共查询到17条相似文献,搜索用时 139 毫秒
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偏振状态下球形粒子的散射相位函数研究 总被引:1,自引:0,他引:1
本文根据散射相位函数的定义,得到了偏振状态下单个粒子散射相位函数的表达式,并且通过研究发现以下规律:1)粒子半径越小,极值差随散射角越趋向于对称分布;2)散射角在0~0.025π以及O.997π~π之间,散射相位函数随极化角基本不变;3)散射角在O.025π~0.997π之间,散射相位函数随极化角变化明显.同时比较了偏振状态下多粒子和单粒子散射相位函数随散射角和极化角的分布.最后从大气中光传输理论出发,建立了非偏振状态与偏振状态下散射相位函数的关系,为大气散射回波功率测量以及近似散射相位函数的研究提供参考. 相似文献
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用Mie电磁散射理论测量电介质微粒特性的透射方法 总被引:1,自引:0,他引:1
本文提出一种基于Mie电磁散射理论测量微粒特性的透射芳法,可测出含微粒介质中微粒的有效折射率、粒径和数目浓度。此方法所用设备简单,操作容易。以聚苯乙烯标准微粒为例,介绍了测量及求解方法。 相似文献
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测量下限是光散射颗粒测试技术的关键问题。本文通过理论分析、比较归一化散射光强的分布图和构造方差函数F(d)对颗粒散射光的光强分布进行了定性和定量的讨论,对Mie散射向Rayleigh散射趋近的情况进行了分析,讨论了散射光光强大小的分布,分析了测量不同粒径的颗粒的可行性,最终得到在入射光源是波长为0.6328μm的He-Ne激光器的情况下,当粒径d取200nm以上时,不同粒径颗粒的M ie散射光强分布有较大差别,适合用静态光散射的方法来判断颗粒粒径。 相似文献
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经典Mie散射的数值计算方法改进 总被引:7,自引:2,他引:7
在光散射颗粒测量技术中,Mie散射理论的计算非常重要。本文介绍一种改进的Mie散射数值计算方法,通过对Mie散射系数进行重新构造,找到参量来控制Mie计算的收敛和计算精度。对各有关参量选用合适、稳定的递推关系进行计算。数值计算结果表明该方法具有快速、稳定的优点,可以在极大的颗粒粒径和折射率范围内得到合理结果。 相似文献
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光-电检测法应用于气-固两相流微粒浓度的测量时,被测固体颗粒直径的变化对测量结果将产生明显影响.以致使测量结果与实际状态相反.本文分析了固体颗粒粒径对测量的影响,并提出了有效的修正方法. 相似文献
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Kowsalya D. Rasamani Jonathan J. FoleyIV Brittney Beidelman Yugang Sun 《Nano Research》2017,10(4):1292-1301
The optical absorption of semiconducfing AgBr nanocubes is significantly increased by up to 5 times in the measured spectral range when they are bonded to the surface of dielectric SiO2 nanospheres through electrostatic interaction.The absorption enhancement factor depends on the wavelength and the size of the SiO2 nanoparticles (NPs).Finite-difference time-domain calculations provide the nearfield intensity mapping of a heterostructure that is composed of a AgBr nanocube in close contact with a SiO2 nanosphere.The electric-field distributions indicate the field enhancement near the SiOdAgBr interface due to light scattering and absorption enhancement in the AgBr nanocube,implying that the enhanced scattering nearfield increases the absorption cross section of the AgBr nanocube.The absorption cross-section spectra calculated using Mie theory agree with the experimental observations.This discovery sheds light on the utilization of dielectric spherical particles to increase the absorption in semiconductor NPs,thus improving the light-harvesting efficiency for solar-energy conversion. 相似文献
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由 Mie 散射光强反演颗粒粒度分布的一种改进正则化法 总被引:3,自引:0,他引:3
基于Mie散射的激光粒度仪广泛地应用在颗粒粒度测量中,其中由光强分布演算出粒度分布的计算方法一直是关注的热点。此反演问题属于第一类Fredholm算子方程,具有不适定性,难以得出准确的稳定解,需要用高效的数值算法。本文提出一种应用于该类仪器颗粒粒度分布反演问题的改进正则化法,采用广义交叉验证法(GCV)来选择正则参数,并引入松弛技术,将迭代值加工成一种松弛值以改善精度,得出了稳定的正则拟解(近似解)。经标准颗粒的验证和计算机模拟证实,此算法是可行和有效的。 相似文献
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Soojeong Cho Tae Soup Shim Ju Hyeon Kim Dong‐Hyun Kim Shin‐Hyun Kim 《Advanced materials (Deerfield Beach, Fla.)》2017,29(22)
Black melanin inks are prepared to selectively exhibit colors under strong light, inspired by human hair. High absorbance of melanin suppresses multiple scattering, causing resonant Mie scattering predominant. Various colors can be developed as the resonant wavelength dictated by nanosphere diameter. Therefore, the melanin inks can be used to encrypt and selectively disclose multicolor patterns for anticounterfeiting applications. 相似文献
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The electromagnetic radiation scattering patterns were computed using an improved C program to study variations in the patterns with changes in the size distribution, size parameters and refractive index of small particles in a volume element. The particle size distributions considered were gamma, normal and lognormal. The program is stable for computation of the theoretical values of the non-zero elements of the scattering matrix, efficiency factors, single scattering albedo, radiation pressure and asymmetry parameter for particles ranging from very small to very large size parameters. One of the significant features of the program is that it incorporates two methods for the determination of the optimal number of terms required for the computation of Mie series with the added benefit of having the option of either going for computational speed or accuracy. After a comparison of the C program with other reported benchmark results, it has been found that the program is very accurate and reliable for electromagnetic scattering computations. 相似文献