摘要
在同样的实验环境条件下,选用四台声速测量仪进行实验,对每台仪器均采用共振干涉法和相位法测量声波在空气中的传播速度并作比较研究。在共振干涉法测量中,选用数字示波器直接观察电压数值变化来确定极大值位置;在相位法实验中,选择示波器的电压最小灵敏度档位观察李萨如形貌变化。实验结果显示,相位法比共振干涉法更准确,更优越。
Measure the speed of sound with four different sound velocimeter in the same experiment environmental conditions.Each instrument are used for resonance interferometry and phase measurement of acoustic wave propagation velocity in the air and make a comparative study.In the measurement of the resonance interferometry,select the digital oscilloscope to observe changes in the voltage values to determine the maximum position;in the experimental phase method,choose minimum voltage sensitivity of the oscilloscope to observe the changes of lissajous figures.The results show that the phase method is more accurate and superior than the resonance interferometry.
出处
《价值工程》
2012年第24期64-65,共2页
Value Engineering
关键词
声波
驻波法
相位法
数字示波器
sound waves
standing wave method
the phase method
digital oscilloscope
