摘要
利用3DU5C光敏三极管作为传感器,在干涉条纹移动时,光强度的周期性变化在光敏三极管的集电极(或发射极)电流随之跟着周期性变化;这种周期性的电量变化次数可以通过单片机程序和驱动电路在4位数码管上显示出干涉条纹的移动条数.这避免了学生长时间观察激光数干涉条纹对眼睛造成的不良影响.
Using 3DU5 C photosensitive triode as sensors,the variation of the light intensity caused by the movement of the interference fringes was detected by following the periodical changes of the photosensitive transistor＇s collector（or emitter）current.The cycles of the current were counted by a single-chip computer and showed on a four-digit tube article,reflecting the movement of the interference fringes.The eyestrain caused by the long-time staring at the laser interference pattern was avoided.
出处
《物理实验》
2017年第2期20-23,共4页
Physics Experimentation
基金
四川大学教改基金(No.SCUY7045)
