In developing a daylighting system, the overall system efficiency is crucial. In the daylighting system, whether the light propagates parallel strongly affects the efficiency. In this paper, we simulate a multicurvature lens to collimate rays propagated from different angles. We describe a method based on a freeform microlens array, which increases transmission efficiency. Results show that with the freeform microlens array collimator, the light propagates provide at least 50.26% parallel and the efficiency increases by 24.76%, enhancing the core values of the daylighting system in building illumination.
© 2014 Optical Society of America
Original Manuscript: May 2, 2014
Manuscript Accepted: June 9, 2014
Published: July 29, 2014
Kung-Jeng Wang, Hsi-Chi Chen, Xiao-Rong Wu, Pao-Hung Lin, Yi-Yung Chen, Chia-Min Lin, Yin-Ti Chen, Allen Jong-Woei Whang, and Chun-Han Chou, "Innovative design of light collimator based on a freeform microlens array," Appl. Opt. 53, H35-H43 (2014)