Simulation, Design And Experimental Analysis Of The Optical Structure Of Small-signal Level Led Light Package

Since their development in the mid-1960's, the luminous efficiency and the light emitting intensity and range of available output wavelengths of light-emitting diodes (LEDs) have increased to such a degree that it is profitable enough to be used for design LED solid light. And number of new applications for LED sources are now being pursued. This kind of LED light have been prove to be having many excellent virtues and was predicted to be having the possibility of leading the lighting industry into a new revolution. For these now and future applications, it is an enormous critically important to design the illumination optics to achieve high flux-transfer efficiency, of light-emitting diode (LED).In order to meet the design and optimization requirement of developing LED light, an effective method that is befitting in this work should be found out. In this article, the traditional LED's light distribution is obtained through carrying out simulation of LED's optical encapsulated structure by means of Monte Carlo method but not geometry optics method. The Monte Carlo LED simulation model is abstracted as dot light source, reflecting bowl, interface of epoxy resin and air. Light is treat as photons' physical reactions with every possible part of whole LED's optical encapsulated structure after emitting from the dot light source. These reactions include photons' reflection and refraction on interface, absorption by epoxy resin material or wear down by interface of optical structure. Every stochastically emitted photo follows the physical optics and geometry optics rules and finally gets out of encapsulation and then is collected in a screen. When a large number of photons' travel routes and locations of reaction with screen were determined, the light distribution pattern of correspondent LED's optical encapsulated structure would be presented. And the average illumination intensity can be figured out through statistic method.Here, some kinds of traditional LED's optical encapsulated structure were simulated using Monte Carlo method. And experiments were performed using the correspondent LED's optical encapsulated structure with the same conditions just like what were used in simulation. The dome-top,plane-top; large-reflective bowl, small-reflective bowl; wild-degree bowl, narrow-degree bowl; deep assembling, middle assembling and low assembling LED tubes were simulated and experimentally measured for comparison. Some conclusions can be drawn that the simulation results fit the experimentation results well in the light distribution. This testified that Monte Carlo method is one of the effective tools for LED light's optical design. There are some differences between simulation and experiment results in the patterns' distribution scale for there are still some conditions' differences just as characteristics of encapsulated materials and shapes of encapsulated structure. It is accurate enough for analyzing and finding out the relations between light distribution and correspondent optical structure and directing the right ways for designing more effective LED light's new optical structure. The optimization and construction of random figures, how to construct and how to describe the LED MC model in mathematics to make figuring simpler, how to judge the validation of simulation results, how to optimize a LED light's optics structure is discussed detailed in this article.