一种色温及亮度可调的均匀光源研究  

Research on a Uniform Light Source with Adjustable Color Temperature and Brightness

作　　者：刘佳辉 袁士东[2] 薛子安 丁昆[2] LIU Jiahui;YUAN Shidong;XUE Zian;DING Kun(Changzhou Institute of Optoelectronic Technology,Changzhou 213000,China;Chinese Academy of Sciences Shanghai Institute of Technology Physics,Shanghai 200083,China)

机构地区：[1]常州光电技术研究所,江苏常州213000 [2]中国科学院上海技术物理研究所,上海200083

出　　处：《照明工程学报》2024年第2期32-38,共7页China Illuminating Engineering Journal

基　　金：国家重点研发计划重点专项(2021YFC2103300);中国科学院空间应用工程与技术中心项目(YYWT-0901-EXP-16)。

摘　　要：均匀光源对成像系统定标和校正而言至关重要,除光源的均匀性外,对亮度、色温等参数的精准调节也有重要意义。本文介绍了一种基于冷白与暖白LED混光的计算方法与装置。充分利用LED光源的可控性和冷暖白光LED的混光技术,通过调节冷暖白光LED的电流,采集光源输出的亮度与色温数据,建立电流与亮度、色温的对应关系。利用MATLAB的样条插值函数网格细化整个数据模型,最后以亮度、色温为目标值,反向求出相对应的冷暖白光LED的电流值。实验表明,在亮度±200 cd/m^(2)、色温±50 K的误差值设定下,混色光源亮度的起伏小于2%,相关色温偏差在±30 K以内,光源面亮度均匀度大于96%。Uniform light sources are crucial for calibration and correction in imaging systems.In addition to uniformity,precise adjustment of parameters such as brightness and color temperature is also of significant importance.This paper introduces a computational method and device based on mixing cold white and warm white LEDs.By fully utilizing the controllability of LED light sources and the mixed-light technology of cold and warm white LEDs,this method adjusts the currents of cold and warm white LEDs and collects data on the brightness and color temperature of the light source output.This establishes a correspondence between the currents and the brightness/color temperature.Using MATLAB’s spline interpolation function,the entire data model is refined by grid refinement.Finally,with brightness and color temperature as target values,the corresponding currents of cold and warm white LEDs are reverse-calculated.The experiments show that,with error margins set at±200 cd/m^(2)for brightness and±50 K for color temperature,the fluctuation in brightness of the mixed light source is less than 2%,and the deviation in correlated color temperature is within±30 K.The uniformity of the luminance on the light source surface is greater than 96%.

关 键 词：色温可调 亮度可调 样条插值 亮度均匀度 

分 类 号：TN206[电子电信—物理电子学]