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A Method for Measuring Refractive Index of Solution Using Resonance in the Region of Wavelength Greater Than Fiber Core Mode Wavelength

A technology of resonance measurement and refractive index, applied in the measurement of scattering characteristics and phase influence characteristics, etc., can solve the problems of immersion, slow response speed, and difficult to repair in the gate area or microstructure area, achieve a narrow spectral range, and avoid measurement errors. , the effect of improving the service life

Active Publication Date: 2021-03-26
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are still deficiencies in the equipment and methods of using optical fibers to measure the refractive index. For example, when most of the optical fibers are used to measure the refractive index, their grid regions or microstructure regions need to be immersed in the solution to be measured.
Due to the low strength of these areas, it is easy to break during use and difficult to repair, which will cause huge losses
Therefore, some scholars began to use pigtails to measure the refractive index of solutions, but these methods have the disadvantages of wide monitoring range, slow response speed and low sensitivity.

Method used

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  • A Method for Measuring Refractive Index of Solution Using Resonance in the Region of Wavelength Greater Than Fiber Core Mode Wavelength
  • A Method for Measuring Refractive Index of Solution Using Resonance in the Region of Wavelength Greater Than Fiber Core Mode Wavelength
  • A Method for Measuring Refractive Index of Solution Using Resonance in the Region of Wavelength Greater Than Fiber Core Mode Wavelength

Examples

Experimental program
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Effect test

Embodiment 1

[0019] figure 1 The measuring equipment required for this solution refractive index measurement method is as follows: figure 1 , including ASE light source 1, OSA spectrometer 2, beam splitter 3, tilted fiber grating (TFBG) 4, fiber clamp 5, and temperature control platform 6; among them, the beam splitter 3 has two branches, one end of which is connected to ASE light source 1, and the other end is connected to OSA The spectrometer 2; the main road of the optical splitter is connected to one end of the inclined fiber Bragg grating 4, and the tail of the other end of the inclined fiber Bragg grating 4 is cut flat with an optical fiber cutter after removing the coating layer; And place the grid area of ​​the inclined fiber grating 4 in the temperature control platform 6 .

Embodiment 2

[0021] The method of measuring the refractive index of a certain glycerin solution to be measured is measured by using the method of measuring the refractive index of the solution by resonance in the wavelength region larger than the wavelength of the core mode, and the steps are as follows.

[0022] Follow the equipment installation steps to install the equipment. This experiment uses TFBG with an inclination angle of 6°. Set the temperature control table to 20°C, turn on the light source and the spectrometer, and adjust the measurement parameters of the spectrometer. Insert the pigtail into the standard solution, gradually change the refractive index of the standard solution, record the resonance trough intensity in the region where the wavelength is greater than the core mode wavelength, and draw the change curve between the resonance trough intensity and the refractive index of the standard solution as follows: image 3 . From image 3 It can be seen that the sensitivity...

Embodiment 3

[0024] The method of measuring the refractive index of a certain glycerin solution to be measured is measured by using the method of measuring the refractive index of the solution by resonance in the wavelength region larger than the wavelength of the core mode, and the steps are as follows.

[0025] Follow the equipment installation steps to install the equipment. This experiment uses a TFBG with an inclination angle of 8°. Set the temperature control table to 20°C, turn on the light source and the spectrometer, and adjust the measurement parameters of the spectrometer. Insert the pigtail into the standard solution, gradually change the refractive index of the standard solution, record the resonance trough intensity in the region where the wavelength is greater than the wavelength of the fiber core mode, and draw the change curve of the resonance trough intensity and the refractive index of the standard solution. The pigtail was inserted into the solution to be tested, and th...

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Abstract

The invention discloses a method for measuring a refractive index of a solution by utilizing intraregional resonance having a wavelength larger than a core mode wavelength. The method comprises the following steps: a) building a measuring apparatus; b) opening a temperature control table, setting the temperature as 20 DEG C, opening a light source and a spectrograph, and regulating measured parameters of the spectrograph; c) inserting inclined fiber Bragg grating tail fibers into a standard solution; d) gradually changing the refractive index of a standard solution, recording trough intensityof intraregional resonance having the wavelength larger than the core mode wavelength, and drawing a changing curve of the resonant trough intensity and the refractive index of the standard solution;d) by utilizing the changing curve of the resonant trough intensity and the refractive index of the standard solution, calculating the refractive index of a to-be-measured solution by measuring the resonant trough intensity of the to-be-measured solution. According to the method disclosed by the invention, the service life of the measuring apparatus can be greatly prolonged, and the data reliability is improved; the method is convenient and flexible to operate and has high environmental suitability; the spectral range needing to be acquired is narrow, the response is fast, and the sensitivityand resolution are high.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a method for measuring the refractive index of a solution. Background technique [0002] Refractive index measurement is of great significance in the fields of biochemistry, environmental detection, and life sciences. Therefore, researchers have conducted a lot of research on refractive index measurement equipment and methods. Among them, optical fibers have attracted extensive research interest due to their advantages such as small size, wide bandwidth, immunity to light intensity changes, electromagnetic interference, and corrosion resistance. [0003] At present, there are still deficiencies in the equipment and methods for measuring the refractive index by using optical fibers. For example, when most of the optical fibers are used to measure the refractive index, their grid regions or microstructure regions need to be immersed in the solution to be measured. Du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G01N21/55
CPCG01N21/41G01N21/55
Inventor 李玉龙杨泓李学文胡小武
Owner NANCHANG UNIV