基于对流扩散效应, 利用有限元分析法建立了一种光学渐变折射率微腔流体透镜。分析了微腔中芯、包层液体在对流扩散过程达到稳定后的浓度分布情况, 即所谓的混合流体折射率分布。研究了对流扩散模型结构, 分别在一般情况下(芯层流体折射率大于包层流体折射率)和中心凹陷情况下(芯层流体折射率小于包层流体折射率), 沿流体流动方向的不同截面对流扩散后折射率分布情况。

Based on convection-diffusion effect, a fluid lens with optical gradient refractive index microcavity was established by using finite element method. The stable concentration distribution of the core and cladding liquid after convenction-diffusion process was analyzed, which was called refractive index distribution of mixed fluid. The structure of convection-diffusion model was studied. For gradient refraction index characteristics of optical microfluidic tunable lens, the effects of different cross-sections on the stability of refractive index distribution along the direction of fluid flow direction were studied respectively in general(the refractive index of core fluid was larger than that of cladding fluid) and in the case of central depression(the refractive index of core fluid was smaller than that of cladding fluid).