学科分类
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9 个结果
  • 简介:Thisreviewcoverstheprogressoflightscatteringapplicationsinthefieldofparticlecharacterizationinthepastdecade.Thereviewaddressesstaticlightscattering(themeasurementofscatteringintensitiesduetolight-particleinteractionatvariousspatiallocations),dynamiclightscattering(themeasurementofscatteringduetolight-particleinteractionasafunctionoftime),andscatteringtrackinganalysis(thetrackingofparticlemovementthroughscatteringmeasurement).

  • 标签: 静态光散射 应用 表征 颗粒 粒子相互作用 综述
  • 简介:Inthispaper,animagedynamiclightscatteringmethodfornanoparticlesizingisintroduced.ThespatialdistributionofthescatteredlightsfromnanoparticlesundergoingBrownianmotionwascapturedatahighframeratebyadigitalcamerawithinonesecond,whichisconsiderablyfasterthantheconventionalphotoncorrelationspectroscopymethod.Thecapturedseriesofphotographsweremeshedintothousandsofsmallunitsforcalculatingtheintensityautocorrelationfunctionsinparallel.Experimentalresultsfromthemeasurementsofthreereferencenanoparticlesamples(27,80,and352nmindiameters)demonstratedthefeasibilityofthismethod.

  • 标签: 动态光散射法 纳米颗粒 图像 光子相关光谱法 上浆 数字照相机
  • 简介:为水里的大球形的水泡,几何光学近似为散布模式的精明的光被认为一个更好的方法。在这份报纸,几何光学近似的基本理论被澄清。当全部的思考发生时,为水泡的阶段的变化被计算,它与有比1大的相对折射索引的粒子不同。方法的确认被假定一个球形的粒子并且把现在的结果比作Mie散布和Debye计算完成。当无尺寸的尺寸参数比50大时,对Mie理论的同意在所有方向是优秀的。几何光学近似的限制也被讨论。

  • 标签: 几何光学 近似值 光散射 物理
  • 简介:Whenasurfaceisilluminatedbylaser,thefieldofdiffusingreflectivelightcanbedescribedbyFresnel-KirchhoffintegrationintheregionofFresnel.Ifthecorrelation,beforeandafterthechangeofintensityfield,isanalysedbystatisticalmethod,threegoverningequationsforvariationsofintensityfieldandspecklemovementformulascanbeobtained.Intheseequations,thesurfacemotion,deformationandwavelengthchangeareallconsideredtocausethespecklemovement.

  • 标签: LASER SPECKLE SPECKLE INTERFEROMETRY SPECKLE METROLOGY
  • 简介:Thispaperpresentsamethodtomeasurethein-planedisplacementfieldsofcurvedsurfacebymoireinterferometryofpartialcoherentlight.Themethodhasthefollowingadvantages:simpleopticalsystem,norequirementonvibrationisolation,highsensitivity,largemeasuringrange,highcontrastofinterferencefringesandavailabilitytoin-situstructuraltesting.Thepresentpaperalsogivestheoreticalanalysisofthemethodandtheformulasoflightintensityanddisplacementfield,andintroducesareplicationtechniquetoformahighfrequencyreflectancegratingonthecurvedsurface.Theexperimentsachievedthemeasurementofthesurfacedisplacementfieldofacylindricalshell—thesimultaneouscircumferential,axialand45°displacementfields.Thetorsionaltestdataforsurfacedisplacementofacircularbaragreewellwiththetheoreticalresult.

  • 标签: MOIRE INTERFEROMETRY partial COHERENT light CIRCUMFERENTIAL
  • 简介:W,N共同做TiO2nanoparticles被一个solgel方法综合。准备样品被X光检查衍射(XRD)描绘,域排放扫描电子显微镜学(FE-SEM),传播电子显微镜学(TEM),Fourier变换红外线的光谱学(英尺红外),X光检查光电子光谱学(XPS)和弥漫的反射spectrophotometry(医生)。结果证明共同做的光催化剂是有22.5nm的最小的粒子尺寸的实质上一致的球形的粒子。比作未做的TiO2,N-TiO2和P-25,W的吸收边,N共同做转移到更长的波长的TiO2和它为在Xe灯(350W)下面的甲基橘子(瞬间)的降级的photocatalytic活动更高。

  • 标签: N-TiO2 光催化剂 共掺杂 场发射扫描电子显微镜 光驱动 傅里叶变换红外光谱
  • 简介:有一个更合适的操作员的一个修改规则化算法基于散布原则的Mie在激光粒子sizer从轻散布的数据为粒子尺寸分发(PSD)的倒置被建议。概括交叉验证(GCV)方法和L曲线方法被用于决定规则化参数。连续在松驰上(SOR)反复的方法被用来增加集成的结果的精确和稳定性。模仿的结果基于修改算法在与为九件标准微粒样品,他们的混合物以及三天赋测量的试验性的数据的一个好协议有不规则的形状的微粒材料,显示这个修改规则化方法为从相应轻散布的数据的PSD的模拟不仅可行而且有效。

  • 标签: 正则化算法 粒度分布 数据反演 光散射 粒子 数据模拟
  • 简介:TiO2-loadedactivatedcarbonfibers(ACF)werepreparedbyahydrothermalmethod.Thesampleswerecharacterizedbyscanningelectronmicroscopy(SEM),X-raydiffraction(XRD),Fouriertransforminfrared(FT1R)spectrometryandUV-visdiffusereflectancespectra(DRS).SEMimagesshowedthattheTiO2nanoparticlesweredepositedonthesurfaceofACF,andtheparticlesizeandloadingamountofTiO2werevariedbychangingtheinitialconcentrationoftetrabutyltitanate(TBOT).TheresultsofanashexperimentshowedthattheloadingamountsofTiO2were18.4%,43.3%,52.5%,75.1%,and91.1%forinitialconcentrationsofTBOTof0.07,014,0.21,0.28,and0.35mol/L,respectively.PhysicalinteractionsplayedanimportantroleintheformationofTiO2/ACFcompositefibersthatabsorbUVandvisiblelight.ComparedwiththoseofACF,improvedadsorptionandphotocatalyticactivitytowardRhodamineB(RhB)wereobservedforTiO2/ACFcompositefiber.TheRhodamineBcouldberemovedefficientlybyTiO2/ACFcompositefibers,andtheTiO2loadingamounthadasignificanteffectonthephotocatalyticactivityofTiO2/ACFcompositefibers.

  • 标签: 纳米TiO2 光催化活性 可见光照射 吸附性能 负载量 活性炭纤维