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摘要:
In recent years, light emitting diodes (LEDs) have entered the lighting market, offering consumers performance and features exceeding those of traditional lighting technologies. LEDs (light-emitting diodes) are becoming more common in safety signals for railroad, highway, automotive, and many other applications. In addition to having a longer life and greater durability than incandescent bulbs, LEDs are much more energy efficient than their incandescent counterparts. Since the heat from the junction must be dissipated into the ambient somehow, changing the ambient temperature affects the junction temperature and hence the emitted light. When the LEDs are used in the railway or traffic signals, the optical proprieties of these have to maintain more rigorous specifications. Therefore the development of signals using LED as light source, able to respect intensity specifications, is not simple. In this paper, we describe problems of the temperature dependent changes of LED intensity and color shift. Besides we will introduce an innovative technique, that we have developed, to allow the use of the LEDs in applications with rigorous specifications.
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白光LED及其驱动
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文献信息
篇名 LED Applications in Railway Signals: Wavelength and Intensity vs Temperature Variation
来源期刊 交通科技期刊(英文) 学科 医学
关键词 LED Temperature-Dependency LED INTENSITY SHIFT RAILWAY Signal
年,卷(期) 2012,(1) 所属期刊栏目
研究方向 页码范围 78-83
页数 6页 分类号 R73
字数 语种
DOI
五维指标
传播情况
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研究主题发展历程
节点文献
LED
Temperature-Dependency
LED
INTENSITY
SHIFT
RAILWAY
Signal
研究起点
研究来源
研究分支
研究去脉
引文网络交叉学科
相关学者/机构
期刊影响力
交通科技期刊(英文)
季刊
2160-0473
武汉市江夏区汤逊湖北路38号光谷总部空间
出版文献量(篇)
254
总下载数(次)
0
总被引数(次)
0
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