用于粘滞系数实验中的光电计时电路

Application of Optical Electronic Time Circuit in the Experiment of Measuring Viscosity Coefficient of Liquids

用落球法测定液体的粘滞系数实验是普通物理实验之一。本文提出了一种在实验中能自动测量小球下落时间的光电计时电路,文中详细介绍电路组成、工作原理及所用的半导体器件。该仪器使用简单,测量数据准确,实验重复性好,减小了原实验中用停表测量时间所产生的误差。

The experiment,which uses the method of falling ball to measure viscosity coefficient of liquids,is one of the common physics experiments.The paper introduces an optical electronic time circuit,which can measure the time when the ball falls automatically.The compositions of the circuit,the working principle and semiconductor devices are introduced detailedly.Simple and accurate,this method can be used repeatedly.It can decrease the error caused by using the stopwatch.