| Evaluation of Influence of Multiple Scattering Effect in Light-Scattering-Based Applications |
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| 作者姓名： | 徐升华 孙祉伟 |
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| 作者单位： | NML, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grand Nos 10672173 and 10332050, and the China Postdoctoral Science Foundation. |
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| 摘 要： | The extinction cross sections of a system containing two particles are calculated by the T-matrix method, and the results are compared with those of two single particles with single-scattering approximation. The necessity of the correction of the refractive indices of water and polystyrene for different incident wavelengths is particularly addressed in the calculation. By this means, the volume fractions allowed for certain accuracy requirements of single-scattering approximation in the light scattering experiment can be evaluated. The volume fractions calculated with corrected refractive indices are compared with those obtained with fixed refractive indices which have been rather commonly used, showing that fixed refractive indices may cause significant error in evaluating multiple scattering effect. The results also give a simple criterion for selecting the incident wavelength and particle size to avoid the ＇blind zone＇ in the turbidity measurement, where the turbidity change is insensitive to aggregation of two particles.
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| 关 键 词： | 散射反应 光散射 光学 波长 |
| 收稿时间： | 2007-2-14 |
| 修稿时间： | 2007-02-14 |
Evaluation of Influence of Multiple Scattering Effect in Light-Scattering-Based Applications |
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| XU Sheng-Hua,SUN Zhi-Wei.Evaluation of Influence of Multiple Scattering Effect in Light-Scattering-Based Applications[J].Chinese Physics Letters,2007,24(6):1763-1766. |
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| Authors: | XU Sheng-Hua SUN Zhi-Wei |
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| Institution: | NML, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 |
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| Abstract: | The extinction cross sections of a system containing two particles are calculated by the T-matrix method, and the results are compared with those of two single particles with single-scattering approximation. The necessity of the correction of the refractive indices of water and polystyrene for different incident wavelengths is particularly addressed in the calculation. By this means, the volume fractions allowed for certain accuracy requirements of single-scattering approximation in the light scattering experiment can be evaluated. The volume fractions calculated with corrected refractive indices are compared with those obtained with fixed refractive indices which have been rather commonly used, showing that fixed refractive indices may cause significant error in evaluating multiple scattering effect. The results also give a simple criterion for selecting the incident wavelength and particle size to avoid the `blind zone' in the turbidity measurement, where the turbidity change is insensitive to aggregation of two particles. |
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| Keywords: | 82 70 -y 42 25 Bs |
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