Simulation And Experiment Study Of Liquid Adaptive Lens

Liquid adaptive lens is a kind of tunable optical device due to it's non-mechanical movement,short response time,compact structure,low power consumption,and it is expected to have potential applications in machine vision,medicine,display and military.In this paper,we study liquid adaptive lens theoretically and experimentally.TechWiz LCD 3D software is used to simulate the liquid crystal adaptive lens.In addition,liquid crystal lens and the lenses based on dielectrophoresis and electrowetting are made experimentally.The microscopy measuring system and beam analysis system are set up to measure the performance parameter of the liquid adaptive lenses,including focal length range,convergence ability,stability,response time and resolution.Main work of this paper:1.Liquid crystal adaptive lens with trapezoidal raised electrode is proposed,and it's performance is simulated using TechWiz LCD 3D software.We compare it's performance with traditional planar electrode liquid crystal adaptive lens.The influence of cell gap,electrode height,electrode angle,electrode width and spacing ratio on the driving voltage of liquid crystal lens is analyzed.In addition,we make and test liquid crystal lens with rhombic interdigitated electrode experimentally.The results show that when the voltage change from 0 to 40 V,the focal length of the liquid crystal lens is between +?~28.73 mm,the increase time is 126 ms,the decrease time is 95 ms,the stability error of the spot is 3.2%,resolution is 18.76 lp/mm.2.We make an adaptive liquid lens based on dielectrophoresis.The principle and structural characteristics of the adaptive lens is introduced.The change of contact angle of the droplets under the electrophoresis force and surface tension is analyzed.The microscopy measuring system and beam analysis system are set up to measure the performance parameter of the lens based on dielectrophoresis.The results show that when the voltage change from 0 to 200 V,the focal length of the lens is between 95.92 mm~18.57 mm,the increase time is 580 ms,the decrease time is 380 ms,and the stability error of the spot is 3.3%,resolution is 25.16 lp/mm.3.We also make an adaptive liquid lens based on electrowetting,and analyze the effect of the droplet's profile on focal length under electrostatic force.The parameter of the electrowetting adaptive lens is tested experimentally.The results show that when the voltage change from 0 to 200 V,the focal length of the liquid crystal lens is between 79.23 mm ~15.35 mm,the increase time was 450 ms,the decrease time is 320 ms,and the stability error of the spot is 2.3%,resolution is 30.64 lp/mm.Last but not least,we compare adaptive lens that we have made with commercial Optotune lens,including optical parameters,structural properties,application area,advantages and disadvantages.