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    題名: 接觸式膠囊內視鏡之照明系統設計;Design of illumination system in contact capsule endoscope
    作者: 馮漢民;Han-Min Feng
    貢獻者: 光電科學研究所
    關鍵詞: 照明系統;錐狀鏡;膠囊內視鏡;illumination system;cone mirror;capsule endoscope
    日期: 2009-07-09
    上傳時間: 2009-09-22 10:37:09 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要:   本文主要於研究接觸式膠囊內視鏡照明系統之相關問題,由於LED的發光強度隨角度之變化而有所不同,亦有其相對應之配光曲線;因此其投光之情形未必能均勻地分布在接觸式膠囊內視鏡周圍之目標物面,而此會造成物面上呈現過暗或過亮之問題。不論光源是以直接性或間接性之方式,經由錐狀鏡而反射至影像感測元件,皆會造成過曝之光亮點,而降低整體之影像品質。   針對此問題,在此利用光機模擬軟體ASAP來優化此照明系統;對於接觸式膠囊內視鏡之照明系統進行設計、模擬與分析;從原始的膠囊模型,逐步設計出增減LED之個數、LED不同之排列位置、LED不同之擺放角度與幾何形狀,或是調整錐狀鏡與LED之相對距離等之因素,以消除不必要之雜散光而使系統整體之照明均勻度提升,經由一組接觸式膠囊內視鏡之照明系統最佳化設計,能提升整體照明系統之效能。於本研究中,接觸式膠囊內視鏡之照明系統的最佳化設計,由原始之照明均勻度0.128提升至0.603,大幅地增進了接觸式膠囊內視鏡之成像品質。   未來,若接觸式膠囊內視鏡可為產業界作進一步地探究應用,或是將接觸式膠囊內視鏡系統應用於新穎的醫學檢測技術之中,接觸式膠囊內視鏡之光學設計必定為系統最重要之關鍵技術;若再配合最佳化設計,方可增進接觸式膠囊內視鏡之核心價值。  This paper is researching about the illumination system in contact capsule endoscope (CCE).  It is difficult to obtain the uniform illumination on the observed object because the light intensity of LED will be changed along with its angular displacement and same as luminous intensity distribution curve.  As the location of light source (i.e., LED) is approaching imaging lenses which light source incidents into the cone mirror and then the reflected light will be reflected through the lenses to enter CMOS sensor directly.  On the other, the strong reflection rays from the transparent view window (TVW) will incident into the cone mirror and then the reflected light will be reflected by cone mirror indirectly and through the lenses to enter CMOS sensor.   The result of above reasons is bound to make over-blooming on the image plane.  These over-blooming will cause image to bring up non-uniform, decreasing image quality. Regarding for this problem, I use the optical design software which is Advanced Systems Analysis Program (ASAP) to build a photometric model for the optimal design of LED illumination system in CCE.  According to original model of CCE,  I set the several key parameters that are LED quantities, location of LED, geometric shape of LED, tilt angle of surface of LED, distance between LED and cone mirror etc.  That is why to decrease the stray light and increase the whole illumination uniformity of CCE.  It is major goal to raise the efficiency of CCE system in this paper; hereby I design the best case in illumination system of CCE to get it.   The optimal case is designed by the axial displacement of PCB, radial displacement of LED, tilt angle of surface of LED, divergence angle of LED, rotation angle of LED etc.  It can improve illumination system and advance the image quality.  It can also help doctor to make a diagnosis and treatment by vivo picture more correct.  In this paper, the optimal design of illumination uniformity in the CCE is form origin 0.128 up to optimum 0.603 and it would advance the image quality of CCE greatly.  Finally, I expect this latest design of the luminous system with very high practicability for examinations, diagnosis or therapies in medical science.   In the future, if the optimal design of CCE will be further using in industrial field or in novel medical detection technology at the same time optical design of CCE will greatly increase its core value.
    顯示於類別:[光電科學研究所] 博碩士論文

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