基于Labview虚拟示波器的设计 毕业论文_精品.doc

基于LabVIEW虚拟示波器的设计 摘 要 当今世界信息与计算机技术发展日新月异，软件开发技术更是不可同日而语。在数据采集、实时分析与处理、显示与存储等方面，基于计算机的虚拟仪器技术比传统仪器有着明显的优势。由于传统仪器功能单一且价格长期居高不下，计算机性价比却不断提升，因此虚拟仪器的发展已是大势所趋。美国NI公司率先发起对虚拟仪器的研究与开发，建立了LabVIEW软件开发平台。以计算机为辅助的虚拟仪器技术，推动了传统仪器朝着智能化、数字化、网络化、模块化、人性化的方向发展。本文基于LabVIEW虚拟仪器开发平台，设计虚拟示波器界面，实现数据采集、滤波处理、时域分析、频域分析、波形存储与读取等功能，程序调试、演示设计结果，分析系统性能。 关键词 虚拟仪器，虚拟示波器，频域分析，数据采集 ABSTRACT In the contemporary world, information and computer technology develop rapidly with each passing day. The Software Development Technology is quite different, too. Compared with the traditional instrument technology, the virtual instrument technology based on computer has more advantages from the aspects of data acquisition, real-time analysis and processing, display and storage. Because of traditional instruments’ single function and high price for always and the continuous improvement of computers’ cost performance, the technology of virtual instrument is irreversible. The NI (National Instrument) took the lead in the technology of virtual instrument research and development, and established the LabVIEW software development platform. The technology of computer-assisted virtual instrument promoted the traditional instruments to the direction of intelligent, digitizing, networking, modular and user-friendly. This article, based on LabVIEW virtual instrument development platform, design virtual oscilloscope interface and realize the function of data acquisition, filtering process, time domain analysis, frequency domain analysis, waveform storage and recall, and debug program, illustrate design results, analyze the system performance. KeyWords: Virtual instrument, Virtual oscilloscope, Frequency domain analysis, Data acquisition 目 录 1绪论 1 1.1前言 1 1.2设计背景与意义 1 1.3国内外现状 2 1.4设计研究方案 2 2.虚拟仪器概述 3 2.1虚拟仪器系统的组成 4 2.2虚拟仪器的构成 5 2.2.1虚拟仪器的硬件系 5 2.2.2虚拟仪器的软件系统 5 2.3虚拟仪器与传统仪器优缺点对比 6 3.LabVIEW的软件概述 7 3.1LabVIEW软件的特点 7 3.2 LabVIEW程序的构成 8 3.3 LabVIEW的操作选板 10 4传统示波器与虚拟示波器 13 4.1传统示波器 13 4.1.1传统示波器工作原理 13 4.1.2传统示波器的分类 15 4.2虚拟示波器