The Study of Distortion in Image Systems

• Main Authors: Chiu, Chien-Kuo, 邱建國
• Other Authors: Hsu, Tzu-Fang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/03970447072283446436

碩士 === 國立屏東大學 === 應用物理系碩士班 === 103 === In this thesis, we discuss how to control the distortion in an image system by simulations and experiments. To analyze the single lens system, the fact of that the distortion of image was proportional to the image height. As a result, the curvature radius of each refractive surfaces of a lens and the position of aperture stop of the system would influence the distortion rate, especially the position of aperture stop. The influence of the position of aperture stop was also been experimentally observed in a single lens system. In the simulated double lens system, the aperture stop was also the most important issue that leaded to the distortion of image. In a symmetrical curvature radius system, the center of the lens system was the best position of aperture stop to reduce the distortion rate. However, in a nonsymmetrical curvature radius system, the aperture stop should be located at the positon between two lenses but near the lens with shorter focal length of the double lens system to effectively reduce the distortion. We also demonstrated these results by setting up an effective lens system. When the aperture stop could not be set at the position between the two lenses of a double lens system, an optical element which is added into the space between the two lenses could also reduce the distortion rate. We observed the distortion rate curves of the system that positive lens, negative lens, glass plate or micro-lens arrays were added into the double lens system. It is found that positive lens and micro-lens array which was composed of lens elements with positive focal length could reduce the distortion rate, but the glass plate and negative lens could not. The system added micro-lens array could more effective than system added positive lens to reduce the distortion rate.