LED热分析实验系统中光功率测量模块的设计  

作　　者：谷承儒 张建新[1,2] 薛亮 赵政[1] 邹正阳 颜会芬 任钊杰 李锐 

机构地区：[1]天津工业大学天津市电工电能新技术重点实验室,天津300387 [2]天津工业大学天津市光电检测技术与系统重点实验室,天津300387

出　　处：《科技资讯》2018年第12期99-101,105,共4页Science & Technology Information

基　　金：国家大学生创新创业训练计划项目(项目编号:201610058036);天津市教委科研计划项目(自然科学)(项目编号:2017ZD06)

摘　　要：光功率测量是对LED光学和热学性能进行评价与分析的必备环节。为了搭建学生教学使用的LED热分析实验系统,设计了一款LED光功率采集模块。该模块的光学腔能为LED提供散热组件,并可排除光信号被硅PIN光电二极管采集时的光线干扰问题,输出可靠的电流信号,进而被后续的对数放大电路转化为电压信号。该电压信号在STM32F103主控芯片的定时控制下,被A/D转换器处理成数字信号,并实时上传至计算机软件。在采集电压的数据处理中,平滑处理可进一步滤除信号噪声,参照焊点温度的拟合处理可实现采集电压与光功率的对应校准。本模块设计简洁,成本低廉,测量速度快,分辨度良好,非常适合在LED散热相关课程的实验教学中推广使用。Optical power measurement is an essential test for the analysis and evaluation of LED optical and thermal performance.In order to set up an experimental system of LED thermal analysis,an optical power measurement module was designed and implemented.In the measurement module,optical cavity provides heat sink for LED cooling and eliminates light interference in the process of light signal acquisition by Si-PIN photodiode.The output current signal of Si-PIN photodiode can be converted to voltage signal by logarithmic ratio amplif ication circuit.Under the control of STM32F103 devices,the analog voltage signal can be converted to digital voltage signal through A/D converter and transmitted to computer soft via serial port.In data processing of acquired voltage,appropriate data smoothing can remove the noise in signal,the fitting formula based on solder joint temperature by linear regression analysis can be used to calibrate the relationship between acquired voltage and optical power.The optical power measurement module has some advantages such as simple structure,low cost,high measure speed,and higher resolution.Therefore,the measurement module is worth to widely apply in experimental teaching of related courses.

关 键 词：光功率测量 LED 光电二极管 对数放大电路 

分 类 号：TH741[机械工程—光学工程]