摘要
研制了介电润湿双液体变焦透镜以实现变焦透镜的微型化及无机械部件情况下透镜的自动变焦。基于介电润湿原理制备了双液体变焦透镜。采用CCD图像测量系统,测量了不同电压下透镜的焦距,并与基于高斯光学理论推导的焦距公式进行了比较。然后,采用COMSOL软件,分析了双液体界面面形随电压的变化,讨论了动力黏度系数对透镜性能的影响。结果表明,随着电压的增大,双液体界面从初始弯向导电盐溶液变为平面继而弯向绝缘油,相应的双液体透镜实现了从凹透镜到凸透镜的转变,临界电压为50V。当电压增大至65V左右时,透镜焦距不再减小。透镜焦距经历了从负到零再到正的变化(-∞,-22.83mm)∪(33.47mm,+∞),基本实现了焦距大范围可调。当动力黏度系数为0.03时,液体透镜的响应时间为0.015s,对应的器件稳定性最佳。
An electrowetting-based double-liquid lens was developed to realize the small volume and au- tomatic focusing without mechanical components for the focus-variation lens. The electrowetting- based double-liquid lens was designed and fabricated based on the dielectric wetting principle. Then, the focal length of liquid lens for different voltages was measured by a CCD image measurement sys- tem and it was compared with the theoretical value calculated by Gauss optical theory. Finally, COM- SOL was employed to analyze the curvature radius of the double liquid interface at different voltages and to discuss the effect of dynamic viscosity on the response time and stability of the liquid lens. The results indicate that the double liquid interface bends to the conductive salt solution initially and then changes into a plane and finally bends to the insulating oil when the applied voltage is increased. Ac- cordingly, the liquid lens changes from a concave lens to a convex lens, and the critical voltage is 50 V. How ever, the focal length of the liquid lens does not decrease any more when the applied voltage increases to 65 V. The whole focal length of the lens ranges from -∞ to -22.83 mm and from 33.47 mm to ＋∞, and it is adjusted continuously in a wider range. Moreover, when the dynamics viscosity of insulating oil is 0.03, the response time is 0.015 s and the corresponding performance of the device is optimal.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2014年第10期2592-2597,共6页
Optics and Precision Engineering
基金
江苏省自然科学基金资助项目(No.BK2011752)
