【正文】
畢業(yè)論文 題 目: 基于虛擬儀器的信號發(fā)生器設(shè)計(jì) I 【摘要】 虛擬儀器是將儀器技術(shù)、計(jì)算機(jī)技術(shù)、總線技術(shù)和軟件技術(shù)緊密的融合在一起,利用計(jì)算機(jī)強(qiáng)大的數(shù)字處理能力實(shí)現(xiàn)儀器的大部分功能,打破了傳統(tǒng)儀器的框架,形成的一種新的儀器模式。 本設(shè)計(jì)采用 USB6211 數(shù)據(jù)采集卡,將虛擬儀器技術(shù)用于信號發(fā)生器的設(shè)計(jì)。該系統(tǒng)具有生成正弦波、方波、三角波、鋸齒波及 PWM 波的功能。 本文首先概述了信號發(fā)生器及虛擬儀器技術(shù)在國內(nèi)外的發(fā)展及趨勢,然后介紹了信號發(fā)生器的相關(guān)理論,給出了信號發(fā)生器的基 本原理框圖,并探討了虛擬儀器的總線及其標(biāo)準(zhǔn)、框架結(jié)構(gòu)、 LABVIEW 開發(fā)平臺。在分析本系統(tǒng)功能需求的基礎(chǔ)上,介紹了數(shù)據(jù)采集卡、 LABVIEW 的編程模式 等設(shè)計(jì)中所涉及到的硬件和技術(shù)。 本設(shè)計(jì)是虛擬儀器模擬真實(shí)儀器的嘗試。實(shí)踐證明虛擬儀器是一種優(yōu)秀的解決方案,能夠?qū)崿F(xiàn)各種硬件可以完成的任務(wù)。 【關(guān)鍵詞】 虛擬儀器 , 數(shù)據(jù)采集卡 , 信號發(fā)生器 , LABVIEW 【 Abstract】 Virtual instrument is formed by the instrument technology, puter technology, bus technology and software technology. Powerful digital processing’s ability of puter is used to achieve the main functions of instrument. Virtual instrument broke the framework of the traditional instruments, and built a new device model. This design uses USB6211 data acquisition card. The virtual instrument technology has been utilized in the design of signal generator. The system has ability to produce sine wave, square wave, and triangle wave, saw tooth wave and PWM wave. This article summarizes the development and trend of the signal generator and virtual instrument at home and abroad at first. And then introduces the theory of signal generator, gives a basic block diagram of signal generator, also the frame structure and LABVIEW development platform of the virtual instrument with the inquiry of the bus’s standard. Based on the analysis of this system’s functional requirements, this article introduces the hardware and technology which involved in design of the data acquisition card and the LABVIEW’s programming design is an attempt of virtual instrument to simulate the reality instrument. It shows the virtual instrument is an excellent solution to achieve the task which is achieved by traditional hardware in the past. 【 Key Words】 Virtual Instruments, Data Acquisition Cards, Signal Generators, LABVIEW 目 錄 1 緒 論 1 引言 1 信號發(fā)生器的發(fā)展 1 虛擬儀器的發(fā)展趨勢 2 課題的主要任務(wù) 3 2 虛擬儀器 4 虛擬儀器的概述 4 虛擬儀器的特點(diǎn)及優(yōu)勢 4 虛擬儀器與傳統(tǒng)儀器的比 較 5 虛擬儀器系統(tǒng)的組成 6 虛擬儀器 I/O 接口設(shè)備 6 虛擬儀器的軟件結(jié)構(gòu) 8 虛擬儀器的開發(fā)軟件 8 虛擬儀器的開發(fā)語言 8 圖形化虛擬儀器開發(fā)平臺 —— LABVIEW 9 基于 LABVIEW 平臺的虛擬儀器程序設(shè)計(jì) 9 虛擬儀器