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

摘要

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.

原文英語
主出版物標題Light-Emitting Diodes
主出版物子標題Research, Manufacturing, and Applications XI
DOIs
出版狀態已發佈 - 2007 五月 25
事件Light-Emitting Diodes: Research, Manufacturing, and Applications XI - San Jose, CA, 美国
持續時間: 2007 一月 242007 一月 25

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
6486
ISSN(列印)0277-786X

其他

其他Light-Emitting Diodes: Research, Manufacturing, and Applications XI
國家美国
城市San Jose, CA
期間2007/01/242007/01/25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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