LabVIEW在光速测定实验中的应用  

Application on LabVIEW in Experiment of Measuring the Light Velocity

作　　者：冉俊霞[1] 葛大勇[1] 张少朋 Ran Junxia;Ge dayong;Zhang shaopeng(College of Physics Science and Technology,Hebei University,Baoding,Hebei 071002;Department of physical education,Hebei University,Baoding,Hebei 071002)

机构地区：[1]河北大学物理科学与技术学院,河北保定071002 [2]河北大学体育教学部,河北保定071002

出　　处：《物理通报》2020年第6期86-88,共3页Physics Bulletin

基　　金：河北省高等教育教学改革研究与实践项目,项目编号:2018GJJG015;河北大学实验室开放项目基金资助,项目编号:sy201852;河北大学第二批“精品实验项目”建设项目,项目编号:2017-BZ-JPSY02;河北大2017年度示范性虚拟仿真实验教学项目“真空镀膜虚拟仿真实验”.

摘　　要：光速是非常重要的物理常量,在实验室内受距离限制,常用光拍频法进行光速测量.但是读取数据时主要凭借人眼观察李萨茹图形、或者波形是否移动了一个完整周期,在实际测量时造成了很大的误差,致使最终结果误差增大.利用LabVIEW中的波形处理函数,直接将近程光、远程光的波形进行计算处理,获得其位相差,进而计算光速.该方法不必考虑波形是否移动了一个完整周期,并极大减小了误差,提高了学生综合运用计算机处理数据的能力.The speed of light is a most important physical constant.In the laboratory,the speed of light is usually measured by optical beat frequency method.However,when reading the data,it mainly relies on human eyes to observe whether the graph of Lisaru is completely consistent,or whether the waveform has moved for a complete period.It causes a large error in the actual measurement and increases the error of the final result.In this paper,the waveform processing function in LabVIEW is utilized to calculate and process the waveforms of near-distance light and remote light to obtain the phase difference and then calculate the speed of light.The method does not need to consider whether the waveform has moved for a complete period,which reduces the error and improves the students′ability to process data comprehensively by using computers.

关 键 词：数据处理 LABVIEW 光速 波形 

分 类 号：G642[文化科学—高等教育学] O432.2-4[文化科学—教育学]