基于组合结构的双界面液体透镜的设计与分析

Design and analysis of the double-interface liquid lens based on a combination structure

为了提高液体透镜的成像质量和变焦范围,应用介电泳和液压驱动,设计了一款基于组合结构的双界面液体透镜,其主要由介电泳双液体透镜和PDMS薄膜液体透镜组成。首先,在Comsol软件中建立液体透镜模型,研究不同电压下的液滴界面和PDMS薄膜的面型变化,并导出两个曲面的面型数据。其次,在Matlab软件中,采用非球面表达式进行拟合,得到不同电压下液滴的界面和薄膜的面型图及其相应的非球面系数。最后,在Zemax软件中,构建出相应的双界面组合液体透镜光学模型,像面选取为高斯像面,并通过相应器件的制备与初步实验研究,将仿真结果和实验数据进行比较分析。结果表明,所设计的基于组合结构的双界面液体透镜仿真和实验的变焦范围基本一致,同时实验获得的变焦比可达2.1254、成像分辨率最大可达101.5937 lp/mm。本文设计的基于组合结构的双界面液体透镜具有结构简单紧凑、界面可调控性强、成像分辨率高的优点。

In order to improve the image quality and variable range of focal length of liquid lenses,a doubleinterface liquid lens based on a combination structure is designed utilizing dielectrophoretic and hydraulic drive mechanisms,which mainly consists of a dielectrophoretic double-liquid lens and a PDMS membrane liquid lens.First,the liquid lens model is established with Comsol software,the surface profile changes of droplets and PDMS membrane under different voltages are studied,and the surface profile data of two surfaces are derived.Second,the aspherical expression is used to fit with Matlab software,and the interface profiles of droplets and PDMS membrane under different voltages and the corresponding aspherical coefficient are obtained.Finally,the corresponding double-interface combined liquid lens optical model is built with Zemax software,and the image plane is selected as the Gaussian image plane.The simulation and experi-mental data are compared and analyzed through the corresponding device’s fabrication and the preliminary experimental research.The results show that the variable focal length range of the designed double-interface liquid lens based on the combined structure of the simulation is consistent with that of the experiment.Additionally,the results show that the zoom ratio and the imaging resolution can reach 2.1254 and 101.5937 lp/mm,respectively.The double-interface liquid lens based on the combination structure has the advantages of a simple and compact structure,strong interface adjustability,and high resolution imaging.