一种新型液晶透镜的光学成像特性研究  

OPTICAL IMAGING CHARACTERISTICS OF A NEW LIQUID CRYSTAL LENS

作　　者：李晖[1] 张新宇[1] 张天序[1] 沈绪榜[1] 

机构地区：[1]华中科技大学图像识别与人工智能研究所多谱信息处理技术国防科技重点实验室,湖北武汉430074

出　　处：《红外与毫米波学报》2009年第6期428-431,共4页Journal of Infrared and Millimeter Waves

基　　金：国家自然基金重点资助项目(60736010);国家自然基金项目(60777003)资助

摘　　要：在前人的单圆孔电极液晶透镜的基础上进行了改进,使用聚酰亚胺取代玻璃作为绝缘层,得到了通光孔径为2mm、工作电压最低为1.1Vrms的新型液晶透镜.结合几何光学和液晶理论提出了不同于前人解释液晶透镜原理的模型,推导出该液晶透镜的焦距公式以及相位延迟公式.在1.1～20Vrms电压范围下测试,得到与公式计算值基本一致的该液晶透镜的焦距范围20～480mm.重点研究了该液晶透镜的调制传递函数（MTF）,发现该液晶透镜的光学成像能力与控制电压成正比关系,随着电压的增大该液晶透镜的成像性能逐渐增强.A new circular hole pattern electrode liquid crystal （LC） lens was proposed, which used the polyimide film to replace the glass as an isolation layer. This LC lens has a 2mm clear aperture, and it can operate at as low as 1.1Vrms controlled voltage. A model, for which the explanation of LC lens was different from the traditional one, was proposed by combining geometrical optics with the theory of LC. Then the theoretical formulas of focal length and phase retardation were obtained. The focal length is from 20mm to 480mm tested in the range from 1.1Vrms to 20Vrms the value of which is close to the theoretical value. The modulation transfer function of LC lens was also studied. It is found that the imaging characteristics are proportional to the controlled voltage. As the voltage increases, the imaging characteristics also enhance.

关 键 词：液晶透镜 自适应光学 调制传递函数(MTF) 

分 类 号：TP211.6[自动化与计算机技术—检测技术与自动化装置]