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Optical fiber magnetorefractive effect measurement system and method

A measurement system and magnetotropic technology, which is applied in the use of magneto-optical equipment for magnetic field measurement, the size/direction of the magnetic field, etc., can solve the problems of high system maintenance costs, difficult sensor production, complex sensing structure, etc., and achieve simple structure , to avoid the effect of complex coating process and high sensitivity

Active Publication Date: 2022-08-05
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of complex sensing structure, difficult sensor fabrication and high system maintenance cost in the magnetic field measurement system based on the magnetostrictive effect, the present invention designs a magnetic field measurement system based on the optical fiber magnetostrictive effect to solve the above disadvantages

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  • Optical fiber magnetorefractive effect measurement system and method
  • Optical fiber magnetorefractive effect measurement system and method
  • Optical fiber magnetorefractive effect measurement system and method

Examples

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Embodiment 1

[0042] In this example, see figure 1 , an optical fiber magnetorefractive effect measurement system, including laser 1, coupler A 2, sensing fiber 3, reference fiber 4, carrier generator 5, coupler B 6, photodetector 7, data acquisition and processing module 8;

[0043] The output port of the laser 1 is connected to the first port 21 of the coupler A 2, the second port 22 of the coupler A 2 is connected to the first port 31 of the sensing fiber 3, and the third port 23 of the coupler A 2 Connect with the first port 41 of the reference fiber 4; the second port 32 of the sensing fiber 3 is connected with the second port 62 of the coupler B 6, and the second port 42 of the reference fiber 4 is connected to the second port 62 of the coupler B 6. The three ports 63 are connected; the first port 61 of the coupler B 6 is connected with the input port of the photodetector 7; the input port of the data acquisition and processing module 8 is connected with the output port of the photod...

Embodiment 2

[0049] This embodiment is basically the same as the first embodiment, and the special features are:

[0050] In this example, see figure 1 , coupler A 2, sensing fiber 3, reference fiber 4, coupler B 6 are connected to form a Mach-Zehnder fiber interferometer, sensing fiber 3 constitutes the sensing arm of the Mach-Zehnder fiber interferometer, and reference fiber 4 constitutes a Mach-Zehnder fiber interferometer. - the reference arm of the Zehnder fiber optic interferometer, the first port 21 of the coupler A 2 is the optical input port of the Mach-Zehnder fiber optic interferometer, and the first port 61 of the coupler B 6 is the optical output port of the Mach-Zehnder fiber optic interferometer .

[0051] In this example, see figure 1 , the system is based on the magnetorefractive effect of the sensing fiber 3, the refractive index of the sensing fiber 3 is modulated by the external magnetic field, causing the optical path difference of the two optical signals in the sens...

Embodiment 3

[0055] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0056] In this example, see figure 1 and figure 2 , a system and method for measuring the optical fiber magnetorefractive effect according to claim 1, comprising the following steps:

[0057] a. The optical signal output by the laser 1 is divided into two beams of light transmitted by the sensing fiber 3 and the reference fiber 4 through the coupler A 2. The two beams of light interfere at the coupler B 6, and the intensity of the interference light signal is determined by the photodetector 7. detection;

[0058] b. During the DC magnetic field measurement, a DC magnetic field is applied to the sensing fiber 3, and the magnetic field changes the refractive index of the sensing fiber 3, causing the optical path difference of the optical signal in the sensing fiber 3 and the reference fiber 4 to change, changing the coupler B 6 The output interference light signal ...

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Abstract

The invention discloses an optical fiber magnetorefractive effect measurement system and method, comprising a laser, a coupler A, a sensing optical fiber, a reference optical fiber, a carrier wave generator, a coupler B, a photoelectric detector, and a data acquisition and processing module. Coupler A, sensing fiber, reference fiber, and coupler B constitute the Mach‑Zehnder fiber interferometer. The external magnetic field affects the refractive index of the sensing fiber, causing the optical path difference between the sensing fiber and the reference fiber to change, and changing the intensity of the interference light signal output by the coupler B. Through the detection and processing of the interference light intensity, Realize the measurement of the refractive index change of the sensing fiber under the action of the magnetic field. The system of the invention has the advantages of high sensitivity, simple structure, remote control and distributed measurement.

Description

technical field [0001] The invention relates to the field of magnetic field measurement, in particular to an optical fiber magnetorefractive effect measurement system and method. Background technique [0002] Magnetic field measurement technology has a very wide range of applications in the field of information industry, and has been used in magnetic mine sweeping, ship degaussing, weapon search, submarine detection and other fields. For example, in the field of submarine detection, stealth technology is widely used in modern submarines, which makes the noise of submarines very low and weakens the potential of sonar detection. Therefore, higher requirements are placed on the sensitivity of magnetic field detectors. High-sensitivity weak magnetic field measurement technology has always been a research hotspot in many countries. [0003] The interferometric optical fiber magnetic field measurement system has the characteristics of high sensitivity, simple structure, remote op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/032
CPCG01R33/032G01D5/35329G01R33/0023
Inventor 王廷云刘思晨黄怿邓传鲁胡程勇
Owner SHANGHAI UNIV
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