LIBS and Raman spectrum aerosol online detection device based on single particle

Abstract

The invention relates to an LIBS and Raman spectrum aerosol online detection device based on a single particle. An aerodynamic lens is used for focusing an atmospheric aerosol particle sample into a collimated particle beam and screening a particle size, and an oscilloscope, two continuous lasers and corresponding photomultipliers jointly form a double-beam diameter measuring system. And a first Nd: YAG laser and a second Nd: YAG laser act with particulate matters to excite a Raman spectrum and an LIBS spectrum. Element composition information in aerosol particles can be detected in real timethrough the LIBS spectrum, characteristic spectral lines of all elements belong to atomic spectral lines, and overlapping interference is avoided. The Raman spectrum studies vibration and rotation spectrum of molecules to obtain structure information of aerosol particles, and obtains lattice vibration information of a particle sample. The device is simple and compact in structure and low in instrument requirement, background noise interference is eliminated only through a low-vacuum environment, and cost of the detection device is reduced. The device is short in detection process, and an analysis result can be obtained after a single pulse laser.

Description

technical field [0001] The invention belongs to the field of atmospheric environment detection, and in particular relates to a single-particle-based LIBS and Raman spectrum aerosol online detection device. Background technique [0002] Atmospheric aerosol is a colloidal dispersion system formed by dispersing and suspending small particles of solid or liquid in a gaseous medium. It is flake, needle and other irregular shapes. Aerosol particles come from a wide range of sources, including natural sources such as fine ash and fine dust blown up by the wind, salt particles evaporated from seawater, fallout from volcanic eruptions, and smoke from forest burning, as well as fossil and non-native sources. Anthropogenic sources such as the combustion of fossil fuels, transportation, and smoke emissions from various industrial processes. Because of the wide range of sources, the chemical composition of aerosol is also very complex, which contains various trace metals, inorganic oxi...

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Problems solved by technology

[0005] However, in the prior art, single particle technology is mainly used with mass spectrometer (single particle aerosol mass spectrometer). (10 -6 Torr), most of the parts used are imported, and the cost of the instrument is relatively high

In addition, there are still difficulties in the identification of components with the same mass number using mass spectrometry, some spectral peaks may not be accurately judged, and mass spectrometry analysis cannot provide the molecular structure of particulate matter

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