摘要
本文采用通用设备构建物理实验教学系统,可提升设备使用自由度,突出实验测量背后的物理原理,帮助学生以科研思维做教学实验,提高人才培养质量.本文设计了一种基于LabVIEW软件平台使用fA级高精度静电计跨阻放大器检测光电流、以NI myDAQ采集数据的光电效应实验系统.利用本系统,可完整、定量、实时记录并直观显示光电流I_(KA)随阳极电压U_(KA)的变化规律,同页面显示多条不同参数的I_(KA)-U_(KA)特性曲线,测定不同谱线(频率v)的截止电压U_(0).由数据分析模块直接得到U_(0)-v拟合曲线与其关系式以及普朗克常量h.用该系统测量得h=(6.63±0.28)×10^(-34) J·s,与公认值h 0=6.62606896×10^(-34) J·s对比,相对误差为0.40%.结果表明,本系统测量结果和普朗克常量公认值吻合.
A physics experiment teaching system constructed by using general purpose instruments can improve the freedom of equipment usage,highlight physical principles behind the experimental measurements,assist students in better experiment experiences with scientific research thinking,and improve the quality of innovation training.A photoelectric effect experiment system based on LabVIEW platform is designed,which uses fA-grade high-precision electrometer transimpedance amplifier to detect photocurrent and uses NI myDAQ to collect data.With this system,quantitative real-time record can be completed.Visual display the variation of photocurrent I_(KA) with anode voltage U_(KA),multiple I_(KA)-U_(KA) characteristic curves with different parameters are displayed in the same coordinate.The cut-off voltage U_(0) of different spectra lines(frequencyν)is measured.The U_(0)-ν fitting curve and Planck constant h are obtained by data analysis module.The system is used to measure a set of spectral lines,get h=(6.63±0.28)×10^(-34) Js.It is consistent with the recognized value h 0=6.62606896×10^(-34) Js,and the relative error is about 0.40%.The results show that the measured results of the system agree well with the recognized value of Planck constant.
作者
廖德驹
冯饶慧
崔新图
沈韩
黄臻成
方奕忠
庞晓宁
LIAO De-ju;FENG Rao-hui;CUI Xin-tu;SHEN Han;HUANG Zhen-cheng;FANG Yi-zhong;PANG Xiao-ning(School of Physics,National Demonstration Centre for Experimental Physics Education,Sun Yat-sen University,Guangzhou 510275,China)
出处
《大学物理》
2024年第5期29-32,共4页
College Physics
基金
中山大学本科教学质量与教学改革项目(教务[2023]96号)资助。
