摘要
利用计数计时测速仪测量气垫导轨上滑块运动的加速度,其测量精度直接依赖于2个光电门之间距离的测量,而在实验中该距离的测量往往不易达到很高的精度,致使加速度的测量精度不高.对计数计时测速仪的电路和单片机程序稍加修改,使之能测出滑块从一个光电门运动到另一个光电门所需时间,就无需测量2个光电门之间的距离,因而提高了加速度的测量精度,节约单片机的资源并缩短运行时间.
After measuring distance of two photoelectric detectors and two time intervals during which either of two photoelectric detectors are shadowed by an object, acceleration of the object can be computed. Because the two time intervals can be measured by a microcontroller, the accuracy of the acceleration depends mainly on the measurement accuracy of the distance. By measuring one more time interval during which the object moves from one photoelectric detector to the other, and also by careful software programming, measurement of the distance is not needed, thus improving the accuracy of the acceleration.
出处
《物理实验》
2006年第6期39-41,共3页
Physics Experimentation
作者简介
邓正才（1966-），男，湖南宁乡人，国防科学技术大学理学院讲师，硕士，从事实验仪器开发与实验物理教学．
