PM2.5 concentration detecting device based on photoacoustic spectrometry

A concentration detection and photoacoustic spectroscopy technology, applied in the field of photoacoustic spectroscopy, can solve the problems of further improvement of sensitivity and response speed, easy to be blocked, easy adhesion of aerosols, etc., to achieve high sensitivity, strong adhesion, use long life effect

Active Publication Date: 2018-06-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the photoacoustic cell of this method is used for a long time, the aerosol will easily adhere to the inner wall of the photoacoustic cell and be blocked, and the sensitivity and response speed need to be further improved.

Method used

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  • PM2.5 concentration detecting device based on photoacoustic spectrometry
  • PM2.5 concentration detecting device based on photoacoustic spectrometry
  • PM2.5 concentration detecting device based on photoacoustic spectrometry

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0066] Experiment 1: PM 2.5 The particle generator can produce mass concentration of 0-200μg / m 3 PM 2.5 , and the known mass concentration of PM 2.5 Pass into the photoacoustic cell, and place the photoacoustic cell at room temperature (25°C) for experiments. Thanks to PM 2.5 The particles absorb light energy to generate sound pressure signals, which makes the fluorinated graphyne diaphragm on the optical fiber F-P detector (the thickness of the fluorinated graphyne diaphragm is 150nm) vibrate, that is, the cavity length of the optical fiber F-P sensor changes, and through the photodetector and the lock-in amplifier to obtain the photoacoustic signal V, and the photoacoustic signal and PM 2.5 There is a linear relationship between the mass concentrations, and the linear regression equation is:

[0067] V=kC+b (3)

[0068] In the formula, V is the photoacoustic signal obtained by the lock-in amplifier, and C is the PM 2.5 The mass concentration of , k is the slope, and b...

experiment example 2

[0071] Experiment 2: PM 2.5 The particle generator can produce mass concentration of 0-150μg / m 3 PM 2.5 , and the known mass concentration of PM 2.5 Pass into the photoacoustic cell, and place the photoacoustic cell at room temperature (25°C) for experiments. Thanks to PM 2.5 The particles absorb light energy to generate sound pressure signals, which makes the fluorinated graphyne diaphragm on the optical fiber F-P detector (the thickness of the fluorinated graphyne diaphragm is 180nm) vibrate, that is, the cavity length of the optical fiber F-P sensor changes, and through the photodetector and the lock-in amplifier to obtain the photoacoustic signal V, and the known PM is used in the experiment 2.5 Mass concentration C is 0, 10μg / m 3 , 20μg / m 3 , 50μg / m 3 , 80μg / m 3 , 100μg / m 3 , 150μg / m 3 , the corresponding photoacoustic signal V are 0.011mV, 0.221mV, 0.319mV, 1.118mV, 1.322mV, 1.843mV, 2.530mV respectively, the linear regression equation is V=0.0169C+0.0606, and ...

experiment example 3

[0073] Experiment 3: PM 2.5 The particle generator can produce mass concentration of 0-150μg / m 3 PM 2.5 , and the known mass concentration of PM 2.5 Pass into the photoacoustic cell, and place the photoacoustic cell at room temperature (25°C) for experiments. Thanks to PM 2.5 The particle absorbs light energy to generate a sound pressure signal, which makes the fluorinated graphyne diaphragm (the thickness of the fluorinated graphyne diaphragm is 200nm) on the optical fiber F-P detector vibrate, that is, the cavity length of the optical fiber F-P sensor changes, and through the photodetector and the lock-in amplifier to obtain the photoacoustic signal V, and the known PM is used in the experiment 2.5 Mass concentration C is 0, 10μg / m 3 , 20μg / m 3 , 50μg / m 3 , 80μg / m 3 , 100μg / m 3 , 150μg / m 3 , the corresponding photoacoustic signal V is 0.012mV, 0.224mV, 0.321mV, 1.122mV, 1.323mV, 1.845mV, 2.531mV respectively, and its linear regression equation is V=0.0169C+0.063, a...

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Abstract

The invention discloses a PM2.5 concentration detecting device based on the photoacoustic spectrometry. The PM2.5 concentration detecting device comprises a first laser device, a photoacoustic pool, an optical fiber F-P sound wave sensor, a second laser device, an optical fiber coupler, a photoelectric detector, a lock-in amplifier and a computer. The photoacoustic pool comprises a front bufferingchamber, a sample chamber, a rear buffering chamber and a rheomicrophone chamber. Super-hydrophobic coatings are formed on the inner walls of the front buffering chamber, the sample chamber, the rearbuffering chamber, a front guide pipe and a rear guide pipe. By means of the PM2.5 concentration detecting device, sound pressure waves are detected through the optical fiber F-P sound wave sensor based on a fluorolite vibrating membrane, and the high-sensitivity, high-response-speed and high-stability effects of the optical fiber F-P sound wave sensor can be brought into full play; the inner wall of the photoacoustic pool of the detecting device is coated with the corresponding super-hydrophobic coating, so it is avoided that PM2.5 microparticles are attached to the inner wall of the photoacoustic pool and photoacoustic signals are affected; no PM2.5 microparticles are attached to the fluorolite vibrating membrane, so the detection precision can be further improved.

Description

technical field [0001] The invention relates to the technical field of photoacoustic spectroscopy, in particular to a PM based on photoacoustic spectroscopy 2.5 Concentration detection device. Background technique [0002] Atmospheric fine particulate matter PM 2.5 PM is the primary air pollutant in my country. 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 It is of great research significance to reduce the morbidity rate of the population, ensure life safety, and prevent the occurrence of serious air pollution. [0003] At present, for the fine particulate matter PM in the air 2.5 The detection methods of mass concentration mainly include gravimetric method, β-ray attenuation method and light sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
CPCG01N15/06G01N2015/0693
Inventor 杨建春王灿沈睿刘云红陈伟民
Owner CHONGQING UNIV
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