本論文乃針對應用於太陽能聚焦用菲尼爾透鏡的表面結構進行分析設計。一般凸透鏡透鏡厚度較大，因此重量無法減輕，不適用於大面積的聚焦，本文利用分段直線法與細直線分段曲線法、最佳化分段曲線法等方法設計菲尼爾透鏡，探討各種影響幾何聚光倍率、聚光效率的因素。研究結果發現中小尺寸菲尼爾透鏡(約半徑150 mm以下)利用分段直線法與細直線分段曲線法設計較為適宜，大尺寸菲尼爾透鏡(透鏡半徑500 mm)利用最佳化分段曲線法設計可以得到較高的幾何聚光倍率與聚光效率。
此外，本研究亦探討各種不同的透鏡設計對於太陽光入射角度的敏感度。發現菲尼爾透鏡的入射角敏感性在正負1.5。時，固定觀測面積可維持幾何聚光倍率為100倍，聚光效率仍達67%以上，若觀測面積隨焦點移動測量，聚光效率仍可以維持90%。

This study is concerned with the design of surface structures on Fresnel lens used for solar energy concentration. The lens thickness of the general aspherical lens is generally large so that the weight of it is not able to br reduced. Therefore, it is not suitable for large-scale lens. The concentration efficiency and the geometrical concentration ratio are of major concerns in this study. A piecewise straight-line method and a short-straight piecewise curve line method, and an optimization method of piecewise curve line method are proposed to design the Fresnel lens. Results show that the piecewise straight line method and the short-straight piecewise curve line method are particularly applicable for, the small and medium-scale Fresnel lens (the radius under 150 mm). And, the optimization method of piecewise curve line method is suitable to design the larger-scale Fresnel lens. These approaches lead to satisfactory energy efficiency and geometrical concentrate ratio.
In addition, in this study the sensitivity of Fresnel lens to the incident angle is evaluated. It is found that when the incident angle is 1.5。 and the geometrical concentration ratio is fixed at 100 times, the concentration efficiency reaches a value higher than 67%. When the irradiance map is allowed to move with focus point, the concentration efficiency can still retain a value of approximately 90%.

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