未使用二次元件的高倍率及均勻化菲涅爾鏡片

Abstract

在此論文中，一個聚光鏡被設計使太陽能均勻及集中。此聚光鏡只有折射稜鏡的陣列。此聚光鏡採用為折射型的菲涅爾透鏡由於角度公差比反射型大。此菲涅爾透鏡由許多間距為0.3mm的微小稜鏡所組成。為了使照度均勻，在菲涅爾聚光鏡上的稜鏡必須均勻的聚焦在接受器上的不同位置，結果可以達到非常高的均勻度及效率。最後，此菲涅爾透鏡可以達到均勻度為14.6。且在不使用二次光學元件的情況下，可接受角(光學效率衰減到正向入射的90%光學效率的角度)能達到0.305度。倍率(透鏡面積除以太陽能電池面積)為1018倍。能量為最大值一半(半強度)時的範圍1.4mm。

In the thesis, a single concentrator was designed to homogenize and concentrate the solar energy. The proposed concentrator only consisted of an array of the refraction prisms. The concentrator is adopted as the refractive type of the Fresnel lens due to the larger angular tolerance than the reflective type. The Fresnel lens is composed of several small micro refraction prisms with pitch of 0.3 mm. In order to homogenize the irradiance, all pitches of the Fresnel concentrator focus on the different position of the receiver, resulting very high uniformity and high transmission efficiency. Finally, the Fresnel lens achieves the uniformity of U is 14.6. A half acceptance angle of 0.305 degree is achieved without using additional secondary optics element. The concentration ratio is 1018. Full Width at Half Maximum (FWHM) of illumination distribution is 1.4 mm.