| dc.description.abstract | 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. | en_US |