一引言在中学物理中,匀加速直线运动、机械能守恒定律等的实验验证,目前普遍使用的都是打点计时器。但无论是电磁式打点计时器,还是火花式打点计时器,出现故障的机率多,且计时误差大(通常为数十毫秒),给使用带来不便。我们采用红外传感器结合单片机技术改进实验设备, I. INTRODUCTION In the middle school physics, experimental verification of uniform acceleration linear motion, mechanical energy conservation laws, etc., is currently widely used as a tick timer. However, no matter whether it is an electromagnetic dial timer or a spark type timer, the probability of failure is high, and the timing error is large (usually tens of milliseconds), which brings inconvenience to use. We use infrared sensors combined with microcontroller technology to improve experimental equipment.