共查询到18条相似文献,搜索用时 156 毫秒
1.
为解决仿生复眼系统不能自适应变焦的问题,提出了一种基于介电润湿液体透镜曲面阵列的可变焦仿生复眼系统。分析系统结构对成像性能的影响,计算系统的自适应变焦能力及相应像平面可移动范围。结果表明:系统成像的视场角随着基底曲率的增大而增大。相比于非均匀透镜阵列,均匀透镜阵列可明显降低系统的离焦像差。适当减小子透镜单元尺寸,也可以达到降低边缘透镜离焦像差的目的。当物距或者接收器位置发生改变时,通过调整子透镜单元焦距降低系统的离焦像差。系统接收器可移动范围为1.9 mm~15 mm。 相似文献
2.
3.
4.
5.
6.
本文提出了一种有效的微透镜阵列填充因子快速检测方法.文章从光的标量衍射理论出发,分析了连续浮雕微透镜阵列的衍射光斑分布与透镜子口径、透镜矢高之间的关系,推导出了微透镜阵列远场衍射光斑的理论模型,用该模型对不同填充因子的微透镜阵列为例进行计算机模拟分析,并且搭建了实验装置来获得实际的衍射光斑.结果表明,模拟光强分布与实际衍射光斑相当接近,在此基础上给出了微透镜衍射光斑分布与填充因子之间的半定量关系,为微透镜阵列的快速检测提供了一种有效手段.这种方法可以实现微透镜阵列的准确、简单、低成本的填充因子检测,极大地提高了生产效率,满足了实际测试的要求. 相似文献
7.
《纳米技术与精密工程》2017,(4)
微透镜阵列由于具有质量轻、结构小、视场大、分辨率高等优点,被广泛应用于光学领域.微注塑成型是实现其低成本批量生产的主要方法.如何高效、高精度、低成本加工模芯一直是研究的重点与难点.本文在传统微透镜阵列加工路径基础上,提出了一种正弦过渡加工路径,并对其过渡正弦的振幅和波长进行了分析,该方法有效避免了传统加工路径的不连续与突变问题.进行了正弦过渡路径优化设计和实际对比加工实验,实验结果表明该路径优化方法能有效地消除加工表面纹理,提高表面质量和加工效率. 相似文献
8.
9.
10.
球面投影光刻物镜的设计 总被引:2,自引:2,他引:0
针对人工晶体或隐形眼镜的面形上连续浮雕结构加工的特点,本文介绍了基于空间光调制器(DMD)曲面投影光刻物镜系统的设计方法.根据其成像面为曲面的特点,根据光学设计理论多次利用弯向物方的弯月形负透镜结构进行场曲校正,同时运用光的衍射原理优化设计物镜系统的数值孔径以消除DMD投影过程中的栅格效应. 运用ZEMAX工程光学设计软件对系统进行了模拟、优化,并对优化后的结果进行了分析.对于设计实例利用上述设计原则给出了设计结果,工作波长为g线(峰值波长λ=436nm),像面曲率r=22.5mm,视场φ6mm,数值孔径NA=0.1,分辨力为7.8 μm(64Ip/mm)时的光学调制传函值>0.8,畸变<±0.05%. 相似文献
11.
By exploring micro-optical design principles and technology, we have developed an artificial apposition compound eye. The overall thickness of the imaging system is only 320 microm, the diagonal field of view is 21 degrees, and the f-number is 2.6. The monolithic device consists of an UV-replicated microlens array upon a thin silica substrate with a pinhole array in a metal layer on the back side. The pitch of the pinholes differs from that of the lens array to provide individual viewing angle for each channel. Theoretical limitations of resolution and sensitivity are discussed as well as fabrication issues and compared with experimental results. A method to generate nontransparent walls between optical channels to prevent cross talk is proposed. 相似文献
12.
