基于自制暗箱测量光电效应中光强与光电流的关系

Measurement of the relationship between light intensity and photocurrentin photoelectric effect based on self-made “black box” experimental device

本文基于自制的“暗箱”实验装置,通过3种方法来验证光电流与光强的关系:一是通过控制光电管两端的电压研究不同光强下光电管两端的伏安特性曲线;二是通过在相同光强下改变光电管与光源的距离研究光电管的光电特性曲线;三是通过光强传感器直接测定光电流与光强的关系.以上3种方法的实验数据均通过PASCO平台进行实时采集和分析,获得了未达到饱和时光电流随光强增加而增大的实验结果.

Based on the self-made“black box”experimental device,this paper verified the relationship between saturated photocurrent and light intensity by three methods:The first method is to study the volt-ampere characteristic curve under different light intensity by controlling the voltage of the phototube;The second one is to study the photoelectric characteristic curve of photocell by changing the distance between phototube and light source under the same light intensity;And the third one is that the relationship between photocurrent and light intensity can be directly measured by using light intensity sensor.The experimental data were collected and analyzed by PASCO platform in real time.When the saturation was not reached,the experimental results show that the photocurrent increased with the increase of light intensity.