High concentration and homogenized Fresnel lens without secondary optics element

• Main Authors: Huang, Jiun-Yang, 黃峻洋
• Other Authors: Pan, Jui-Wen
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/93475931357540909256

碩士 === 國立交通大學 === 光電系統研究所 === 99 === 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.