The radiation characteristics of microalgae are of great significance for the design of photobioreactors and ocean optical remote sensing. The complex structure of microalgae makes it difficult to theoretically calculate its radiation characteristics. Herein, the spherical microalgae cells are modeled, considering the shape of cells similar to the spherical cell microstructure, and a heterogeneous multi-sphere model is constructed. To investigate the influence of microstructure on the radiation characteristics of microalgae, the effects of different simplified equivalent models on the radiation characteristics are first analyzed and compared with the experimental results. The results show that the absorption cross-section of microalgae mainly depended on the type and content of pigments, and was less affected by cell microstructure. The scattering cross-section of microalgae cells is greatly influenced by the cell microstructure and refractive index of the microalgae components, and the degree of influence intensifies with the increase of size parameters. The simplified equivalence of internal micro-structures leads to an increase in the amplitude of the scattering phase function and a decrease in backscattering. The internal microstructure of microalgae is taken into account, and the model is characterized by the optical constants of the microalgae components, which helps to improve the accuracy of the scattering cross-section (about 25 %–95 %) and backscattering brought on by the detailed optimization of the actual cell. Note that the radiative properties are highly accurate, and the theoretical calculations are substantially more efficient when using the three-layer sphere model.

中文翻译：

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协同考虑细胞器光学常数和细胞内部结构的球形微藻的辐射特性


微藻的辐射特性对于光生物反应器和海洋光学遥感的设计具有重要意义。微藻的复杂结构导致其辐射特性难以从理论上计算。本文对球形微藻细胞进行建模，考虑细胞形状与球形细胞微观结构相似，构建异质多球模型。为了研究微藻的微结构对辐射特性的影响，首先分析了不同简化等效模型对微藻辐射特性的影响，并与实验结果进行了比较。结果表明，微藻的吸收截面主要取决于色素的种类和含量，受细胞微观结构的影响较小。微藻细胞的散射截面受微藻成分的细胞微观结构和折射率的影响较大，且影响程度随着尺寸参数的增加而加剧。内部微结构的简化等效导致散射相函数幅度的增加和后向散射的减少。该模型考虑了微藻的内部微观结构，用微藻成分的光学常数来表征，有助于提高散射截面（约25%~95%）和微藻带来的后向散射的精度。实际电池的详细优化。请注意，使用三层球模型时，辐射特性非常准确，并且理论计算效率显着提高。