颗粒群光散射法测量气溶胶质量浓度的分形理论模型及应用研究

项目名称： 颗粒群光散射法测量气溶胶质量浓度的分形理论模型及应用研究

项目编号： No.61307113

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 顾芳

作者单位： 南京信息工程大学

项目金额： 25万元

中文摘要： 气溶胶的质量浓度是评价大气环境变化的一个非常重要参数，颗粒群光散射法是在线非接触测量该参数的有效途径。颗粒质量和形貌在光散射法的质量浓度反演中是两个主要因素。本项目拟将分形理论应用于颗粒群光散射法，从颗粒质量和形貌两方面出发，进一步研究该方法的测量理论，具体内容包括：将气溶胶颗粒物等效为颗粒凝聚体集合，研究该集合对应光散射脉冲信号幅度分布的统计分形特性；提出利用颗粒物的光学等效粒度分布反演质量浓度的分形模型，并给出随机形貌分维数及与光散射脉冲信号通道对应的颗粒凝聚体等效质量概念，从而使模型的反演精度提高，物理概念清晰、完善；设计标定实验装置，利用申请人提出的交集点标定法解决反演算法中分维数的标定方法,实现对气溶胶质量浓度的实时监测。本项目的研究以期能够为颗粒群光散射法应用于在线监测气溶胶质量浓度提供一种新的测量方法

中文关键词： 颗粒群光散射；气溶胶质量浓度；电压信号幅度分布；分形；相对湿度

英文摘要： Aerosol mass concentration is a very important parameter to evaluate the changes of atmospheric environment, and the light scattering of particles is an effective way of on-line and nonintrusive measurement of it. Particle mass and shape are the two main factors in the inversion of aerosol mass concentration by the light scattering method. In this project, considering the two aspects of particle shape and mass, the fractal theory will be applied to the light scattering method to further investigate the measurement theory. The specific content as follows: aerosols are equalized as a group of particle aggregates, and the statistical fractal characteristics of the aggregates group's signal amplitude distribution are analyzed. And then, the fractal model for aerosol mass concentration by using the optical equivalent diameter distribution of particles is presented,and the concepts of the factal dimension of random shape and the equivalent mass of the particle aggregates in a voltage channel are given. Besides, a clear physical fractal model for inversing aerosol mass concentration is established, which can improve the precision of measurement. Finnally, desiging the experimental device,the fractal dimension in the inversion algorithm can be calibrated by the intersection point calibration method proposed by the appli

英文关键词： particle group light scattering ；aerosol mass concentration；signal amplitude distribution；fractal ；relative humidity