基于COB LED的均匀光强分布可见光通信系统发射端的光学设计
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摘要
针对光线在大角度偏转时菲涅耳损耗大、光强均匀性差等问题,提出了基于最优双偏转能量映射和贝塞尔曲线多参数优化的双自由曲面透镜设计算法,并利用该算法设计了基于板上芯片型(COB)发光二极管(LED)的双自由曲面透镜,该透镜可应用于可见光通信系统的光学发射端。以大面积发光面的COB LED作为光源,通过控制自由曲面透镜内外两个表面上的入射光线偏转角的比例关系(即偏转系数),可降低菲涅耳损耗。构建了出光角分别为180°和260°的大角度均匀光强分布的双自由曲面透镜,其光强均匀度分别为0.92和0.90,其光能利用率分别为89.4%和85.9%。将单自由曲面透镜和双自由曲面透镜的光学性能作对比,结果表明,单自由曲面透镜可实现出光角范围为120°~180°、光强均匀度超过0.85以及光能利用率超过85%的光分布,双自由曲面透镜在达到同样的光强均匀度和光能利用率时,可实现出光角范围为100°~260°之间的均匀光强分布。因此,利用双自由曲面透镜能够实现更大范围出光角的均匀光强分布,从而满足可见光通信系统的光学发射端的光分布要求。
The large angle deflection of light causes such problems as the high Fresnel loss and the poor luminous intensity uniformity.To solve these problems,a design algorithm of double freeform surface lens,which is based on the optimal double deflection energy mapping and the multi-parameter optimized Bézier curve,is proposed.Guided by this algorithm,a double freeform surface lens based on the light emitting diode(LED)of chip on broad(COB)is proposed,and it can be used for the optical transmitting end of visible light communication systems.To reduce the Fresnel loss,we use the large-emission area COB LED as light source,and control the ratio of incident light deflection angles of freeform surface lens' s inner and outer surfaces.Double freeform surface lenses,with large angle uniform luminous intensity distribution and with irritation angles of 180° and 260°respectively,areconstructed.The luminous intensity uniformity of the lenses reaches up to 0.92 and 0.90 respectively,and the light utilization efficiency of the lenses reaches up to 89.4% and 85.9%respectively.The optical properties of the single freeform surface lens and the double freeform surface lens are compared.For the single freeform surface lens,light distribution with high luminous intensity uniformity over 0.85 and high light utilization efficiency over 0.85 can be achieved when the irritation angle varies in the range from 120°to 180°.For the double freeform lens with the same luminous intensity uniformity and light utilization efficiency,the irritation angle varies in a broader range from 100°to 260°.This study indicates that the double freeform surface lens can realize uniform light intensity distribution with broad irritation angle,and it can satisfy the light distribution requirements of optical transmitting end in visible light communication systems.
The large angle deflection of light causes such problems as the high Fresnel loss and the poor luminous intensity uniformity.To solve these problems,a design algorithm of double freeform surface lens,which is based on the optimal double deflection energy mapping and the multi-parameter optimized Bézier curve,is proposed.Guided by this algorithm,a double freeform surface lens based on the light emitting diode(LED)of chip on broad(COB)is proposed,and it can be used for the optical transmitting end of visible light communication systems.To reduce the Fresnel loss,we use the large-emission area COB LED as light source,and control the ratio of incident light deflection angles of freeform surface lens' s inner and outer surfaces.Double freeform surface lenses,with large angle uniform luminous intensity distribution and with irritation angles of 180° and 260°respectively,areconstructed.The luminous intensity uniformity of the lenses reaches up to 0.92 and 0.90 respectively,and the light utilization efficiency of the lenses reaches up to 89.4% and 85.9%respectively.The optical properties of the single freeform surface lens and the double freeform surface lens are compared.For the single freeform surface lens,light distribution with high luminous intensity uniformity over 0.85 and high light utilization efficiency over 0.85 can be achieved when the irritation angle varies in the range from 120°to 180°.For the double freeform lens with the same luminous intensity uniformity and light utilization efficiency,the irritation angle varies in a broader range from 100°to 260°.This study indicates that the double freeform surface lens can realize uniform light intensity distribution with broad irritation angle,and it can satisfy the light distribution requirements of optical transmitting end in visible light communication systems.
引文
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23 Yu Daoyin,Tan Hengying.Engineering optics[M].3rd ed.Beijing:China Machine Press,2011:300-313.郁道银,谈恒英.工程光学[M].3版.北京:机械工业出版社,2011:300-313.
24 Chaves J.Introduction to nonimaging optics[M].Boca Raton:CRC Press,2008:403-413.
25 Shi Fazhong.Computer aided geometric design and non-uniform rational B-spline[M].Beijing:Higher Education Press,2013:114-116.施法中.计算机辅助几何设计与非均匀有理B样条[M].北京:高等教育出版社,2013:114-116.
2 Tanaka Y,Haruyama S,Nakagawa M.Wireless optical transmissions with white colored LED for wireless home links[C].The 11th IEEE International Symposium on Personal,Indoor and Mobile Radio Communications,2000,2:1325-1329.
