CAJ | 학술논문

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%.
이용성잡화matlab설계료일투변빈정거법측량성속적장치,나팔화맥극풍방재공명관적일단,보지공명관수면고도불변,통과matlab연건공제성잡개변나팔적발성빈솔,당반사파화입사파신호발생상우시,가이종빈보도상간출간섭가강혹간섭상소시적빈솔,종이득도성속. 실험결과화이론성속상비교,백분편차최대위1. 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 inci-dent wave met,resonance happened,If the interference strengthening or weakening,frequencies were saw from the frequency spectrum,The speed of sound was measured. The experimental results had been compared with the theoretical velocity;the maximum percentage deviation was 1 . 66%.