Large aperture tunable-focus liquid lens using shape memory alloy spring
Large aperture tunable-focus liquid lens using shape memory alloy spring
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DOI：
10.1364/oe.24.013334
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发表时间：
2016-06-13
期刊：
影响因子：
3.8
通讯作者：
Mastrangelo, Carlos H.
中科院分区：
文献类型：
--
作者：
Hasan, Nazmul;Kim, Hanseup;Mastrangelo, Carlos H.
利用形状记忆合金（SMA）弹簧作为驱动器，构造了一种可调焦距的大口径液体透镜。该透镜主要由一个浅的充满液体的圆柱形腔体组成，该腔体由薄的可压缩环形边缘限定，并由边缘顶部的柔性圆形膜和边缘底部的刚性圆形板封装。透镜光焦度通过三个形状记忆合金（SMA）弹簧的致动通过环形边缘的受控压缩来调节。由于腔液体的体积是恒定的，边缘压缩使柔性膜向外凸出，从而减小其曲率半径和透镜焦距。所制造的可调谐透镜展示了利用小于3V的驱动电压的0-4屈光度的光功率范围。使用Shack-Hartmann传感器进行透镜光学波前轮廓分析，在0 D和+4 D处显示0.77 μ m和1.68 μ m的RMS波前误差。所制造的透镜的孔径和厚度分别为34 mm和9 mm，同时重量为16.7 g。2016美国光学学会Optical Society of America
A tunable-focus large aperture liquid lens is constructed using shape memory alloy (SMA) springs as actuators. The lens mainly consists of a shallow liquid-filled cylindrical cavity bound by a thin compressible annular rim and encapsulated by a flexible circular membrane on the top of the rim and a rigid circular plate at the rim bottom. The lens optical power is adjusted by a controlled compression of the annular rim via actuation of the three shape-memory alloy (SMA) springs. Since the volume of the cavity liquid is constant, the rim compression bulges the flexible membrane outward thus reducing its radius of curvature and the lens focal length. The fabricated tunable lens demonstrated an optical power range of 0-4 diopters utilizing a driving voltage less than 3V. Lens optical wavefront profiling was done using a Shack-Hartmann sensor displaying a RMS wave front error of 0.77 mu m and 1.68 mu m at 0 D and + 4 D. The aperture diameter and thickness of the fabricated lens are 34 mm and 9 mm, respectively, while weighing 16.7 g. (C)2016 Optical Society of America