基于虚拟仪器的无纸记录仪的设计与实现毕业论文.doc

毕业设计论文 虚拟无纸记录仪 摘 要 关键词： Design of Virtual Paperless Recorder based on LabVIEW Abstract At present the virtual instrument used widely in the measure and automatic control area. It make much of computer technology, combines the virtual instrument’s hardware with software accomplish data acquisition, data analysis, then store the digital and display the result on the screen, achieve the function of traditional instrument. In this chapter the author used virtual instrument to design the virtual paperless recorder, it consists data acquisition, measurement, storage and display. We used the design of modularization software, each function can accomplish by one module. The software used in the paper is LabVIEW, it is a kind of software based on graphic language. The hardware of this design is the PCI6221 of data acquisition card. After debugging, the virtual paperless recorder by LabVIEW would complete data acquisition, wave storage, display and read the data which is stored. Moreover, this virtual paperless recorder also have the function of measurement about fmplitude, average and RMS values. It well explain the strong function of computer and the various design of software. Key words: Paperless recorder; Virtual instrument; Data acquisition; LabVIEW 目 录 摘 要 I Abstract II 第一章 绪论 1 1.1 虚拟仪器的概述 1 1.1.1 虚拟仪器的基本概念 1 1.1.2 虚拟仪器的构成 2 1.1.3 虚拟仪器的特点 3 1.1.4 虚拟仪器的现状和发展 3 1.1.5 虚拟无纸记录仪的介绍 5 1.2 课题研究的背景 5 1.3 课题研究的方法 6 第二章 虚拟无纸记录仪的总体设计方案 7 2.1 总体设计思路 7 2.2 软件开发平台 7 2.2.1 LabVIEW简介 7 2.2.2 LabVIEW的运行机制 8 2.2.3 LabVIEW的操作模板 10 2.2.4 调试技术 11 2.3 数据采集卡的选用 13 2.3.1 数据采集卡的简介 13 2.3.2 数据采集卡的主要组成部分 13 2.3.3 数据采集卡的参数设置 14 2.3.4 PCI6221数据采集卡 15 第三章 虚拟无纸记录仪的数据采集系统 17 3.1 数据采集系统的构成 17 3.2 数据采集的实现 20 3.2.1 信号类型 20 3.2.2 采样频率、抗混叠滤波器和样本数 21 3.2.3 信号调理的实现 25 3.2.4 采集信号的条件 26 3.2.5 信号的采集方法 27 第四章 虚拟无纸记录仪软件设计 29 4.1 主程序设计 29 4.2 数据采集模块 31 4.3 信号测量模块 34 4.4 波形的存储和读取模块 36 4.5 测试结果 39 结束语 43 参考文献 45 附录A 虚拟无纸记录仪前面板 47 附录B 虚拟无纸记录仪程序框图 48 致谢 49 绪论 虚拟仪器的概述 虚拟仪器的基本概念 所谓虚拟仪器，就是以计算机为核心的硬件平台上，其功能