利用光电效应实验仪测量液体浓度  

Measurement of Liquid Concentration by Photoelectric Effect Experimental Instrument

作　　者：冯宇 王俊杰 梁申 吕宪魁[1] 郑永刚[1] 刘文广[1] 冯洁[1] FENG Yu;WANG Junjie;LIANG Shen;Lü Xiankui;ZHENG Yonggang;LIU Wenguang;FENG Jie(College of Physics&Electronic Information,Yunnan Normal University,Kunming 650500,China)

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650500

出　　处：《大学物理实验》2023年第1期20-22,共3页Physical Experiment of College

基　　金：云南省省级线下一流课程“基础物理学实验(二)”,西南地区物理学术竞赛类教育教学改革研究项目(SWPTJG2105);教育部产学合作协同育人项目(202002281001);高等学校教学研究项目(DWJZW202142xn);教育部新工科项目(E-SXWLH XLX20202605);高等学校教学研究项目(DWJZW202235xn)。

摘　　要：一定波长的光透过液体时会有部分光强被液体吸收,不同浓度的液体对光强的吸收能力不一样。经液体吸收后剩余的光强依然会使光电管产生光电流。基于光电效应的实验原理,测量同一液体不同浓度时对应的光电流大小,绘制二者的定标曲线并通过计算机拟合二者的线性方程。即最终仅需通过光电效应实验仪测得液体挡光后光电流的大小即可计算液体对应的浓度。When a certain wavelength of light passes through the liquid,some of the light intensity will be absorbed by the liquid,and the absorption ability of different concentrations of liquid to the light intensity will be different.The remaining light intensity after liquid absorption will still cause photocurrent to be generated in the phototube.Based on the experimental principle of photoelectric effect,the corresponding photocurrent of the same liquid at different concentrations was measured.The calibration curve of the two is drawn,and the linear equation of the two is fitted by computer.That is,the corresponding concentration of the liquid can be calculated only by measuring the photocurrent of the liquid after light blocking through the photoelectric effect tester.

关 键 词：光电效应 液体浓度 光电流 光电效应实验仪 

分 类 号：O59[理学—应用物理]