多LED光源結構的精準光學模型之研究; The study of the precise optical model of multi-LEDs

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题名:	多LED光源結構的精準光學模型之研究;The study of the precise optical model of multi-LEDs
作者:	簡瑋廷;Wei-ting Chien
贡献者:	光電科學研究所
关键词:	腔體效率;多晶白光;中場;光學模型;mid-field;multi-chip;cavity efficiency;Optical model
日期:	2010-07-27
上传时间:	2010-12-08 14:22:05 (UTC+8)
出版者:	國立中央大學
摘要:	本論文主要著重在多LED 光源結構的精準光學模型之研究，我們將從中場擬合法做延伸性的研究，討論光學模型其中場距離行為的限制，歸納出準遠場距離約為LED 透鏡直徑的十倍。藉由中場距離的分析去修正傳統模型法之誤差，我們使用光源強度權重法來建立一個多晶白光單一封裝 LED 光學模型，並在中場距離下做驗證此精準光學模型，相關係數達99.5% 以上。而後我們將討論擴散板之光學腔體效率，建立出LED 陣列搭配擴散板之光學腔體快速計算效率之模型，並實際驗證該模型的準確性，其誤差約在5%內。 In this dissertation, we studied the precise optical model of multi-LEDs for different applications. We started from the mid-field algorithm to discuss the limitation of the midfield distance for optical model. In general, the quasi far-field distance is about 5 to 10 times of the diameter of the encapsulated lens. Based on it, a weighting factor was proposed to modify the light source in the optical model of multi-chips white LED. This optical model was also verified in several midfield distances, and then a precise model of multi-chips white LED was successfully built up. The normalized correlation coefficient is higher than 99.5%. Then we studied the efficiency of lighting cavities composed of LED arrays. A lighting cavity is a reflecting box with light sources inside, and its exit side is covered with a diffuser plate to mix and distribute light. We derived a simple but precise calculation model for the optical efficiency of diffuser plates attached to a light cavity. Finally, the model was demonstrated in different conditions experimentally. The error between calculation model and experiment is about 5% error.
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