基于DISLab电容充电法速度的测量

Measurement of Instantaneous Speed Based on Capacitor Charging and DISLab

将物体通过一小段距离的时间,转换成用此过程对电容两端的充电电压来描述,而电容的充电电压可用DISLab电压传感器采集,再经反相推导,把电压量转换成时间量。根据v=s/t,即可测量物体的速度。实验表明,这种电容充电法测得的速度与传统光电门法所测的速度相一致。

We can define the time during which the object moves through the setted distance as the voltage quantity increase through capacitance charging in the mentioned process, and using DISLab voltage sensor to collect the voltage quantity. Through inverse process, turn voltage quantity into time;according to the equation ＂v=s/t＂ （velocity is equal to the distance divided by time） ,we get the speed correctly. Experiments show that： the speed we got by collecting the increased voltage quantity during the process of capacitance charging is exactly the same as that got via conventional photogate.