Research On The Nonimaging Optical Design Based On Extended Light Source

In this paper, we will research on the nonimaging optical design based onextended light source, using non-imaging optical and photometry theory as thetheoretical basis of knowledge, systematic studying commonly non-imaging opticscomponent which used extended light source: Lens and Reflector, and applied thetraditional design method SMS (Simultaneous Multiple Surfaces) method based onextended light source to the machine vision lighting system that has achieved verygood effect. Proposed two new non-imaging optics design algorithms usingextended light source——Mirror Reflection Method and Maximum Energy Method,the specific contents are as follows：1. Research on machine vision lighting system, applying the traditional designmethod SMS (Simultaneous Multiple Surfaces) method based on extended lightsource to the machine vision lighting system, and the simulation results provedthat the uniformity on the target surface has increased dramatically. From theuniformity0.8870, the result of traditional design method, improved to0.8124.Due to we always need several kinds of light wavelength to abstract theinformation in machine vision lighting system, we need to replace the lightingsystem having different wavelengths of light source. Using six groups opticalsimulation to demonstrate that simultaneous multi-surface method can canguarantee high uniformity by using the same size light source in the sameoptical system. Illumination uniformity can be achieved:0.8772,0.8760,0.8992,0.9012,0.8781,0.89022. Proposed the new Algorithm for the reflector which can achieve uniformillumination on target surface using extended source——Mirror ReflectionMethod, which is very different from the traditional method using point sourceto design, Achieve overall luminous face of extended source surface mapped onthe reflector micro-surface element. At the beginning of the design consideratethe energy from the light source clockwise y axis θ angle into two partsreceiving surface receives1)IS,the energy projection of extended surface in thedirection of angle θ;2)IM,the energy projection of extended surface’s image on the reflector in the direction of angle θ. Solving the reflector surface elementthrough two parts energies and energy distribution. The reflector cup designedby this method is compact structure, and have better optical controllability.Uniform illumination of target surface achieves0.9213.3. Proposed the new Algorithm for the reflector which with small beam angleoutput——Maximum Energy Method, this method used in many kinds ofextended light source, not only for COB led, but also eletrodeless, or other withfree-form surface light source. Specific introduce of the COB and eletrodelesssource modeling, and the resolving of the maximum angle. At the same time, weuse traditional method to design a reflector with the same size and the samesource to simulation, and the result of the reflector designed by maximummethod is much better, take a good use of light’s energy. The luminous engeryon the target surface of the traditional design is only106.32lm, through themaximum energy method, the new design can achieve524.81lm, which isalmost4times larger than before, and the illumination on the target is2.75times of the original reqirement.