Research On Identification Of Different Particles Via Polarization Light Scattering Measurements

Polarization information of the light scattering technology is sensitive to the shape,refractive index and microstructure and optical properties of the scattering object,so polarized light scattering particle recognition technology plays an important role in the field of atmospheric optics,cell classification and marine.In this paper,the application of polarized light scattering technology to the identification of atmospheric particulate matter is focused on the development of a new method for polarizing characterization of particle morphology properties.In order to realize the polarized light scattering measurement of suspended particulates such as atmospheric particulate matter,our on-line measuring device of gas and liquid two different phase suspension system was constructed.Difficulty of polarized light scattering of atmospheric particles on the one hand lies in the selection and analysis of scattering matrixes of particles,and on the other hand,the single scattering signal processing of particulate matter.The contents of this paper are as follows:Aiming at the feasibility of recognizing the properties of atmospheric particulate matter by polarized light scattering measurement,the change of total polarization Muller matrixes corresponding to different morphological particles is calculated from the theoretical simulation.On the basis of this,it is proved that the different polarizing parameters distinguish the particle morphology.On the one hand,the effect of different symmetric morphology on the polarization of the all polarized Muller matrix is given.On the one hand,considering the requirement of simultaneous detection in single particle suspension state,the K2 index at 85° is selected as the particle Morphological characterization parameters.At the same time,the theoretical analysis and experimental control of the scattering model of three different particle morphology of sphere,spheroid and column were carried out.The analytical ability of polarized index was verified by the experiment of single sample and mixed sample.The polarized light scattering is used to measure the polarized light scattering of the atmospheric aerosol.The work of the measured part of the work related to polarized light scattering measurement technology and particle scattering pulse extraction technology.The results of the polarized scattering of atmospheric particulates involved in the paper include the laboratory simulation environment and the outdoor pollution field environment in Beijing(December 2015).The preliminary results show the on-line recognition ability of the polarized light scattering technology.The long-term continuous work and the online dynamic response the ability to measure the hourly variation of carbonaceous components in aerosols is consistent with the on-line equipment based on thermo-optic technology,which validates the potential of polarized indicators to identify particulate matter properties for further multidimensional polarization index information extraction and Multi-attribute particle identification laid the foundation.In this paper,the polarized light scattering of atmospheric particulate matter identification technology from the theoretical simulation and experimental verification.The two aspects of the initial focus on particle properties for the extraction of specific indicators and demonstrated the classification effect.We debugged our instrument and improved the data processing process,finally shown the instrument identification particle ability in the preliminary measurement.