An optimized heat management affects performance and Lifespan of white light of LEDs. However, the temperature stability for secondary optics often neglected. The Fraunhofer Application Center for inorganic phosphors has developed an approach over infrared thermography, with which the assesment of heating of secondary rate LED optics is possible.
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| Infrared thermography: allows estimating about the temperature distribution within a secondary optics. ThePicture shows the cross-section of an LED. |
The higher temperatures may also have an effect on the secondary image, which is often neglected in thermal management. Particularly critical is when the secondary optics is made of plastic. The heat resistance (stability of form ) of materials commonly used in secondary optics such as polymethyl methacrylate (PMMA) and polycarbonate (PC) lie between temperatures of 95 and 122 ° C. A team from the İnstitutr has developed a method to measure the exact temperature profile of secondary optics. The optics are contactlessly analyzed and evaluated via infrared thermography at the maximum permissible power and temperature of the LED in combination with a high-power LED module. Measurements made on the samples of PMMA and PC showed that this method can be used to precisely determine the temperature on the inner surface in particular. This makes estimating which materials are suitable for which operating temperatures possible. /
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