Abstract：Light emitting diode (LED), which acts as a signal light source in fields such as airports and railways,usually uses the way of arrays of LEDs. The traditional method is to send the light source to the laboratory for detection after disassembly. In this way, the state of the light source at the work site cannot be obtained and the whole detection period is a little long. A method based on illumination error is proposed to solve the above problems. First, in the scene where the lamp is not disassembled or moved, the illumination distribution was detected by moving the illumination probe in the near-field area. Second, presetting the light intensity distribution of each LED. Third, calculating the error between the illuminationwhich was formed at the measuring point under this light intensity distribution and actual illumination that was measured by the illumination probe at the measuring point and updating the setting intensity value and iterating several times until the error is small enough. Final, the approximate light intensity distribution of each LED calculated at this time is superimposed to calculate the light intensity distribution of the entire LED array. The method can quickly and accurately detect the distribution of light intensity of lamps on the spot, while ensuring the portable design of the whole detection system.The experimental results show that the proposed method can detect the light intensity under different conditions, and the matching degree can reach more than 93%.
［1］Moreno I, Sun C C. Modeling the radiation pattern of LEDs［J］. Optics Express, 2008, 16(3): 1808-1819.
［2］桂立, 尹韶云, 蔡文涛, 等. 基于光源近场模型的LED光学扩展量测量方法［J］. 光子学报, 2017, 46(1): 182-187.
Gui L, Yin S Y, Cai W T, et al. Measurement Method of LED Etendue Based on Near-field Source Model［J］. Acta Photonica Sinica, 2017, 46(1): 182-187.
［3］赵伟强, 刘慧, 刘建, 等. 采样间隔对分布光度计测量LED总光通量的影响［J］. 计量学报, 2015, 36(1): 22-25.
Zhao W Q, Liu H, Liu J, et al. Effect of Sampling Interval on the Measurement of the Total Luminous Flux of LED［J］. Acta Metrologica Sinica, 2015, 36(1): 22-25.
［4］刘建, 刘慧, 赵伟强, 等. 测量距离对发光二极管平均发光强度的影响［J］. 光学学报, 2015, 35(9): 151-155.
Liu J, Liu H, Zhao W Q, et al. Impact of Distance between Detector and LED on Measurement of Averaged LED Intensity［J］. Acta Optica Sinica, 2015, 35(9): 151-155.
［5］李存龙, 陈伟民, 刘显明, 等. 基于误差理论的LED灯具光强分布测量精确度分析［J］. 光电子·激光, 2011, 22(10): 1537-1541.
Li C L, Chen W M, Liu X M, et al. Analysis of measurement accuracy for light intensity distribution of LED luminaries based on error theory［J］. Journal of Optoelectronics·Laser, 2011, 22(10): 1537-1541.
［6］Liu X M, Cai W T, Lei X H, et al. Far-field distance for surface light source with different luminous area［J］. Applied optics, 2013, 52(8): 1629-1635.
［7］朱超平, 秦华锋, 刘启能. 手指静脉识别系统矩形阵列光源特性分析及优化设计［J］. 计量学报, 2020, 41(1): 16-21.
Zhu C P, Qin H F, Liu Q N. Characteristic Analysis and Optimization Design of Rectangular Array Light Source for Finger Vein Recognition System［J］. Acta Metrologica Sinica, 2020, 41(1): 16-21.
［8］赖伟, 陈伟民, 雷小华, 等. 平面LED阵列远场条件研究与实验验证［J］. 光学技术, 2011, 37(3): 269-274.
Lai W, Chen W M, Lei X H, et al. Research on the far-field condition of flat LED array and experimental verification［J］. Optical Technique, 2011, 37(3): 269-274.
［9］范红忠, 曹民, 李抒智, 等. 光源近场测量在LED光学设计中的应用与研究［J］. 光学学报, 2012, 32(12): 229-233.
Fan H Z, Cao M, Li S Z, et al. Application and Investigation of Near-Field Goniophotometer Measurements in LED Optical Design［J］. Acta Optica Sinica, 2012, 32(12): 229-233.
［10］姚其, 赵海天. LED成像分布光度计的研究［J］. 照明工程学报, 2013, 24(2): 58-61.
Yao Q, Zhao H T. Research on Image-based LED Distribution Photometer［J］. China Illuminating Engineering Journal, 2013, 24(2): 58-61.
［11］Schmhling F, Wübbeler G, Lopez M, et al. Virtual experiment for near-field goniophotometric measurements［J］. Applied optics, 2014, 53(7): 1481-1487.
［12］姜琳, 刘慧, 闫劲云, 等. LED灯丝筛选方法研究［J］. 计量学报, 2019, 40(4): 569-575.
Jiang L, Liu H, Yan J Y, et al. Research on Screening Methods of LED Filament［J］. Acta Metrologica Sinica, 2019, 40(4): 569-575.
［13］唐翠荣, 刘军, 王珊珊, 等. 基于成像式照度探测的光源光强分布测量［J］. 计测技术, 2014, 34(1): 35-38+48.
Tang C R, Liu J, Wang S S, et al. Measurement of Luminous Intensity Based on Imaging Illumination Detect［J］. Metrology & Measurement Technology, 2014, 34(1): 35-38+48.
［14］谢祖通, 翁晓伟, 陈爱华. 基于成像型亮度计的车灯配光性能检测系统研究［J］. 照明工程学报, 2017, 28(2): 61-64.
Xie Z T, Weng X W, Chen A H. Study on Light Distributioin Test Based on Imaging Luminance Meter［J］. China Illuminating Engineering Journal, 2017, 28(2): 61-64.
［15］孙浩杰, 李梦远, 庄杰, 等. LED器件光强分布测试方法进展［J］. 光学仪器, 2014, 36(6): 555-560.
Sun H J, Li M Y, Zhuang J, et al. Research on LED light intensity distribution test methods［J］. Optical Instruments, 2014, 36(6): 555-560.
［16］李新颖, 刘凯, 黄海燕. 多线函数法在曲线拟合中的应用研究［J］. 计量学报, 2018, 39(5): 716-719.
Li X Y, Liu K, Huang H Y. Application of Multi-line Function Method in Curve Fitting［J］. Acta Metrologica Sinica, 2018, 39(5): 716-719.
［17］Bergen A. A practical method of comparing luminous intensity distributions［J］. Lighting Research and Technology, 2012, 44(1): 17-36.
2021, Vol. 42 
