一种基于Mie散射的颗粒物浓度测量方法-论文.pdf

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1、针、^n^n^f．kjdb．org科技导报2014，32(18)一种基于Mie散射的颗粒物浓度测量方法周利斌让，张大臣’，姜鹏飞’，狄传勇。，李莎。，王江南。1．陕西科技大学理学院，西安7100212．西北大学物理学系，西安7100693．陕西科技大学电气与信息工程学院，西安710021摘要根据Mie散射理论。采用连分式递推算法。进行了微粒散射的数值模拟。借助特殊函数库得出简化的Mie散射理论的数值模拟方法，省去了推导的复杂性，同时提高了计算程序运算速度。利用水溶胶模拟大气溶胶进行光散射实验，采用三波长法计算得到各样本的平均粒径。根据

2、消光定律模拟出微粒浓度与光强变化之间的关系，为空气中微粒浓度的测量提供了理论依据。关键词Mie散射理论；消光定律；连分式递推算法；三波长法；水溶胶中圈分类号0436．2文献标志码Adoi10．39814．issn．1000-7857．2014．18．002AMethodforMeasuringParticleC0ncentrati0nBasedonMieScatteringZHOULibin，ZHANGDachen，JIANGPengfei，DIChuanyong，LISha，WANGJiangnan’1．CollegeofScien

3、ce，ShaanxiUniversityofScienceandTechnology，Xi'an710021，China2．DepartmentofPhysics，NorthwestUniversity，Xian710069，China3．CollegeofElectricalandInformationEngineering，ShaanxiUniversityofScienceandTechnology，Xian710021，ChinaAbstractNumericalsimulationofparticlescatteringwa

4、srealizedusingthecontinuedfractionrecursionmethodbasedonMiescatteringtheory．AneasynumericalsimulationmethodwasobtainedbytheaidofspecialfunctionlibraryintheMiescatteringtheory，improvingthecomputingspeed．Theextinctioncoeficientwasobtainedbynumericalsimulationwithadiferent

5、refractiveindexvariationofparticlediameters．Theresultrevealedthatlightscatteringeffectsofparticleswithdifferentrefractiveindexweresimilartothoseofwateranddust，whentheparticlesdiameterislargerthanacertainvalue．Thelightscatteringexperimentofaerosolsintheatmospherewassimul

6、atedusinghydrosol，whilethedustsamplescollectedindifferentareaswereusedasparticles．LightscatteringdataofthedustsampleatdifferentwavelengthsanddifferentconcentrationswereobtainedandcomparedwiththoseofSiO2particleswhosediameteris400nm．Threewavelengthmethodwasusedtoobtainan

7、averageparticlesizeofthesample，whichisverifiedbysi02particles’experimentresuhs．Usingtheaverageparticlesizesofeachsample．therelationshipsbetweenparticleconcentrationandlightintensityvariationweresimulatedaccordingtothelawofextinction．Theexperimentalresultsareconsistentwi

8、ththoseobtainedtheoretically．Itprovidesagoodtheoreticalbasisformeasuringtheconcentrationofparticlesintheair．Ke