System and method for measuring magnetic refraction effect of optical fiber

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

Active Publication Date: 2021-10-19
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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  • System and method for measuring magnetic refraction effect of optical fiber
  • System and method for measuring magnetic refraction effect of optical fiber
  • System and method for measuring magnetic refraction effect of optical fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In this example, see figure 1 , a fiber optic magnetoresistive effect measurement system, including a laser 1, a coupler A 2, a sensing fiber 3, a reference fiber 4, a carrier generator 5, a coupler B 6, a photodetector 7, and a 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 with the second port 62 of the coupler B 6 Three ports 63 are connected; the first port 61 of the coupler second 6 is connected with the input port of the photodetector 7; the input port of the data collection and processing module 8 is connected with the output p...

Embodiment 2

[0049] This embodiment is basically the same as Embodiment 1, especially in that:

[0050] In this example, see figure 1 , coupler A 2, sensing fiber 3, reference fiber 4, and 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 the Mach-Zehnder fiber interferometer -The reference arm of the Zehnder fiber interferometer, the first port 21 of the coupler A 2 is the optical input port of the Mach-Zehnder fiber interferometer, and the first port 61 of the coupler B 6 is the light output port of the Mach-Zehnder fiber 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 an external magnetic field, which causes the optical path difference of the two optical signals in the sensing fiber 3 and the reference ...

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 optical fiber magnetoresistive 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, and the two beams of light interfere at the coupler B 6, and the intensity of the interference light signal is detected by the photodetector 7 detection;

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

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Abstract

The invention discloses a system and a method for measuring a magnetic refraction effect of an optical fiber. The system comprises a laser, a coupler A, a sensing optical fiber, a reference optical fiber, a carrier generator, a coupler B, a photoelectric detector and a data acquisition and processing module. And the coupler A, the sensing optical fiber, the reference optical fiber and the coupler B form a Mach-Zehnder optical fiber interferometer. An external magnetic field influences the refractive index of the sensing optical fiber, the optical path difference between two paths of optical signals of the sensing optical fiber and the reference optical fiber is changed, the intensity of interference optical signals output by the coupler B is changed, and the refractive index change of the sensing optical fiber under the action of the magnetic field is measured by detecting and processing the interference optical intensity. The system 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 a system and method for measuring optical fiber magneto-refractive effect. 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 minesweeping, ship degaussing, search weapons, 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 detection energy of sonar. Therefore, higher requirements are placed on the sensitivity of magnetic field detectors. High-sensitivity weak magnetic field measurement technology has 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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