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A Method of Improving Sensitivity and Detection Range of Optical Fiber Fab Sensor

A Fab sensor and sensitivity technology, which is applied in the field of improving the sensitivity and detection range of the fiber optic Fab sensor, and can solve the problem of the difficulty in precisely adjusting the sensitivity of the fiber optic Fab sensor, the difficulty in accurately controlling the thickness of the film, and the inability to measure the refractive index, etc. problems, to achieve the effects of fast and accurate detection range, saving film-making time, and improving modulation efficiency

Active Publication Date: 2016-08-10
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

[0010] Gong Yuan, Guo Yu, Rao Yunjiang, Zhao Tian, ​​Wu Yu, Ran Zengling. Sensitivity Analysis of Optical Fiber Fabry-Perot Composite Refractive Index Sensor[J]. Acta Physica Sinica, 2011, 60(6): 298-303.), This method is to immerse the sensing head of the optical fiber Fab sensor into the medium to be measured, and use the fringe contrast of the reflection spectrum to measure the refractive index. This type of sensor is relatively simple to manufacture and measure. But there are also some disadvantages: (1) The sensitivity is not good High enough; (2) The linear range is generally narrow, and a wide range of refractive index measurements cannot be achieved
[0011] In our previous research, we assembled PDDA / PSS polymer film on the end face of the sensor head of the optical fiber Fab sensor through the electrostatic layer-by-layer self-assembly technology, but the sensitivity change was not large, and this technology was very time-consuming. The thickness of one layer is only a few nanometers or tens of nanometers, and in order to adjust the sensitivity of the fiber optic Fab sensor, it is usually necessary to assemble dozens or hundreds of layers of thin film on its end face, which takes several days to complete
[0012] We also try to directly dip-coat the sol-gel solution of metal oxide on the end face. Although this method can quickly change the refractive index sensitivity of the optical fiber Fab sensor, however, it is difficult to precisely control the thickness of the film in this method, and it is difficult to Precisely adjust the sensitivity of fiber-optic F-P sensor

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  • A Method of Improving Sensitivity and Detection Range of Optical Fiber Fab Sensor
  • A Method of Improving Sensitivity and Detection Range of Optical Fiber Fab Sensor
  • A Method of Improving Sensitivity and Detection Range of Optical Fiber Fab Sensor

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example 1

[0038] Example 1: Under the condition of constant temperature water bath at 60°C, impregnate the optical fiber Fab sensor in 0.04mol / L titanium tetrafluoride TiF 4 In aqueous solution, TiF 4 In aqueous solution, hydrolysis coordination exchange equilibrium reaction occurs according to formula (1):

[0039]

[0040] Since HF is a volatile gas, with the volatilization of HF, the equilibrium reaction in (1) moves to the right, and finally precipitates the titanium dioxide film closely combined with the end face of the fiber optic sensor.

[0041] When the reaction time at this temperature reaches 240 minutes, the fringe contrast of the optical fiber Fab sensor to this solution reaches the maximum, see Figure 7 . Its thickness varies with time as Figure 8

example 2

[0042] Example 2: In a 90°C constant temperature water bath, the optical fiber Fab sensor is immersed in 0.01mol / L titanium tetrachloride TiCl 4 In aqueous solution, TiCl 4 In aqueous solution, hydrolysis coordination exchange equilibrium reaction occurs according to formula (1):

[0043]

[0044] Since HCl is a volatile gas, with the volatilization of HCl, the equilibrium reaction in (1) moves to the right, and finally precipitates the titanium dioxide film closely combined with the end face of the fiber optic sensor.

[0045] The reaction time at this temperature is only 60 minutes, and the fringe contrast of the fiber optic sensor can reach the maximum for this solution, such as Figure 9 . Its thickness varies as Figure 10

example 3

[0046] Example three: 1. At 25°C, prepare 0.1mol / L (NH4) 2TiF6 in aqueous solution, [TiF 6 ] 2- In aqueous solution, hydrolysis coordination exchange equilibrium reaction occurs according to formula (1):

[0047]

[0048] 2. Then add F- ion trapping agent H3BO3, make the concentration of H3BO3 0.3mol / L, stir evenly, and adjust the pH of the solution to 3.9, H3BO3 and F- form a stable complex BF4-, according to the formula (2) Move the equilibrium reaction to the right, and accelerate the coordination exchange reaction formula (1) due to the consumption of non-coordinated F- ions, resulting in

[0049] 3. Immerse the end face of the optical fiber of the fiber optic sensor in the prepared solution, the fiber end face of the fiber sensor -OH and and Dehydration and condensation reactions are carried out between them, and finally a titanium dioxide film closely combined with the end face of the optical fiber is precipitated.

[0050] 4. Control the reaction time and t...

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Abstract

The invention provides a method of improving sensitivity and broadening the detection range of an optical fiber Fabry-Perot sensor. An end face of the optical fiber Fabry-Perot sensor is modified with titanium dioxide nanometer film, thus improving the sensitivity and broadening the detection range of the refractive index of the optical fiber Fabry-Perot sensor. In addition, the titanium dioxide nanometer film can be prepared under room temperature conditions with simple operation and without the need of expensive instruments and apparatuses, thus largely shortening the time and reducing the cost for adjusting the sensitivity of the optical fiber Fabry-Perot sensor. The method can provide reliable basis for detection of the refractive index, and has important functions for biochemical analysis and other refractive index analysis.

Description

technical field [0001] The invention relates to a method for improving the sensitivity and detection range of an optical fiber Fab sensor in the detection of refractive index. Background technique [0002] In recent years, with the rapid development of industrial and agricultural modernization and national defense science and technology, people have put forward new urgent needs for analytical and testing methods in the fields of biomedical screening, chemical industry, environmental analysis, food safety testing, national defense security testing and protection. Optical fiber refractive index sensors are widely used due to their advantages such as low cost, easy fabrication, small size, anti-electromagnetic interference, low energy loss during transmission, acid and alkali corrosion resistance, high performance reliability, easy networking, and remote control. Widespread concern. Optical fiber refractive index sensors mainly include Mach-Zehnder interferometers, Bragg grati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41
Inventor 李秋顺史建国马耀宏姜明顺郑晖孙士青李雪梅陈燕
Owner BIOLOGY INST OF SHANDONG ACAD OF SCI