Design,Modeling And Image Quality Assessment Of The Optical System With Large Zoom Ratio Using Electrowetting-based Triple-Liquid Dual-Zoom Lens

Zoom optical system is a key component in optical devices such as mobile phone,camera,telescope,endoscope,thermal imager and so on.It is widely used in communications,medical,aerospace and many other fields.The traditional zoom optical system uses the relative movement between the motor and the gear to achieve zoom,but this mechanical movement will bring some defects such as easy to be worn,expensive,difficult to achieve miniaturization and so on.But the liquid lens based on the electrowetting has the advantages of fast response,low power consumption,low price,small volume and easy to integrate,which becomes the new element in the zoom optical system.In this paper,a triple-liquid dual-zoom lens and a triple-liquid variable optical axis liquid lens based on electrowetting are designed.On this basis,a variable-focus optical system with large magnification ratio and high image quality is designed.The main research work is:Firstly,summaries the background and development of the electrowetting liquid lens and its zoom optical system.Introduces the theory of dielectric wetting principle and different liquid lens with different structures.Deduces the relationship between the focal length of the lens and the applied voltage.Introduces two kinds of design methods of the zoom optical systems.Secondly,simulates the triple-liquid lens based on electrowetting by COMSOL simulation software.The process of controlling the shape of the liquid interface by controlling the voltage of the conductive liquid is studied.Analyze the relationship between the interface surface shape and the focal length of the triple-liquid lens and calculate the zoom range of the system.Thirdly,designs a triple-liquid variable optical axis liquid lens system.Based on the COMSOL software,the double-liquid / triple-liquid lens are modeled.Compares the relationship between the deflection angle of the optical axis and the voltage applied on the liquid lenses and analyzes the response time of the lens interface.At last,takes the triple-liquid zoom lens as the core components and using the self-focusing characteristic of the triple-liquid lens compensates the image plane position and mechanical movement of large zoom ratio zoom optical system with three components is designed.Simulates and optimizes the quality of the system by ZEMAX software.From the aspects of ray aberration,spot diagram,field curvature,distortion and MTF graph evaluates the imaging quality of the system.Selects a specific combination of liquid material and optimizes the system structure,the final designed system can ensure the advantages of micro-controllable,continuous zoom,large zoom ratio on the basis of maintaining good image quality.