Design and implementation of real-time LED spatial radiance measurement systems

Gao Wei Chang*, Zong Mu Yeh, Chia Cheng Liao


研究成果: 書貢獻/報告類型會議論文篇章


Light-emitting diodes (LEDs) have been recognized as a generation of new light sources because they possess the properties of energy-saving, environmental protection, long lifetime, and those lacking in conventional lighting. To satisfy the requirements for different applications (e.g., for large-scale displays), determining the spatial radiances of LEDs is important to identifying their viewing angle and utilizing their lighting efficiency. The objective of this paper is to build up a real-time spatial radiance measurement system for LEDs, on the basis of digital signal processing (DSP) techniques. In this paper, the system analysis is given to show the feasibility of this work. Two primary subsystems are devised to perform the real-time measurements. First, in the optoelectronic sensing and signal processing subsystem, a wide-bandwidth photodiode sensing circuit is employed to acquire optical signals at a high speed, and an automatic gain control (AGC) circuit is designed to increase the measurement range. To support high-speed data processing, a DSP-based platform is developed in the subsystem. Second, a light-source rotation scheme is used in the optomechanical subsystem. For performance evaluations, we adopt a standard calibrating light source to test and verify our system. Experimental results indicate that the proposed system gives satisfactory results.

主出版物標題Light-Emitting Diodes
主出版物子標題Research, Manufacturing, and Applications XI
ISBN(列印)0819465992, 9780819465993
出版狀態已發佈 - 2007
事件Light-Emitting Diodes: Research, Manufacturing, and Applications XI - San Jose, CA, 美国
持續時間: 2007 1月 242007 1月 25


名字Proceedings of SPIE - The International Society for Optical Engineering


其他Light-Emitting Diodes: Research, Manufacturing, and Applications XI
城市San Jose, CA

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學
  • 電腦科學應用
  • 應用數學
  • 電氣與電子工程


深入研究「Design and implementation of real-time LED spatial radiance measurement systems」主題。共同形成了獨特的指紋。