论文编号ZXX223 论文字数:12216,页数:31
摘要
虚拟仪器技术强大、灵活，是今后测试技术发展的趋势。
本文比较了计算机声卡和数据采集卡（DAQ）之间的优缺点，发现PC机配置的声卡即可构成实时、高信噪比的声场数据采集系统。基于虚拟仪器技术，利用声卡用于数据采集，设计了虚拟双踪数字示波器。
基于计算机声卡的虚拟仪器成本低、通用性强，在对采样频率要求不高的情况下，可以用声卡取代数据采集卡进行采样和输出。利用虚拟仪器开发工具软件LabVIEW及其数字声音记录节点，研制出基于声卡的虚拟双踪数字存储示波器，其功能和界面都与真实示波器相同。
用普通的16位声卡设计了一种简单的双通道虚拟示波器、它能正确地采集信号，通过LabVIEW自身提供的声音函数调用声卡显示输入信号的波形。利用声卡的左右双声道在PC上配置多块声卡并行工作能够采集多个通道的信号，因而用声卡构建低成本的数据采集系统是切实可行的。
关键词：虚拟仪器；声卡；示波器；数据采集系统；LabVIEW
ABSTRACT
Virtual Instrument technology which is powerful, flexible and convenient is the developing trend of measurement technology. Compared the sound card with the DAQ( data acquisition), it is found that a real-time and high SNR( signal noise ratio) sound signal acquisition system can be designed using the sound card in computer.
The Virtual Instrument based on PC sound card has the virtues of low cost and powerful generality，and the sound card can take the place of the plug-in data-acquisition board on low-frequency condition . In this article, the virtual double-traced storage oscilloscope based on sound card, whose function and interface were designed according to the actual oscilloscope, was developed using Virtual Instrument soft are LabVIEW and its digital sound record nodes.
This article designs a kind of simple double channel oscilloscope with the ordinary 16 sound card. It can gather the signal. Transfer through LabVIEW sound function that oneself offer sonic card can show the wave form of the input signal. Utilizing left and right sides pairs of sound channel of sound card to dispose many pieces of sonic card walk abreast job can gather a lot of multi-channel signal. Therefore the data acquisition system structuring the low cost with the sonic card is really feasible.
Keywords: virtual instrument; sound card; oscilloscope; acquisition system
发表于 20:50
ZXX223 论文字数:12216,页数:31