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利用Ｍｉｅ散射与Ｆｒａｕｎｈｏｆｅｒ衍射理论的数值计算，对球形颗粒的Ｍｉｅ散射和Ｆｒａｕｎｈｏｆｅｒ衍射做了大量的计算和分析比较，提出了大颗粒的Ｆｒａｕｎｈｏｆｅｒ衍射近似替代Ｍｉｅ散射的判据。
Based on the numerical calculation of Mie scattering and Fraunhofer diffraction theory, a large number of calculations and analyzes were made on the Mie scattering and Fraunhofer diffraction of the spherical particles. The criterion of replacing the Mie scattering with the Fraunhofer diffraction of large particles is proposed.