【摘要】 空气中的声速随着温度的变化而变化。开发了基于单片机的声速随温度变化的测量系统,该系统利用80C196KC的高速输出和输入功能,记录下扬声器发出声波和麦克风接受声波的时间,并利用二极管作为温度传感器测量空气温度。利用PC的串口通信功能和Visual Basic的良好界面实时测绘出声速随温度变化的关系曲线。该曲线与理论曲线非常吻合。该测量系统已经应用于大学物理实验课堂。更多还原

【Abstract】 The sound velocity varies with the air temperature.A MCU-based measuring system of sound velocity change with temperature was developed,which used 80C196KC high-speed output and input function,recorded the time when the speaker sent out sound wave and microphone accepted it,and recorded the temperature by diode.A real-time curve of relationship between sound velocity and temperature was obtained using PC serial communication and Visual Basic.The curve fits the theoretical one very well.The system has been applied to college physics experiment course.更多还原