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Atmospheric environment pollution monitoring system and detection method

A monitoring system, atmospheric technology, applied in material excitation analysis, fluorescence/phosphorescence, etc., to achieve the effect of good repeatability, good repeatability, convenient and powerful generalization and self-learning ability

Inactive Publication Date: 2010-08-04
NANKAI UNIV
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Problems solved by technology

[0005] The invention provides a multi-component completely non-contact online air pollution monitoring system and a technical solution of a detection method to overcome the deficiencies of the existing optical monitoring technology

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  • Atmospheric environment pollution monitoring system and detection method

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Embodiment Construction

[0050] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0051]Air pollution monitoring system, including femtosecond pulsed laser, incident light converging lens, reflector, sample cell, fluorescence converging lens group, spectrometer, wavelet filtering module, neural network classification module, principal component quantitative analysis module. It is characterized in that: the femtosecond pulse laser emitted by the femtosecond pulse laser (1) is focused in the sample cell (4) after passing through the focusing lens (2) and the mirror (3), forming a plasma channel and forming a "silk" phenomenon , the high-density energy in the filamentary pulsed light field causes the biochemical pollutant molecules to undergo nonlinear ionization and dissociation, resulting in a fluorescent spectrum with molecular spectral characteristics. The spectrum is imaged by the lens group (5) and detected by the CCD in the ...

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Abstract

The invention relates to atmospheric environment pollution monitoring system and detection method, in particular to a device for acquiring fluorescence spectra generated by the interaction of the short-pulse laser and the atmosphere and the quantitative analysis of the fluorescence spectra. The system comprises a short-pulse laser, a light path part, a fluorescence spectrum acquiring part and a data processing and analyzing part. The system is characterized in that the pulse femtosecond laser sent out by a pulse femtosecond laser device goes into a sample cell via a femtosecond laser focusing lens group and a reflector, the lens group simulates the self focusing by the laser kerr effect, shatters gas molecules to generate multi-photon / tunnel ionization, and sends out nonlinear fluorescence spectra, the spectra are imaged by the lens group and are obtained by a spectrophotometer and a CCD (Charge Coupled Device) by detection, and the spectra respectively go into a sort module and a quantification module after going into a filtering module to be subject to the gas sorting and the quantitative analysis. The invention can carry out the nonlinear fluorescence spectrum analysis on gases of extensive wave bands from infrared to ultraviolet, can simultaneously monitor multiple gaseous pollutants, and has good instantaneity.

Description

technical field [0001] The invention relates to an atmospheric environmental pollution monitoring system and detection method, in particular to an acquisition device and quantitative analysis of the fluorescence spectrum generated by the interaction between a short pulse laser and the atmosphere, and belongs to the field of photoelectric detection technology. technical background [0002] With the rapid development of industry and the sharp increase of vehicles, air pollution has become a very prominent problem. In order to better control and control pollution and improve air quality, it is necessary to monitor the atmosphere in real time to understand and grasp the degree of air pollution in a timely manner. Traditional air pollution monitoring is based on wet chemical technology and experimental analysis after aspiration sampling, which does not have real-time and continuous monitoring capabilities. In recent years, many atmospheric environment monitoring technologies hav...

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Application Information

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IPC IPC(8): G01N21/64
Inventor 常胜江陈扬张太宁
Owner NANKAI UNIV
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