摘要
针对传统偏振光与波片实验需人工调节偏振片和波片转角并记录数据,过程繁琐、数据量大、耗时过长的问题,开发出计算机测控的教学实验系统。以半导体固体激光器为光源,PC机通过USB接口和控制器驱动步进电机,带动中心有透光孔的精密电控旋转台按设定步距角转动。激光束与转台中心同轴,偏振片或波片同心安装在旋转台上同步旋转,透射光经过检偏器,由数字式光功率计检测通过各元件后光强的变化;信号经另一USB接口传输至PC机。计算机控制偏振片或波片旋转,同时自动采集对应转角的透射光强值并存储。实验结束后检测结果可通过数据文件导出,由学生在课后自行处理。新教学实验系统可完成1/4和1/2波片实验,验证马吕斯定律,能大幅度节省实验时间并提高精度。
Aiming at the problems existing in the traditional polarized and wave-plates experiments such as polarizers and wave-plates have to be adjusted by hand,large amount of data need to be recorded and processed,the procedure is complicated and time-consuming,a computer measurement and control tutoring experimental system was developed.Using a solid semiconductor laser as light source,a hollow precise electronic control rotating platform was actuated by a stepping motor driven by a controller which communicated with personal computer via USB interface.The laser beam and the rotating platform were aligned on a common axis,a polarizer or wave-plate was mounted and rotated coaxial with the rotating platform,the intensity of the transmission light through all optical components was detected by a digital optical power meter through a polarizer.The received signal was transmitted into personal computer via another USB interface.The computer controlled the rotation of the polarizer or wave-plate,collected and stored the intensity data of the transmission light corresponding to the rotation angle automatically.The testing result can be exported to a report data fileat the end of the experiment and processed by college students themselves after class.The novel teaching experiment system is suitable for polarized interference experiment of 1/4 and 1/2 wave-plates and verifying Malus law.It will save much time and improve the accuracy of the experiments.
出处
《实验室研究与探索》
CAS
北大核心
2014年第10期125-128,共4页
Research and Exploration In Laboratory
关键词
偏振光
波片实验
激光束
光功率计
polarization
wave-plate experiment
laser beam
light power meter
