Freefrom Optical Design For Monitoring Lenses

High-quality lighting has always been one of the pursuits of people's quality life.Non-imaging optical design has become a hot topic to meet the increasing lighting requirement day by day.At present,solid-state light source LEDs occupy the lighting market with their advantages of durability,environmental protection and energy saving.And the application of LED lighting have been extended to the monitoring field.As an emerging industry,the surveillance carries different security requirements such as city safety,smart transportation,safety of hotels and ports.Compared with the traditional solution with lack of precision,the LED free-form surface design method can be better solved,and can achieve the predetermined monitoring effect.Based on the current monitoring lens,the presented dissertation designs a new monitoring lens to realize the rectangular spot with a free-form surface optical design method.The contents are list as follows in detail.Firstly,some conventional free-form surface design methods are investigated and summarized.Secondly,the advantages and disadvantages of the methods are given out.And a new free-form surface lens designed with the SQM method is carried out.The SQM method has a natural mapping relationship.A smooth optical surface can be generated by the iteration method with SQM.By using the orthogonal polynomial surface interpolation,a continuous smooth free-form surface lens that meets the light distribution requirements can be obtained.This optimized design algorithm has potential to be applied in wider lighting field,and is a fast solution with good practical value.The uniformity of the target spot is up to 0.89 in the optical simulation,and the validation of our design is verified by the experimental results.