基于PXI总线数据采集系统设计.docVIP

摘 要 虚拟仪器是在计算机基础上通过增加相关硬件和软件构建而成的、具有可视化界面的仪器，它融合了测试理论、仪器原理和技术、计算机接口技术、高速总线技术以及图形软件编程技术等于一体，利用计算机强大的数字的处理能力来实现仪器的诸多功能，打破了传统仪器的框架，形成了一种新的仪器模式。 本文首先阐述了测控技术和虚拟仪器技术的现状及以后的发展趋势，探讨了虚拟仪器的相关技术、LabVIEW的相关知识，然后阐述了有关数据采集的理论，给出了数据采集系统的框图和硬件结构图。在分析本设计功能的基础上，介绍了程序模块化设计、数据库相关知识、LabVIEW的多线程等技术，最后给出了设计的前面板及程序框图。 本设计采用了NI-PXI 6281数据采集卡，利用虚拟仪器及其相关技术实现了多通道数据采集。该系统具有多路采集、实时显示、存储管理与密码保护等功能。 关键词：虚拟仪器；数据采集；MySQL；LabVIEW Abstract Virtual instrument is based on computer related hardware and software by increasing the building made with a visual interface of the instrument, which combines the test theory, theory and technology equipment, computer interface technology, high-speed bus technology and graphics software programming technology is equal to one, the use of powerful digital computer processing power to achieve the instruments many features, breaking the traditional instruments of the framework, the formation of a new instrument model. This paper describes the measurement and control technology and virtual instrument technology status and future development trend of related technology of virtual instrument, LabVIEW related knowledge, and then expounded on the theory of data acquisition, data acquisition system is given and the hardware block diagram structure. In the analysis of the design features, based on the procedures introduced modular design, database-related knowledge, LabVIEW multithreading technology, given the design front panel and block diagram. This design uses a virtual NI-PXI 6281 data acquisition card, the use of virtual instruments and related technology to achieve a multi-channel data acquisition. The system has multi-channel acquisition, display, storage management and password protection. Keywords: Virtual Instrument, DAQ, MySQL, LabVIEW 目 录 摘 要 I Abstract II 第1章 绪论 1 1.1 课题来源及研究的目的和意义 1 1.2 国内外在该方向的研究现状及分析 2 1.2.1 测控技术的国内外现状 2 1.2.2 虚拟仪器的国内外现状 3 1.3 本设计所做的工作 5 第2章 虚拟仪器 6 2.1 虚拟仪器的相关技术 6 2.1.1 虚拟仪器的概念 6 2.1.2 虚拟仪器的特点及优势 6 2.1.3 虚拟仪器和传统仪器的比较 7 2.1.4 虚拟仪器的硬件技术