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A method of polymethacrylic acid regulating the sensitivity of lpfg

A polymethacrylic acid and methacrylic acid technology, which is applied in the measurement of phase influence characteristics, instruments, optical waveguides and light guides, etc., can solve the problem of low response sensitivity of low-refractive index media, and achieve the effect of stable growth of thin films.

Active Publication Date: 2022-07-15
BIOLOGY INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, in order to solve the shortcoming that LPFG has low response sensitivity to low refractive index media, the present invention provides a method for regulating the sensitivity of LPFG by polymethacrylic acid

Method used

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  • A method of polymethacrylic acid regulating the sensitivity of lpfg

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Experimental program
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Effect test

Embodiment 1

[0038] 5 ml of dimethyl sulfoxide mixed solution was prepared with 0.86 g of 2-methacrylic acid, 1.98 g of polyethylene glycol dimethacrylate and 0.2 g of 2,2'-azobisisobutyronitrile, and stirred evenly. The solution was poured into the liquid reaction tank where the long period grating was fixed, the reaction temperature was adjusted to 50 °C, the reaction time was controlled, and the reaction was stopped when the sensitivity of the long period grating to the refractive index reached the required requirements, and fully rinsed with double distilled water.

Embodiment 2

[0040] 0.06 mol of 2-methacrylic acid and 0.04 mol of polyethylene glycol dimethacrylate were prepared into 10 ml of tetrahydrofuran solution, then 0.001 mol of 2,2'-azobisisobutyronitrile was added, and after stirring evenly, the The prepared solution is poured into the liquid reaction tank of the fixed long period grating, the reaction temperature is adjusted to 60°C, the reaction time is controlled, and the reaction is stopped when the sensitivity of the long period grating to the refractive index reaches the required requirements, and fully rinsed with double distilled water. .

Embodiment 3

[0042] Mix 3.44g 2-methacrylic acid and 3.96g polyethylene glycol dimethacrylate into 5ml dimethyl sulfoxide solution, mix the two solutions, and then add 0.3g 2,2'-azodiiso Nitrile, stir to mix well. Pour the prepared solution into the reaction cell of the fixed long period grating, adjust the temperature of the solution to 80 °C, control the reaction time, and stop the reaction when the sensitivity of the long period grating to the refractive index reaches the required requirements, and use two Rinse thoroughly with distilled water.

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Abstract

The invention discloses a method for adjusting the sensitivity of LPFG by polymethacrylic acid. By controlling the concentration of reaction reagents, reaction time and reaction temperature, the thickness of polymethacrylic acid nano-film on the surface of LPFG is controlled, so as to precisely control the effect of LPFG on different refractive indices. The sensitive range of LPFG can be achieved to achieve high sensitivity regulation of LPFG to different refractive indices. The invention does not need expensive instruments and equipment, has simple and convenient operation process, and is expected to be widely used in the field of LPFG detection of biochemical molecules.

Description

technical field [0001] The invention relates to the technical field of long-period grating detection, and more particularly to a method for adjusting the sensitivity of LPFG by polymethacrylic acid. Background technique [0002] Long period fiber grating (LPFG) is a kind of passive optical sensor device with sensitive performance to the refractive index of the environment. It has been tried to measure the refractive index of liquid. LPFG has a high refractive index. sensitivity. However, the bare long period grating usually only has high sensitivity to the ambient refractive index in the range of 1.4000-1.453, while the sensitivity to the ambient medium with the refractive index lower than 1.4 is very low. Since the refractive index of most of the tested environmental media is between 1.0 and 1.4 (for example, the refractive index of aqueous solution is around 1.333), the inherent defect of bare LPFG greatly limits its practical application. [0003] In recent years, vario...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G01N21/41
CPCG02B6/02123G02B6/02076G01N21/41
Inventor 李秋顺杨艳马耀宏杨俊慧蔡雷孟庆军刘庆艾王丙莲李大海
Owner BIOLOGY INST OF SHANDONG ACAD OF SCI
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