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Optical fiber Bragg grating refractive index sensor

A refractive index sensor and optical fiber Bragg technology, which is applied in the direction of phase influence characteristic measurement, etc., can solve the problems of affecting the application of the sensor, weakening the strength, increasing the cost, etc., and achieve the effect of simple structure, reducing influence and eliminating measurement error

Inactive Publication Date: 2010-12-29
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that because the cladding of the optical fiber is removed, the bearable strength is weakened, which affects the application of the sensor, and the cost increases at the same time

Method used

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  • Optical fiber Bragg grating refractive index sensor
  • Optical fiber Bragg grating refractive index sensor
  • Optical fiber Bragg grating refractive index sensor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051] In an example, the optical fiber sensor of the present invention is used to measure the reflectance spectrograms of different refractive index solutions, such as Figure 4 As shown, the curves a, b, c and d in the figure correspond to the results of placing the optical fiber sensing head in air, pure water, 12% by mass sucrose solution and 24% by mass sucrose solution, respectively. from Figure 4 It can be seen that the side mode suppression ratio of the fiber Bragg grating increases with the increase of the refractive index of the solution where the fiber sensing head is placed.

[0052] Table 1 is a table showing the relationship between the fiber Bragg grating side mode suppression ratio and the refractive index of the same liquid (sucrose solution) with different mass percentage concentrations.

[0053] Table 1

[0054] Concentration of sucrose solution (%)

[0055] exist Figure 5 Among them are the data results and linear fitting curves of the measur...

example 2

[0057] In this example, the sensor of the present invention has been used to measure the variation of 15% mass percent sucrose solution with temperature, such as Figure 6 As shown, the temperature of the sucrose solution is 30 o C and 60 o The sensor reflection spectrum of C shows that the Bragg wavelength of the fiber Bragg grating moves to the long wave direction with the increase of temperature, and its side mode suppression ratio remains unchanged (the refractive index of sucrose solution does not change significantly with temperature).

[0058] Table 2 is a table showing the relationship between the Bragg wavelength of the fiber Bragg grating and the temperature.

[0059] Table 2

[0060] temperature / o C

Bragg wavelength / nm

1536.40

35

1536.44

40

1536.50

45

1536.55

50

1536.60

55

1536.64

60

1536.69

[0061] exist Figure 7 In the middle, it is the data result and linear fitting curv...

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Abstract

The invention discloses an optical fiber Bragg grating refractive index sensor which comprises a broadband light source (1), an optical fiber coupler (2), a transmission optical fiber (3), an optical fiber sensing head (4) and a spectrograph (5), wherein the broadband light source (1) is connected to an input end of the optical fiber coupler (2), one output end of the optical fiber coupler (2) is connected with the optical fiber sensing head (4) through the transmission optical fiber (3), and the other output end of the optical fiber coupler (2) is connected with the spectrograph (5); light reflected by the optical fiber sensing head (4) is transmitted to the spectrograph (5) through the optical fiber coupler (2), and the spectrograph (5) is communicated with a computer (6); and the optical fiber sensing head (4) is a common optical fiber Bragg grating with a tail fiber. The sensor can be used for measuring refractive indexes and simultaneously measuring the refractive indexes and temperature, and has the advantages of real-time online and remoter detection capability, large measurement range, high sensitivity, strong stability and convenient operation.

Description

technical field [0001] The invention relates to a refraction index sensor, in particular to a refraction index sensor of an optical fiber Bragg grating. Background technique [0002] Refractive index is a very important parameter in the fields of physics, biology, chemistry and other disciplines, and its accurate measurement is of great significance and application in chemical industry, medicine, food and other related industrial sectors. Therefore, many methods for measuring the refractive index have emerged. Traditional measurement methods include grazing incidence, diffraction grating, laser irradiation and CCD measurement, as well as broadband absorption spectroscopy, titration and fluorescence quenching, but most of these methods are limited to the visible light range and are all It is a sampling method and cannot be monitored in real time. Subsequently, some new technologies such as photoacoustics, SPR sensors, and Raman spectroscopy have emerged, but these methods a...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 蒙红云黄旭光
Owner SOUTH CHINA NORMAL UNIVERSITY
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