Design of asymmetrical total internal reflection optics with microstructures for lighting museum exhibits

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• 作者：Ke-Fang Hsu ; Chih-Wei Lin ; Mei-Wen Chen ; Jung-Min Hwang…
• 关键词：Asymmetrical TIR lens ; Microstructure ; Museum lighting ; Illuminance uniformity
• 刊名：Optical and Quantum Electronics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：48
• 期：4
• 全文大小：3,123 KB
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• 作者单位：Ke-Fang Hsu (1)
  Chih-Wei Lin (1)
  Mei-Wen Chen (1)
  Jung-Min Hwang (1)
  Li-Ling Lee (1)
  
  1. Advanced Lighting Technology Department, Green Energy and Environment Research Laboratories, Industrial Technology Research Institute (ITRI), Rm. 401, Bldg. 64, 4F,195, Sec. 4, Chung Hsing Rd., Chutung, Hsinchu, 31040, Taiwan
  
• 刊物主题：Optics, Optoelectronics, Plasmonics and Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X

文摘

A high-quality museum lighting system should demonstrate optimal color rendering and high light source efficiency. In addition, an adequate lighting management system is required for energy saving and visual comfort. However, symmetrical total internal reflection (TIR) lenses typically applied in lighting fixtures are inadequate for providing a comfortable lighting experience for museum visitors. This paper presents a new optical lens that forms a novel asymmetrical triangular light distribution for improving the vertical illuminance uniformity of museum exhibits. Moreover, the proposed lens can reduce the reflective glare caused by the glass covering exhibits. Monte Carlo ray tracing simulation techniques were used to develop various lens structures and numerous microstructures, which enabled changing the light distribution from a traditional symmetrical to an asymmetrical triangle. Finally, an asymmetrical TIR lens with a microstructure surface was constructed and applied to exhibit lighting. According to the ray tracing results obtained using Tracepro simulation software and DIALux lighting design software, the asymmetrical lens formed an asymmetrical triangular light distribution with an LED light source and enhanced the illuminance uniformity by 29 %, improving the light quality of museum exhibits. The preliminary simulation results revealed that the proposed lens structure effectively improved the LED lighting quality in the museum.