| 摘要: | 本文Fresnel lens應用之量測，主要是應用於CCFL面板、LED燈及LED路燈，並以Matlab程式來分析。在CCFL面板中，拿掉原有的擴散板、DBEF和稜鏡片，改以Fresnel lens使光源均勻化，且以CCD camera拍攝結果，將照片輸入到電腦中以程式做分析，可以看出面板均勻或不均勻。LED燈為一顆一顆，因此必須使用與量測CCFL面板時不同的重疊方式，在重疊中能發現，當Fresnel lens放在燈源上為橫的時候，其光線分佈為直的，相反的若Fresnel lens放於燈源上方時為直的，則光線分佈為橫的，於是要將LED燈做均勻化，必須採用直式加橫式的Fresnel lens。而在LED路燈量測中，沒有貼Fresnel lens的照度分佈與貼上Fresnel lens的照度分佈做比較，發現Fresnel lens雖然會減少其照度，但是可以擴大光源照射到地面的範圍，而且沒有貼Fresnel lens的照度範圍為直立型長方形，有貼Fresnel lens的則較為正方形。若是不考慮LED路燈照度峰值衰減，那麼在道路架設路燈時可以減少路燈的棧數。This research “Fresnel lens application of the measure” is mainly used in CCFL panels, LED lights and LED streetlamp, and Matlab programs to analyze. In CCFL panel, remove the diffuser sheet, DBEF and the prism of the original plate, and use a Fresnel lens so that light homogenization, and used CCD camera take a picture, photos entered into the computer program to do analysis, we can see that uniform panel or uneven. LED lights for a one, it is necessary to use and Measurement CCFL panel at the overlapping of different ways, can be found in the overlap, when the Fresnel lens on the light source for the cross when their light straight for the distribution, On the contrary if the Fresnel lens or in light source at the top of the straight, horizontal distribution of light, so to LED lights do uniform, we must use direct cross-plus-Fresnel lens. LED streetlamp in the measurement, no paste Fresnel lens of the illumination distribution and paste Fresnel lens compared the distribution of illumination, found that although the Fresnel lens will reduce its intensity, but could be extended exposure to light the scope of the ground, but not paste Fresnel lens for the illumination of the rectangular tower, a paste of the Fresnel lens is more square. If not consider LED streetlamp illumination peak attenuation, then set up lights in the road when the stack can reduce the number of street lamps. |
