Design and simulation of bionic compound eye with electrowetting liquid lens

Zhao Rui; Peng Chao; Zhang Kai; Kong Meimei; Chen Tao; Guan Jianfei; Liang Zhongcheng

doi:10.12086/oee.2021.200120

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Zhao R, Peng C, Zhang K, et al. Design and simulation of bionic compound eye with electrowetting liquid lens[J]. Opto-Electron Eng, 2021, 48(2): 200120. doi: 10.12086/oee.2021.200120

Citation:

Zhao R, Peng C, Zhang K, et al. Design and simulation of bionic compound eye with electrowetting liquid lens[J]. Opto-Electron Eng, 2021, 48(2): 200120. doi: 10.12086/oee.2021.200120

Design and simulation of bionic compound eye with electrowetting liquid lens

Center of Optofludic Technology, College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunication, Nanjng, Jiangsu 210023, China

Fund Project: National Natural Science Foundation of China (61775102, 61905117) and Foundation Enhancement Plan Technical Area Fund Project (2019-JCJQ-JJ-446)

More Information

Corresponding authors: Zhao Rui, E-mail: zhaor@njupt.edu.cn; Liang Zhongcheng, E-mail: zcliang@njupt.edu.cn

Received Date 13 April 2020

Revised Date 14 July 2020

Published Date 15 February 2021

Abstract

Abstract

To solve the problem that the bionic compound eye system can't zoom adaptively, a zoomable bionic compound eye system based on electrowetting-on-dielectric liquid lens cambered array is proposed. The influence of the system structure on the imaging performance is analyzed, and the adaptive zoom capability of the system and the moving range of the corresponding image plane are calculated. The results show that the field of view angle increases with the increase of the curvature of the base. Compared with the non-uniform lens array, the uniform lens array can significantly reduce the defocus aberration of the system. Reducing the size of the lens unit can also decrease the defocus aberration of the edge lens. When the object distance or receiver position is changed, the defocus aberration of the system will be reduced by adjusting the focal length of the lens unit. The movable range of the system receiver is 1.9 mm~15 mm.
- optical design /
- electrowetting-on-dielectric /
- compound eye /
- liquid lens array /
- variable-focus

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References

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Overview

Overview

Overview: Insect compound eyes are natural multi-aperture curved optical system with large field of view, small size, high sensitivity, sensitivity to moving objects, and real-time image analysis and processing. Bionic compound eye system is an optical imaging system designed based on the imaging principle of insect compound eyes, which has been widely used in industrial detection, security, autonomous navigation, robot, and other fields.

Because the compound eye system has the characteristics of compact structure, high sensitivity and large field of view, it has great development and application potential. However, the traditional compound eye imaging system can not automatically zoom, and there is a mismatch between the compound eye system and the plane detector. In order to solve the problem that the compound eye system can not zoom adaptively and does not match the planar detector, this paper proposes a bionic compound eye system with adaptive zoom based on the cambered array of electrowetting-on-dielectric liquid lens. In the design of this compound eye system, the adaptive focusing ability of the electrowetting-on-dielectric liquid lens is applied. For the lens units in different positions, the shape of the liquid-liquid interface can be changed by adjusting the voltage of the liquid lens, to adjust the focal length of the lens unit, so that the lenses at different positions can image on a same plane. In this paper, the effects of the curved substrate, lens unit size, and ray incidence angle on imaging performance are analyzed through simulation. The simulation results show that the field of view angle of system imaging increases with the increase of the base curvature. After that, two kinds of compound eye systems with different arrays of uniform and non-uniform are compared by simulation analysis. By analyzing the spot diagram of simulation, compared with the non-uniform lens array, the uniform lens array can significantly reduce the defocus aberration of the system. Finally, the adaptive zoom capability of the bionic compound eye system is studied by analyzing the change of object distance or image distance. The results show that when the object distance or image distance changes, the focal length of the lens unit will be adjusted by controlling the working voltage, so that the image is refocused on the receiving detection surface, and the moving range of the image receiving surface is 1.9 mm~ 15 mm. The research in this paper will promote the development of the bionic compound eye system and provide theoretical basis for the rational use of liquid lens.