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1、針、^n^n^f．kjdb．org科技導(dǎo)報(bào)2014，32(18)一種基于Mie散射的顆粒物濃度測(cè)量方法周利斌讓，張大臣’，姜鵬飛’，狄傳勇。，李莎。，王江南。1．陜西科技大學(xué)理學(xué)院，西安7100212．西北大學(xué)物理學(xué)系，西安7100693．陜西科技大學(xué)電氣與信息工程學(xué)院，西安710021摘要根據(jù)Mie散射理論。采用連分式遞推算法。進(jìn)行了微粒散射的數(shù)值模擬。借助特殊函數(shù)庫(kù)得出簡(jiǎn)化的Mie散射理論的數(shù)值模擬方法，省去了推導(dǎo)的復(fù)雜性，同時(shí)提高了計(jì)算程序運(yùn)算速度。利用水溶膠模擬大氣溶膠進(jìn)行光散射實(shí)驗(yàn)，采用三波長(zhǎng)法計(jì)算得到各樣本的平均粒徑。根據(jù)
2、消光定律模擬出微粒濃度與光強(qiáng)變化之間的關(guān)系，為空氣中微粒濃度的測(cè)量提供了理論依據(jù)。關(guān)鍵詞Mie散射理論；消光定律；連分式遞推算法；三波長(zhǎng)法；水溶膠中圈分類號(hào)0436．2文獻(xiàn)標(biāo)志碼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
