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Preparation method of spiral multi-core ytterbium-doped microstructure optical fiber sensor

A technology of micro-structured optical fiber and sensor, which is applied in the direction of converting sensor output, using optical devices to transmit sensing components, and coupling of optical waveguides. It can solve the problems of low sensitivity at small angles, damage to sensor performance, and complexity, and achieve high sensitivity. Effect

Pending Publication Date: 2021-03-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fiber Bragg grating (FBG) based bend sensors have low sensitivity to small angles and usually require an additional reference sensor
Oriented bending sensors based on long-period gratings are highly sensitive, but the surrounding media impairs sensor performance
Interferometric bend sensors, although highly sensitive proposals have been made, they tend to be more complex

Method used

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  • Preparation method of spiral multi-core ytterbium-doped microstructure optical fiber sensor
  • Preparation method of spiral multi-core ytterbium-doped microstructure optical fiber sensor
  • Preparation method of spiral multi-core ytterbium-doped microstructure optical fiber sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the present invention provides a helical multi-core ytterbium-doped microstructure optical fiber sensor, including a light source, a spectrometer and a section of helical multi-core ytterbium-doped microstructure optical fiber; one end of the helical multi-core ytterbium-doped microstructure optical fiber is connected to a single The other end is connected to the single-mode pigtail with FC connector; the single-mode pigtail with PC connector is connected to the light source, and the other single-mode pigtail with FC connector is connected to the spectrometer.

[0038] Specifically, the helical multi-core ytterbium-doped microstructure fiber is a helical three-core ytterbium-doped microstructure fiber.

[0039] Specifically, the helical multi-core ytterbium-doped microstructure fiber structure is the use of CO 2 The laser is focused and heated to cause thermal deformation of the fiber, and the fiber fusion splicer is used to customize the hel...

Embodiment 2

[0042] Such as figure 2 As shown, the present invention provides a helical multi-core ytterbium-doped microstructure fiber sensor, including a spectrometer with its own light source and a section of helical multi-core ytterbium-doped microstructure fiber; one end of the helical multi-core ytterbium-doped microstructure fiber is connected to the The single-mode pigtail is connected to the single-mode pigtail with FC connector; the single-mode pigtail with PC connector is connected to the light source end of the spectrometer, and the other single-mode pigtail with FC connector is connected to the spectrometer output connection.

Embodiment 3

[0044]The invention provides a method for preparing a helical multi-core ytterbium-doped microstructure optical fiber sensor, the specific steps are as follows:

[0045] Step A: Remove the surface coating of a section of multi-core ytterbium-doped microstructure optical fiber with a length of 6 cm, and then wipe the area clean with alcohol;

[0046] Step B: Place the optical fiber obtained in step A on the optical fiber fusion splicer, and fix the two ends of the optical fiber at the corresponding places of the fusion splicer;

[0047] Step C: Select the custom spiral program and start the spiral program;

[0048] Step D: Exit the custom spiral program program, and take out the optical fiber;

[0049] Step E: Cut the 6cm helical multi-core ytterbium-doped microstructure optical fiber obtained in step D into three parts, use a ruby ​​cutter to cut the end faces of the two ends of the fiber flat, and the lengths are 1cm, 2cm, and 3cm respectively;

[0050] Step F: Splicing the...

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Abstract

The invention discloses a preparation method of a spiral multi-core ytterbium-doped microstructure optical fiber sensor, which comprises the following steps of removing the surface coating of a section of multi-core ytterbium-doped microstructure optical fiber, and wiping the area with alcohol, placing the obtained optical fiber on an optical fiber fusion splicer, and fixing the two ends of the optical fiber to the corresponding positions of the fusion splicer, selecting a custom spiral program, and starting the spiral program, exiting the custom spiral program, and taking out the optical fiber, cutting the obtained spiral multi-core ytterbium-doped microstructure optical fiber into three parts, and cutting the end faces of the two ends of the optical fiber flat through a ruby cutting knife, and welding the two ends of the obtained spiral multi-core ytterbium-doped microstructure optical fibers with different lengths with the two single-mode tail fibers. The strong coupling multi-coreoptical fiber is used, and the physical quantity sensitivity of sensing by changing the phase of the multi-core optical fiber interference mode is high. The optical fiber is composed of three Yb<3+>-doped cores, has a regular triangular shape and a longitudinal spiral structure, and can solve the problems of bending and small-angle sensing measurement with high sensitivity.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a method for preparing a helical multi-core ytterbium-doped microstructure optical fiber sensor. Background technique [0002] In the fields of bridges, buildings, large machinery, etc., it is very important to measure structural deformation and internal stress, detect large structures, and evaluate the health of bridges. For this application, the sensitivity of the sensor to bending or stress is extremely high. In addition, the sensors must be compact, simple, accurate and reliable. Therefore, high-sensitivity sensors have great application value in the field of industrial manufacturing. [0003] In recent years, with the advancement of modern intelligent structure detection technology and optical fiber manufacturing technology, micro-optical sensing devices have developed rapidly. Optical fiber sensors use the optical fiber itself as a sensor. Specific external...

Claims

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Application Information

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IPC IPC(8): G01D5/353G02B6/255G02B6/245
CPCG01D5/35306G02B6/255G02B6/245
Inventor 李香卓赵逸飞
Owner SOUTH CHINA NORMAL UNIVERSITY