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LED Applications in road and railway signals: is it possible to fit specifications?

机译：LED在公路和铁路信号中的应用：是否可以符合规格？

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摘要

In recent times, the transportation industry has generated a number of developments involving new technology in signaling. Important developments have involved the production of light by means of light emitting diode (LED). 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 have been used in the railway or traffic signals, the optical proprieties of these have to maintain more rigorous specifications. The junction temperature of the power LEDs affects the device's luminous flux of the device. To develop signals, using LED as light source, able to respect intensity specifications it is not simple. In fact, then shift in intensity, over the specified temperature range, can be greater than the magnitude of specification. In this paper, we describe problems of the temperature dependent changes of LED intensity. Besides we will introduce an innovative technical to allow the use of the LEDs in applications with rigorous specifications.
机译：近年来，运输行业已经产生了许多涉及信号新技术的发展。重要的发展涉及通过发光二极管（LED）产生光。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。当将LED用于铁路或交通信号灯时，这些LED的光学特性必须保持更严格的规格。电源LED的结温会影响设备的设备光通量。为了产生信号，使用LED作为光源，能够遵守强度规格并不简单。实际上，在指定温度范围内强度的变化可能大于规格值。在本文中，我们描述了LED强度随温度变化的问题。此外，我们将介绍一项创新技术，以允许在规格严格的应用中使用LED。

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