不同型式光纖與集光器搭配之效率測試

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彭彥凱(Yen-kai Peng) 查詢紙本館藏

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能源工程研究所

論文名稱

不同型式光纖與集光器搭配之效率測試
(Test of the Efficiency of the Concentrator with Different Types of Optical Fiber)

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摘要(中)

太陽集光器在太陽能應用佔有重要的地位，近年來它的應用朝向將光經由光纖傳導至室內再轉換成其他形式能量，這種方式有其彈性但其實用性尚待評估。因此本文探討使用拋物面碟式集光器搭配光纖，將集光器聚焦的光經由光纖傳輸到遠端的可行性。
光纖—集光器的主要兩個光學元件為光纖與反射鏡組（做為集光器），反射鏡組包含拋物面主反射鏡與平面二次反射鏡。目前光纖的光學特性和材料性質與集光器的特性在搭配時會有限制，特別是主反射鏡的直徑、曲率大小與光纖數值孔徑等參數，此外操作溫度亦會影響輸出功率，這些因素都會影響光纖的光傳輸效率。因此本文使用兩種反射鏡組搭配三種不同形式的單光纖（塑膠和石英）與兩種石英光纖束，光纖的長度可達150 cm。由量測與估算的光傳輸功率計算光傳輸效率。在單光纖形式中，有緩衝層石英光纖的傳輸效率最好，光纖傳輸長度為120 cm的光傳輸效率為77%-80%。而光纖束目前製作技術不理想，單光纖製作成光纖束後，光強度便會大幅下降。本文亦對石英光纖的輸出功率受溫度效應作探討，在低操作溫度範圍(25oC - 95oC)，發現此溫度範圍內石英光纖輸出功率穩定。

摘要(英)

Solar concentrator is an important device in the application of solar energy, and one of its applications is utilize the optical fiber to transport the concentrated light into the indoor for converting the solar energy to other form of energy. Such arrangement provides flexibility and yet its practical implementation remains to be investigated. Thus, this work is a feasibility study of transmitting the concentrated light from a concentrator through the optical fiber.
Present arrangement of the fiber-concentrator consisted of a parabolic dish (the primary mirror) and a flat secondary mirror, and various forms of optical fiber (plastic and quartz) up to the length of 150 cm. There is some mismatch between the optical and material characteristics of fibers and the mirrors used in the concentrator, especially the diameter and the curvature of primary mirror, and the numerical aperture of the fiber. In addition, the operating temperature will affect the output power from the fiber. This study uses two types of primary mirror, three types of single fiber and two modes of quartz-fiber bundle. The transmitting efficiency is calculated from both the measured and predicted light power through the light path of the concentrator-fiber. In the case of single fiber, the quartz-fiber with the buffer layer has best efficiency; it’s efficient is 77-80% for a 120-cm length of transmitting length. Due to imperfect fabrication of the fiber bundle, the light intensity of the fiber bundle drop significantly compare with that of the single fiber. Finally, the measured light power was stable in the range of low operating temperature (25oC - 95oC).

關鍵字(中)

★ 傳輸效率
★ 功率量測
★ 光纖束製作
★ 太陽集光器

關鍵字(英)

★ power measurement
★ solar concentrator
★ fabrication of fiber bundle
★ transmitting efficiency

論文目次

中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖目錄 VI
表目錄 IX
符號說明 X
第一章緒論 1
1.1研究動機 1
1.2集光器與光纖介紹 5
1.3文獻回顧 7
1.4研究目的 8
第二章光纖基礎理論 16
2.1全反射現象與光纖構造 16
2.2光纖數值孔徑 17
2.3光纖傳遞能量的損失 18
2.4光纖材料與耐熱 21
第三章集光系統設計與製作 25
3.1反射鏡的選擇和配置 25
3.2提高光纖數值孔徑與能量傳送效率的方法 27
3.2.1 光纖燒結 27
3.2.2光纖去除緩衝層 30
3.3 製作光纖束 31
3.4 實驗步驟與方法 33
第四章結果與討論 44
4.1系統效率與集光率 44
4.1.1中間有開口的主反射鏡系統 44
4.1.2無開口的主反射鏡系統 49
4.2溫度對光纖傳送效率的影響 51
4.3 系統效率與集光率比較 52
4.4 集光系統的改進 56
第五章結論與建議 72
5.1 結論 72
5.2 建議 74
參考文獻 76

參考文獻

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指導教授

吳俊諆(Jiunn-Chi Wu)

審核日期

2007-7-11

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