基于双踪示波器的超声波声速测量的研究

Measurement of Ultrasonic Velocity Based on Dual Tracing Oscilloscope

声速是描述声波在媒质中传播快慢的一个物理量,空气中的声速测量是个综合性很强的物理实验,在实际应用中也具有非常重要的意义,因此许多高等院校都把它列为必选的基础实验。本文用共振干涉法和相位比较法对空气中的声速进行了研究,得到声波在空气中的传播速度,并与理论值进行比较,最后对实验数据进行了误差处理,总之,利用双踪示波器测量空气中声速,波形易于观察,误差较小。

Sound velocity is a physical quantity that describes the speed of sound wave propagation in the medium.The measurement of sound velocity in the Atmosphere is a very comprehensive physical experiment, which is also of great significance in practical application.Therefore, many colleges and universities have made it mandatory the basic experiment.The resonant velocity in the air is studied by resonance interferometry and phase comparison method.The propagation velocity of the sound wave in the air was obtained and compared with the theoretical value. Finally, the experimental data are processed with error. In conclusion, The speed of sound in the air, the waveform is easy to observe, the error is small.