基于光敏电阻和单片机的“马吕斯定律”自动测量系统  

Improving Design and Experiment of Malus Law with Photoresistor and Microcontroller

作　　者：郝蕴琦 邓文豪 缪斌昌 杨坤 Hao Yunqi;Deng Wenhao;Miao Binchang;Yang Kun(School of physics and electronic engineering,Zhengzhou University of light industry,Zhengzhou Henan,450002)

机构地区：[1]郑州轻工业大学物理与电子工程学院,河南郑州450002

出　　处：《电子测试》2021年第9期12-14,共3页Electronic Test

基　　金：国家自然科学基金(No.61705199);河南省科技攻关计划(No.212102210031);郑州轻工业大学2020年度校级虚拟仿真实验教学项目资助。

摘　　要：利用光敏电阻和STC89C516RD51单片机,改进了基于硅光电池和检流计的“马吕斯定律验证”实验系统,实现完全自动化测量。光敏电阻将光强转换为电流,单片机获知和光强对应的电压最小值进行系统标定;单片机控制步进电机和同步带驱动检偏器转动,设定步进间隔,自动测量并记录电压值,获得了偏振正弦曲线。实验结果和理论分析及传统手动实验验证结果一致。The traditional experimental setup of Malus’s Law,including silicon photocell and galvanometer,is improved with photoresistor and STC89C516RD51 microcontroller,realizing the fully-auto measurement.The photoresister change the optical intensity from the depolarizator into optical current;the microcontroller get the smallest voltage and correspondingly calibrate the whole system;then the microcontroller drive the stepping motor and the synchronous belt,in order to move the depolarizator;according to the set stepping interval,the corresponding voltage is displayed on the liquid screen.The experimental results show that the sinusoidal curve is accordant with the theory and traditional experimental measurement.

关 键 词：马吕斯定律 光敏电阻 STC89C516RD51单片机 步进电机 

分 类 号：O436.3[机械工程—光学工程] TP274[理学—光学] TP368.1[理学—物理]