摘要
利用声卡和matlab设计了一套变频定距法测量声速的装置,喇叭和麦克风放在共鸣管的一端,保持共鸣管水面高度不变,通过matlab软件控制声卡改变喇叭的发声频率,当反射波和入射波信号发生相遇时,可以从频谱图上看出干涉加强或干涉相消时的频率,从而得到声速。实验结果和理论声速相比较,百分偏差最大为1.66%。
A device was designed for measuring sound velocity by using the sound card and MATLAB, The speaker and microphone were placed at one end of the resonance tube, Water surface height was unchanged The sound frequency was changed by sound card and MATLAB software, When the reflected wave and the dent wave met, resonance happened, If the interference strengthening or weakening, frequencies were saw the frequency spectrum, The speed of sound was measured. The experimental results had been compared the theoreticalvelocity;the maximum percentage deviation was 1.66%. inci- from with
出处
《大学物理实验》
2015年第5期109-112,共4页
Physical Experiment of College
基金
山西省高校科技创新项目(2013157)
关键词
声速
变频定距法
声卡
麦克风
MATLAB
the sound velocity
changing frequency in a fixed distance
sound card
microphone
MATLAB