In this research, a unique freeform microlens array was designed and fabricated for a compact compound-eye camera to achieve a large field of view. This microlens array has a field of view of 48°×48°, with a thickness of only 1.6 mm. The freeform microlens array resides on a flat substrate, and thus can be directly mounted to a commercial 2D image sensor. Freeform surfaces were used to design the microlens profiles, thus allowing the microlenses to steer and focus incident rays simultaneously. The profiles of the freeform microlenses were represented using extended polynomials, the coefficients of which were optimized using ZEMAX. To reduce crosstalk among neighboring channels, a micro aperture array was machined using high-speed micromilling. The molded microlens array was assembled with the micro aperture array, an adjustable fixture, and a board-level image sensor to form a compact compound-eye camera system. The imaging tests using the compound-eye camera showed that the unique freeform microlens array was capable of forming proper images, as suggested by design. The measured field of view of ±23.5° also matches the initial design and is considerably larger compared with most similar camera designs using conventional microlens arrays. To achieve low manufacturing cost without sacrificing image quality, the freeform microlens array was fabricated using a combination of ultraprecision diamond broaching and a microinjection molding process. 相似文献
13.
Effective formation method for an aspherical microlens array based on an aperiodic moving mask during exposure 总被引:2,自引:0,他引:2
An aperiodic mask design method for fabricating a microlens array with an aspherical profile is proposed. The nonlinear relationship between exposure doses and lens profile is considered, and the select criteria of quantization interval and fabrication range of the method are given. The mask function of a quadrangle microlens array with a hyperboloid profile used in the infrared was constructed by using this method. The microlens array can be effectively fabricated during a one time exposure process using the mask. Reactive ion etching was carried out to transfer the structure into the substrate of germanium. The measurement results indicate that the roughness is less than 10 nm (pv), and the profile error is less than 40 nm (rms). 相似文献
14.
15.
We report the simultaneous multipoint fabrication of polymer rods by the femtosecond laser processing of a negative photoresist using a microlens array (MLA). The rods were periodically arranged in the form of an array corresponding to the MLA and free-standing on a glass substrate. The use of a photomask enabled us to define the contour of the rod array. Furthermore, sample translation techniques were demonstrated for the effective fabrication of large-area structures. 相似文献
16.
Dai Q Rajasekharan R Butt H Won K Wang X Wilkinson TD Amaragtunga G 《Nanotechnology》2011,22(11):115201
A novel transparent liquid-crystal-based microlens array has been fabricated using an array of vertically aligned multi-wall carbon nanofibers (MWCNFs) on a quartz substrate and its optical characteristics investigated. Electron beam lithography was used for the catalyst patterning on a quartz substrate to grow the MWCNF array of electrodes. The structure of the electrode array was determined through simulation to achieve the best optical performance. Both the patterned catalyst and growth parameters were optimized for optimal MWCNF properties. We report an in-depth optical characterization of these reconfigurable hybrid liquid crystal and nanofiber microlens arrays. 相似文献
17.
Kulishov M 《Applied optics》2000,39(20):3509-3515
Although the concept of an artificial compound eye has been discussed in the literature, its optical arrangement has never been widely adopted for optical design. A design is presented for a tunable gradient-index microlens array, believed to be new, induced electro-optically inside a cylindrical shell. The transparent electrodes on the both sides of the shell are positioned such that the electrodes on the opposite side compensate the phase delay from the electrodes on the front side for a normally incident plane wave, thus suppressing the intrinsic electrode diffraction for the device without applied voltage. The original technique of the electric field calculation was developed to analyze the induced refractive index inside the shell for two types of electro-optic (EO) ceramics: with linear and with quadratic EO effects. For the linear effect it was shown that for given EO coefficients, electric field strength and intrinsic refractive index, the electrode number should exceed a certain amount to make the focal distance less than the cylinder radius. The quadratic effect provides higher sensitivity to the type of the diffracted wave polarization. It was shown how the quadratic coefficient ratio R(12)/R(11) affects the focal-length difference between TE and TM light polarization. 相似文献
18.
A recent improvement of a 2-D array of distributed-index (DI) planar microlenses is presented to demonstrate a 2-D integrated optical component using a planar microlens array. These components are made by stacking planar microlens arrays and other planar optical devices. The improved planar microlens has f = 2.0 mm, a N.A. = 0.23, and its spherical aberration is very small. A fiber coupler is demonstrated. From a preliminary experiment, it is shown that the coupling loss of each channel is <0.5 dB for coupling 50-micron core DI fibers. 相似文献