基于LabVIEW的多通道数据采集系统(大学本科方案设计书).docVIP

摘 要 虚拟仪器是将仪器技术、计算机技术、总线技术和软件技术紧密的融合在一起，利用计算机强大的数字处理能力实现仪器的大部分功能，打破了传统仪器的框架，形成的一种新的仪器模式。 本设计采用NI PCI-6221数据采集卡，运用虚拟仪器及其相关技术于多通道数据采集系统的设计。该系统具有数据同时采集、采集数据实时显示、存储与管理、报警记录等功能，最后使用Web技术实现了采集数据的远程访问。 本文首先概述了测控技术和虚拟仪器技术在国内外的发展及以后的发展趋势，探讨了虚拟仪器的总线及其标准、框架结构、LabVIEW开发平台，然后介绍了数据采集的相关理论，给出了数据采集系统的硬件结构图。在分析本系统功能需求的基础上，介绍了程序模块化设计、数据库、Web、多线程等设计中用到的技术，最后一章给出了本设计的前面板图。 本设计是虚拟仪器在测控领域的一次成功尝试。实践证明虚拟仪器是一种优秀的解决方案，能够高效的实现各种测控任务。 关键字：虚拟仪器；数据采集；MySQL；PHP；LabVIEW Abstract Virtual instrument(VI)is combines computer science,bus technology,software engeneering with measurement instrumentation techology,employes the computers powerful digtal process compability to realize main function of instrument.It breakes the mainframe of traditonal instrument and forges a new instrument pattern. This project use NI PCI-6221 DAQ(data acquisition) card,ingeniously applyes VI technology in the development of a Multi-channel data acquisition develoment and finally achieves a solution which can provide many functions including multi-channel and multi-parameter signal acquisition,huge measurement information storage and management,Alarm record, and Collecting data show that real-time.Finally the use of Web technology to achieve the Acquisition of data remote access. This paper Introduced in detail the test technology in the domestic and foreign development and the later trend of development, then introduced the virtual instruments development. Study and reseach deeply VIs concept,hardware configuration and software architechture.Then introduce the development platform--LabVIEW.Introduced the theory of data acquisition, which elaborated on the acquisition of hardware, the input signal conditioning, given the DAQ system structure of the hardware.Based on the analysis of the DAQ system on the basis of functional requirements, described in detail the design used in some software-related technologies, including procedures modular design, database technology, Web technology, multi-threaded technology.The final chapte