3 Komine T,Nakagawa M.Fundamental analysis for visible-light communication system using LED lights[J].IEEETransactions on Consumer Electronics,2004,50(1):100-107.
4 Hao H G,Zhang D D,Tang S.Analysis of the LED lamp arrangement for uniformity of illumination in indoor VLCsystem[J].Journal of the Optical Society of Korea,2014,18(6):663-671.
5 Wang Z X,Yu C Y,Zhong W D,et al.Performance of a novel LED lamp arrangement to reduce SNR fluctuation for multi-user visible light communication systems[J].Optics Express,2012,20(4):4564-4573.
6 Farr N,Bowen A,Ware J,et al.An integrated,underwater optical/acoustic communications system[C].OCEANS2010,2010:11595850.
7 Doniec M,Vasilescu I,Chitre M,et al.AquaOptical:a lightweight device for high-rate long-range underwater point-topoint communication[C].OCEANS 2009,2009:11155029.
8 Wang Y Q,Wang Y G,Chi N,et al.Demonstration of 575-Mb/s downlink and 225-Mb/s uplink bi-directional SCM-WDM visible light communication using RGB LED and phosphor-based LED[J].Optics Express,2013,21(1):1203-1208.
9 Li J F,Huang Z T,Zhang R Q,et al.Superposed pulse amplitude modulation for visible light communication[J].Optics Express,2013,21(25):31006-31011.
10 Yang Wenning,Song Lu,Yu Lintao.Research of emergency communication system by LED Flashlight and visible light[J].Optical Communication Technology,2014,9:28-30.杨文宁,宋路,于林韬.LED强光手电可见光应急通信系统研究[J].光通信技术,2014,9:28-30.
11 Liu Haojie,Lan Tian,Ni Guoqiang.Research on the light emitting diode array launching performance for indoor visible light communication[J].Acta Physica Sinica,2014,63(23):238503.刘浩杰,蓝天,倪国强.室内可见光通信发光二极管阵列发射性能的研究[J].物理学报,2014,63(23):238503.
12 Shen Y X,Ji Z C,Su Z P.Optimizing spherical light-emitting diode array for highly uniform illumination distribution by employing genetic algorithm[J].Journal of Photonics for Energy,2013,3(1):034594.
13 Chen C,Zhang X H,Rao J H.Optical design for an LED-based handheld underwater wireless optical communication system[J].Chinese Optics Letters,2015,13(2):020801.
14 Ries H,Muschaweck J.Tailored freeform optical surfaces[J].J Opt Soc Am A,2002,19(3):590-595.
15 Ding Y,Liu X,Zheng Z R,et al.Freeform LED lens for uniform illumination[J].Optics Express,2008,16(17):12958-12966.
16 Luo Y,Feng Z X,Han Y J,et al.Design of compact and smooth free-form optical system with uniform illuminance for LED source[J].Optics Express,2010,18(9):9055-9063.
17 Fournier F R,Cassarly W J,Rolland J P.Fast freeform reflector generation using source-target maps[J].Optics Express,2010,18(5):5295-5304.
18 Mao X L,Li H T,Han Y J,et al.Polar-grids based source-target mapping construction method for designing freeform illumination system for a lighting target with arbitrary shape[J].Optics Express,2015,23(4):4313-4328.
19 Qian Keyuan.Near field optical modeling of LED and design optimization for direct-type backlight optical system[J].Acta Optica Sinica,2015,35(5):0522001.钱可元.LED近场光学模型与直下式背光源透镜的设计优化[J].光学学报,2015,35(5):0522001.
20 Wu R M,Zheng Z R,Li H F,et al.Optimization design of irradiance array for LED uniform rectangular illumination[J].Applied Optics,2012,51(13):2257-2263.
21 Xu Chao,Gao Shumei,Qian Weiying,et al.A optimization design of compact uniform lens for large-size LED[J].Laser&Optoelectronics Progress,2015,52(4):042201.徐超,高淑梅,钱维莹,等.大面型LED紧凑型匀透镜优化设计[J].激光与光电子学进展,2015,52(4):042201.
22 Yan Wenping,Guo Zhenning,Lin Jieben,et al.Design of double freeform-surface lens with large view angle for uniform illumination of the near-field[J].Acta Photonica Sinica,2015,44(1):0122002.颜稳萍,郭震宁,林介本,等.实现近场均匀照明的双自由曲面大角度透镜设计[J].光子学报,2015,44(1):0122002.
23 Yu Daoyin,Tan Hengying.Engineering optics[M].3rd ed.Beijing:China Machine Press,2011:300-313.郁道银,谈恒英.工程光学[M].3版.北京:机械工业出版社,2011:300-313.
24 Chaves J.Introduction to nonimaging optics[M].Boca Raton:CRC Press,2008:403-413.
25 Shi Fazhong.Computer aided geometric design and non-uniform rational B-spline[M].Beijing:Higher Education Press,2013:114-116.施法中.计算机辅助几何设计与非均匀有理B样条[M].北京:高等教育出版社,2013:114-116.