Dissertation/ Thesis
The study of the precise optical model of multi-LEDs
| العنوان: | The study of the precise optical model of multi-LEDs |
|---|---|
| Alternate Title: | 多LED光源結構的精準光學模型之研究 |
| المؤلفون: | Wei-ting Chien, 簡瑋廷 |
| Thesis Advisors: | Ching-cherng Sun, 孫慶成 |
| سنة النشر: | 2010 |
| المجموعة: | National Digital Library of Theses and Dissertations in Taiwan |
| الوصف: | 98 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. |
| Original Identifier: | 098NCU05614060 |
| نوع الوثيقة: | 學位論文 ; thesis |
| وصف الملف: | 92 |
| الاتاحة: | http://ndltd.ncl.edu.tw/handle/81965081328963955522 |
| رقم الانضمام: | edsndl.TW.098NCU05614060 |
| قاعدة البيانات: | Networked Digital Library of Theses & Dissertations |
| الوصف غير متاح. |