Effect of eddy current inducted heating on optical property and thermostability of high power LED

Abstract

LEDs (Light Emitting Diodes) Light source due to conform to the low carbon, green and environmental protection and social development requirements, has been widely used in the field of information field, lighting, display, is the incandescent lamp, fluorescent lamp, gas discharge lamp after a new type of Light source. Many research institutions have developed with high level of LED testing equipment, but overall, the high cost of the equipment. At present, our country's national standards in the field of LED and related products is still a blank, no unified standards and test methods to regulate the industry, making the industry products are good and bad are intermingled. In the design of test system, this paper first introduces the basic theory about LED photometric measurement and measurement standards and the status quo at home and abroad, and the main optical parameters of traditional measurement methods are summarized. Then, according to the principle of digital imaging, the overall scheme of the two kinds of measurement system is presented. Therefore, this article USES the by a CCD camera and a lambert scattering screen composition, light from the LED light to the front of the screen surface, and CCD camera filmed illuminated screen. Experiment, he measured data for the system parameters in a calibration scheme. Since then, we can use two other LED light intensity distribution measurement system plan, this completes the LED the design and development of the spatial light intensity distribution measuring device, the set of instrument system can complete the LED light intensity and photometric parameters of rapid measurement, suitable for LED production testing and research.