標題: An endoscopic system adopting a liquid crystal lens with an electrically tunable depth-of-field
作者: Chen, Hung-Shan
Lin, Yi-Hsin
光電工程學系
Department of Photonics
公開日期: 29-七月-2013
摘要: Conventional endoscopic systems consisting of several solid lenses suffer from a fixed and limited depth-of-field (DOF). For practical applications, conventional endoscopes mechanically change the distance between the solid lenses of a lens module in order to change the focusing plane and DOF to see clearly in a scene. In this paper, we demonstrate an electrically tunable endoscopic system adopting a liquid crystal lens. By means of tunable focusing properties of the LC lens as a positive lens and a negative lens, the object at different objective distances can be imaged to the image sensor clearly and the corresponding depth-of-field can also help to enlarge the total spatial depth perception in a scene. The optical mechanism is discussed. In the experiments, under adjustment of three discrete lens powers of the LC lens, the viewing range or total spatial depth perception of the endoscopic system is from 76.4 mm to 12.4 mm which is 2x improved compared to the conventional one without LC lens. We believe this study can be extended to the applications of industrial and medical endoscopes. (C) 2013 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.21.018079
http://hdl.handle.net/11536/22599
ISSN: 1094-4087
DOI: 10.1364/OE.21.018079
期刊: OPTICS EXPRESS
Volume: 21
Issue: 15
起始頁: 18079
結束頁: 18088
顯示於類別:期刊論文


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