用於晝光收集之非對稱光耦合器之數值模擬與實驗之比較

Comparison of numerical simulation and experiments of asymmetric light couplers for sunlight collection

郭日升(Jih-Sheng Kuo)

指導教授 ： 徐巍峰

國立臺北科技大學/電資學院/光電工程系研究所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00724

摘要

在這全球升溫、能源持續短缺的情況下，節能減碳成為全人類最重要的問題，而節能減碳中，使用永續能源為其一解決方案，永續能源中太陽能最為環保，而若能夠導入日光，使用日光照明能夠節省非常多的能源，日光照明所需的系統由集光、光引導、光輸出等元件組成。
太陽光照明系統必須提供足夠的太陽光，需要使用大量的集光器和光耦合器，因此在日光照明系統中，效率為一個很大的關鍵，尤其是將日光直接應用在建築物的室內照明，若能夠減少傳輸時日光的損失，那麼將可以提高日光照明的效果，但現今極少討論到傳輸和集光時的損失問題。
根據本文提出非對稱光耦合器運算公式，模擬結果得出在光線由主幹進入耦合區時，耦合角度越大，進入角度越小，獲得之效率越高。光線由支幹進入耦合區時，若耦合角度越大，光線進入角度越大，獲得效率越高，而本論文之運算公式相較文獻之運算公式，在5°時總效率值誤差0.17%，其利用程式計算速度快約273倍，能更快知道進入非對稱光耦合器耦合區的光線是否能通過，並且可得知其位置與角度，而經過模擬數值與實際實驗數值之比較，將其正負角度加總取平均，並進而整理整個耦合角度效率模擬與實驗數值，實驗數值較模擬數值下降約一半，但其曲線趨勢相符，驗證運算公式之正確性。

關鍵字

光耦合器 ； 日光照明 ； 耦合效率 ； 非對稱耦合

並列摘要

Because of global warming and energy shortage, energy saving and carbon reduction are the most important problem of all human beings. The solution to reduce carbon emissions is to use green energy in which solar energy is the most environment-friendly. By importing sunlight into houses, we can save a lot of energy. Solar lighting system is composed of collectors, light couplers, and light exits.
Daylight illumination system must provide sufficient sunlight, especially in indoor lighting of the building. The key to increase the amount of accumulated sunlight is to use a large number of light collectors and optical couplers. If we can reduce the transmission loss of sunlight, we will be able to increase the amount of daylight. However, there are not many researches for solving the light transmission loss.
By using the simulation results show that the efficiency increases as the incident angle decreases for the light traveling form the trunk into the coupling region with a large coupling angle. On the other hand, the efficiency increase as the incident angle increases for the light traveling form the branch into the coupling region with a large coupling angle. Compared with the previous work by Shen, the simulation results conducted by the formulas presented in the thesis only exited 0.17% difference of efficiency of the coupler with coupling angle 5°. Excerpt for the slightly difference of coupling efficiency, the calculation speed was increased about 273 times faster than the previous work. We can identify whether enter light pass the coupler region or not. After we compared the numerical simulation and experimental results, we found that the efficiency of the numerical simulation of the experimental decreased by about half, but the trend matched. According to the result of the experiment, it showed the correctness of this calculation formula.

並列關鍵字

Light coupler ； daylighting ； coupling efficiency ； asymmetric light couplers

參考文獻

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