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A pm based on hollow-core bragg fiber 2.5 Concentration detection device

A technology of concentration detection and optical fiber, which is applied in the field of hollow-core Bragg optical fiber fine particle concentration detection device, can solve the problems of being susceptible to environmental temperature and humidity fluctuations, and achieve the effect of simple structure, stable structure and high specific surface area

Active Publication Date: 2020-04-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has small size, simple operation, and effectively reduces the cost of detection. However, this method has high requirements for the uniformity and smoothness of the coating layer, and the sensing signal is intensity modulated, which is easily affected by fluctuations in ambient temperature and humidity.

Method used

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  • A pm based on hollow-core bragg fiber <sub>2.5</sub> Concentration detection device
  • A pm based on hollow-core bragg fiber <sub>2.5</sub> Concentration detection device
  • A pm based on hollow-core bragg fiber <sub>2.5</sub> Concentration detection device

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0060] Experimental Example 1: The inner surface of the hollow-core Bragg fiber core is coated with iodine-doped polyacetylene film with a thickness of 100 nm and a mass concentration of 0-150 μg / m 3 PM 2.5 Nitrogen gas is used as the object, which interacts with the inner wall film of the fiber core respectively, and the resonant wavelength of the sensor transmission spectrum varies with the PM 2.5 The increase in concentration shifts towards shorter wavelengths. And the resonance wavelength shift Δλ is related to PM 2.5 There is a linear correlation between the mass concentrations c, and its linear regression equation is:

[0061] Δλ=kc+b

[0062] In the formula, c is the PM to be measured 2.5 Particle concentration, Δλ is the resonance wavelength shift of the hollow-core Bragg fiber transmission spectrum, k is the slope, and b is the intercept.

[0063] Known PM was used in the test 2.5 The mass concentration is 0, 10μg / m 3 , 20μg / m 3 , 50μg / m 3 , 80 μg / m 3, 100μg...

experiment example 2

[0065] Experimental Example 2: The inner surface of the hollow-core Bragg fiber core is coated with an iodine-doped polyacetylene film with a thickness of 150nm, and a known PM is used in the test 2.5 The mass concentration is 0, 10μg / m 3 , 20μg / m 3 , 50μg / m 3 , 80μg / m 3 , 100μg / m 3 , 150μg / m 3 The nitrogen in the sensor is detected, and the resonant wavelength of the sensor transmission spectrum varies with the PM 2.5 The increase of the concentration moves to the short wavelength direction, and the corresponding transmission spectrum resonance wavelength shifts Δλ are 0, 0.36, 0.72, 1.84, 2.34, 2.86, 3.62nm respectively, and the linear regression equation is: Δλ=0.0245c+0.2409, and the correlation coefficient is :R 2 =0.9685, that is, k and b in the linear regression equation are 0.0245 and 0.2409 respectively.

[0066] When the gas to be measured is in contact with the sensitive film on the inner surface of the hollow-core Bragg fiber core, the average shift of the r...

experiment example 3

[0067] Experimental Example 3: The inner surface of the hollow-core Bragg fiber core is coated with an iodine-doped polyacetylene film with a thickness of 170 nm, and a known PM 2.5 The mass concentration is 0, 10μg / m 3 , 20μg / m 3 , 50μg / m 3 , 80μg / m 3 , 100μg / m 3 , 150μg / m 3 The nitrogen is detected, and the resonance wavelength of the sensor transmission spectrum varies with the PM 2.5 The increase of the concentration moves to the short wavelength direction, and the corresponding transmission spectrum resonance wavelength shifts Δλ are 0, 0.34, 0.66, 1.84, 2.36, 2.82, 3.56nm respectively, and the linear regression equation is: Δλ=0.0243c+0.2293, and the correlation coefficient is :R 2 =0.9645, that is, k and b in the linear regression equation are 0.02434 and 0.2293 respectively.

[0068] When the gas to be measured is in contact with the nano-film on the inner surface of the hollow Bragg fiber core, the average shift of the resonance wavelength of the transmission s...

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Abstract

The invention discloses a PM2.5 concentration detection device based on hollow Bragg optical fiber. The PM2.5 concentration detection device comprises a superradiation broadband light source SLD, an optical fiber PM2.5 concentration sensor, a test air chamber, a PM2.5 generator, a switch valve, a gas flow rate meter, a spectrum analyzer and a computer connected with the spectrum analyzer, whereinthe optical fiber PM2.5 concentration sensor consists of single-mode optical fiber, a hollow Bragg optical fiber, multi-mode optical fiber and an optical fiber connector; an iodine-doped polyacetylenephotoinduced conduction adsorption film is coated on the inner surface of the air fiber core. The iodine-doped polyacetylene photoinduced conduction adsorption film with the photoinduced conduction adsorption effect on PM2.5 particles is coated on the inner surface of the air fiber core of the hollow Bragg optical fiber. The adsorption effect of the sensor can be sufficiently achieved; the PM2.5concentration sensor formed on the basis shows the characteristics of high sensitivity, simple structure and the like.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a hollow-core Bragg optical fiber fine particle concentration detection device based on changes in the refractive index of a thin film. Background technique [0002] Atmospheric fine particulate matter PM 2.5 is the primary air pollutant, PM 2.5 Particulate matter with an aerodynamic diameter less than or equal to 2.5 microns. Atmospheric PM 2.5 The main sources are: coal, sulfate, nitrate and organic matter. PM 2.5 It has a huge impact on human health, daily life and atmospheric environment quality. Therefore, for atmospheric fine particulate matter PM 2.5 The detection of mass concentration is of great significance for reducing the prevalence of the population, ensuring life safety, and preventing the occurrence of air pollution. [0003] Currently used for fine particulate matter PM in the air 2.5 The detection methods of mass concentration mainly include...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06G01N21/41
CPCG01N15/06G01N21/41G01N2015/0693G01N2201/088
Inventor 杨建春沈睿王灿刘云红陈伟民
Owner CHONGQING UNIV
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