基于LabVIEW的数据采集系统研究

基于LabVIEW的数据采集系统研究(论文12000字)
摘要：虚拟仪器是在计算机技术逐渐取得进展的情况下在传统仪器的基础上衍生出来的，它是一种仪器测量技术，通过计算机和仪器两者的结合，使仪器测量更加的便利，发展前景被人所看好。虚拟仪器可以由用户自定义功能模式，不再会像传统的仪器一样，受到生产厂家的限制，可以让使用者自由的组建程序模块，实现使用者想要的信号采集和处理。它的成本和传统的仪器相比低了很多，维护起来也相当的容易，而且功能也很全面，基本可以覆盖使用者想要的跟传统仪器一样的数据处理和显示。本次基于Labview的超声信号采集系统的设计与实现，主要分为三个模块，第一个模块是对采集到的超声信号的输入及调制，主要是用正弦AM调制法来实现，第二个模块是模拟超声信号的发生及调制，主要是用到labview的信号模拟板块来实现，第三个模块是数采卡采集超声信号，主要用到DAQ数据采集程序和NI USB-6210数采卡来实现数据的采集。通过设置信号的中心频率，幅值相位等参数，可以实现对超声信号的数据采集和处理。
关键词：虚拟仪器；LabView；数据采集
 
Research on data acquisition system based on LabVIEW
Abstract：Virtual instrument is derived from the traditional instrument on the basis of the progress of computer technology. It is a kind of instrument measurement technology. Through the combination of computer and instrument, the measurement of instrument is more convenient, It has a good future.The virtual instrument can be defined by the user's custom function mode. It will no longer be like the traditional instrument, which is limited by the manufacturer. It can make the user free to form the program module and realize the signal acquisition and processing that the user wants. Its cost is much lower than the traditional instrument, and its maintenance is quite easy, and the function is very comprehensive. It can cover the data processing and display that the user wants like the traditional instrument. The design and Realization of the ultrasonic signal acquisition system based on Labview mainly divided into three modules. The first module is the input and modulation of the ultrasonic signals collected. The main is to use the sinusoidal AM modulation method. The second module is the occurrence and modulation of the analog ultrasonic signal, mainly using the signal analog board of the LabVIEW. To realize the block, the third module is to collect ultrasonic signals by data acquisition card, mainly using DAQ data acquisition program and NI USB-6210 data acquisition card to achieve data acquisition. By setting the center frequency, amplitude phase and other parameters of the signal, data acquisition and processing of ultrasonic signal can be realized.
Key words：Virtual instrument；Labview；Data acquisition

目  录
1绪论    1
1.1背景    1
1.2国内外技术现状    1
1.3数据采集技术的介绍    1
1.4数据采集系统的构成    2
1.5虚拟仪器的介绍    3
1.5.1虚拟仪器的概念与特点    3
1.5.2虚拟仪器的优势    3
1.5.3虚拟仪器的组成原理    4
1.6 LabVIEW的开发环境    5
2设计思路及系统流程    5
3各部分软件程序设计    7
3.1前面板的设计    7
3.2整体程序框图的设计    9
3.3超声信号的采集    11
3.4.输入信号的调制处理    12
3.5生成信号的调制处理    13
3.6信号的滤波处理    13
3.7频谱分析    15
3.8信号存储部分设计    18
3.9AM正弦调制    19
3.10条件结构与For循环    20
4小结    21
参考文献    22
致谢    23