the bare optical fiber;

[0041] 2. Mix iron-gallium alloy powder (Fe-Ga) and indium-bismuth alloy powder with a particle size of 25 μm prepared by the gas atomization method at a mass ratio of 95:5, and put them into the coating cup after melting at 80°C;

[0042] 3. Pass the optical fiber coated with acrylic resin coating through a coating cup filled with molten metal alloys (Fe-Ga and InBi), coat the metal melt on the surface of the acrylic resin coating, and the thickness of the metal alloy coating after cooling is 100 μm.

Embodiment 2

[0044] 1. Apply acrylic resin to the surface of the bare optical fiber by dip coating-ultraviolet curing process, and form a polymer coating with a layer thickness of 200 μm on the surface of the bare optical fiber;

[0045] 2. Mix iron-gallium alloy powder (Fe-Ga) and indium-bismuth alloy powder with a particle size of 80 μm prepared by the gas atomization method at a mass ratio of 90:10, and put them into the coating cup after melting at 80°C;

[0046] 3. Pass the optical fiber coated with acrylic resin coating through a coating cup filled with molten metal alloys (Fe-Ga and InBi), coat the metal melt on the surface of the acrylic resin coating, and the thickness of the metal alloy coating after cooling is 200 μm.

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Abstract

The invention relates to a composite coating magnetic measuring optical fiber, which comprises a bare optical fiber and a coating layer, and the coating layer is a composite coating layer composed of acrylic resin, iron-gallium alloy and indium-bismuth alloy. The preparation method of the composite coating magnetic measuring optical fiber of the present invention comprises: 1, adopts dip coating-ultraviolet light curing process to apply acrylic resin on the surface of the bare optical fiber, and forms an acrylic resin coating on the surface of the bare optical fiber; 2, the gas Mix the iron-gallium alloy powder and indium-bismuth alloy prepared by the atomization method evenly, and put them into the coating cup after melting at 80°C; 3. Pass the optical fiber coated with the acrylic resin coating through the coating cup prepared in step 2, The surface of the acrylic resin coating is coated with a metal alloy melt, and then cooled to prepare a composite coating magnetic measuring optical fiber. The invention solves the problems of low strain of traditional materials and low sensitivity of the optical fiber magnetic field sensor at low temperature, and significantly improves the measurement accuracy and sensitivity of the magnetic measuring optical fiber at low temperature.

Description

technical field [0001] The invention belongs to the technical field of optical fiber magnetic field sensors for superconducting magnets, and in particular relates to a magnetic measuring optical fiber used for measuring changes in the magnetic field of superconducting magnets at low temperature and a preparation method thereof. Background technique [0002] The magnetic field is an important parameter that reflects the operating state of the superconducting magnet during the operation of superconducting equipment. Through real-time monitoring of the magnetic field, the quench fault of the superconducting magnet can be found in time, which is conducive to the normal operation of the superconducting magnet. However, superconducting magnets are in a complex electromagnetic environment with strong magnetic fields and high currents. Although traditional electrical magnetic field sensors (fluxgate magnetometers, Hall sensors, induction coil magnetometers, giant magnetoresistance ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/00G01R33/032G01R33/10G01R33/12G01R33/18
CPCG01R33/0052G01R33/0327G01R33/10G01R33/1238G01R33/18
Inventor 戴少涛方埼磊张腾莫思铭蔡渊袁文马韬王邦柱胡磊
Owner BEIJING JIAOTONG UNIV
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