- 學位論文
長距離日夜安全監控系統整合開發
Development and study on long distance day-and-night security monitoring system
摘要
近年來，安全監控系統進入高畫質數位化及雲端跨領域整合的時代。畫質的清晰程度、系統可觀測的距離遠近以及在夜間時是否如日間般清楚辨識景物成為了探究安全監控系統開發及整合的重點。考量到技術取得及整合方便性和成本控制，主動紅外投射技術對於以矽元素為主要材質的影像感測器來說，其反應頻譜在紅外波段有著相當高的響應。因此在低光源、低照度的環境下相當適合搭配可見光作為輔助光源的使用以及感測使用。本文將討論運用在遠距離紅外投影暨光形調整技術，設計模擬在低照度環境下投射出符合影像感光元件的幾何長寬比例以貼近實務上需求。 紅外投影系統會搭配取像系統作為使用，其變焦鏡頭的光學倍率為10倍至30倍不等；在夜間時利用近紅外波段，而日間則使用濾光片切換至可見光波段利於觀察。本論文以垂直腔面射型雷射(VCSEL)作為光源並設計二次光學元件來加以應用。光源經過元件準直後再加入尺寸比例改變(anamorphic)後能投射出準直且光束截面比例16:9之光形，接著計算並投射12倍光學變焦鏡頭在各焦段所對應監控面積的陣列投射系統，其工作距離為100 m ~ 200 m遠，可更有效利用燈源並且節省40%能量。
並列摘要
Security system has entered the era of integrated high-definition image quality digital network in recent years. The focus of development and integration are clarity of image, working distance of investigation, and clear night monitoring. In consideration of technique, cost, and compatibility, the active infrared illumination is suitable for high spectral response of silicon-based-solid-state image sensor especially in low-light-level environment. This Thesis will explore the long distance IR anamorphic lighting technique, designing and simulating the aspect ratio and scheme size, which is formed by the collimating lens and projecting system, to be matched the Full-HD aspect ratio of the image sensor. The video monitoring system which is consist of 10x to 30x optical zoom lens operates with IR lighting system during the night time. The IR cut filters are used in daytime for solid-state image sensors so that the interference of the invisible noise can be removed. The thesis is to devise secondary optical lens and long distance projecting array system with VCSEL (Vertical Cavity Surface Emitting Laser). The 16:9 beam pattern which is projected to 100 meters away by the secondary lens is about 5 degree. In comparison with the majority of current products in the marketing, the collimated and elliptical radiant pattern is not only lower cost but higher optical efficiency.