作　　者： ; ; ; ; ;

机构地区： 华南师范大学物理与电信工程学院

出　　处： 《计算机工程与应用》 2005年第34期207-209,共3页

摘　　要： 在普通PC上研制一套基于虚拟仪器技术的声速直接测量系统。以计算机声卡结合虚拟仪器软件LabVIEW开发针对声速测量的虚拟脉冲信号发生器和数字存储示波器。根据数字存储示波器显示的采样点数计算出声波通过两个声音传感器所用时间,进行声速直接测量。在距离为1m左右时实验相对误差为0.3%。实验中只需发出短暂的脉冲声频,解决了音频范围内声速测量的声音扰人问题。系统具有灵活性高,成本低廉的特点,适合在物理实验中推广应用。 A direct measurement system of sound speed based on Virtual Instrument was proposed.A virtual pulsesignal-generator and a digital-storage-oscilloscope are designed based on PC sound card and LabVIEW.The transmission time of sound wave between two MIC is deduced from the waveform displayed on the screen of Oscilloscope,so that sound speed is directly measured.The experiment results show that the system has an accuracy of 0.3 percent when the distance between the two microphones is about lm.ln this exiperiment,only one pulse audio is generated and sent out, so the disturbing of the sound is avoided.This system is low cost,flexible and fitted for using in the physical experiment.

关 键 词： 虚拟仪器 声速测量 声卡 数字存储示波器

领　　域： [理学] [理学] [自动化与计算机技术] [自动化与计算机技术]