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LED Applications in Railway Signals: Wavelength and Intensity vs Temperature Variation

机译：LED在铁路信号中的应用：波长和强度与温度变化的关系

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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.
机译：近年来，发光二极管（LED）进入照明市场，为消费者提供超越传统照明技术的性能和功能。在铁路，公路，汽车和许多其他应用的安全信号中，LED（发光二极管）正变得越来越普遍。除了具有比白炽灯泡更长的寿命和更长的耐用性，LED还比白炽灯泡具有更高的能源效率。由于来自结的热量必须以某种方式散发到环境中，因此改变环境温度会影响结温度，从而影响发射的光。在铁路或交通信号灯中使用LED时，这些LED的光学特性必须保持更严格的规格。因此，要使用能够满足强度规格要求的，以LED为光源的信号，开发起来并不容易。在本文中，我们描述了LED强度和色移随温度变化的问题。此外，我们将介绍一项已开发的创新技术，以允许在严格规格的应用中使用LED。

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