本文应用Eikonal近似将微椭球用其等效的球来近似, 结合Mie理论对吸收介质中微椭球体颗粒光学参数进行了数值计算。 结果表明, 椭球位置变化时, 散射和吸收性能发生变化。离心率增大时, 散射和吸收系数都增大, 离心率越大增大的越明显。波长增大时, 在紫光波长为0.4 μm和近红外区波长为1.58 μm处散射系数出现了峰值, 而吸收系数单调增大。相对折射率实部以及虚部变化对光学参数均有影响, 颗粒的吸收性越强, 散射相应地减弱。结果表明这种数值解析方法能有效地计算椭球体颗粒的光学参数。

We have given the numerical results of the optical parameters of micor-ellipsoid particles in absorbing medium by combining Mie scattering theory and Eikonal approximation, in which the micor-ellipsoid sphere was approximated as its equvialent sphere. It was shown that the scattering and absorption properties vary with the change of ellipsoid position and the increase of scattering and absorption coefficients are proportional to the increament of eccentricity. Scattering coefficient appears peaks at purple light region with wavelength 0.4 (m and at near infrared region with wavelength 1.58 (m. The absorbing coefficient increases with wavelength increases. The influences of the real and imaginary part of the refractive index on optical parameters are strong, stronger absorption will weaken scattering accordingly. The results show that the numerical method can effectively calculate the optical parameters of ellipsoid particles.