基于虛擬儀器的多功能信號(hào)發(fā)生器設(shè)計(jì)畢業(yè)論文-展示頁(yè)
2025-01-25 14:29本頁(yè)面
【正文】 字信號(hào)處理所代替，從而擴(kuò)充了儀器信號(hào)的處理能力，提高了信號(hào)測(cè)量的準(zhǔn)確度、精度和變換速度，克服了模擬信號(hào)處理的諸多缺點(diǎn)，數(shù)字信號(hào)發(fā)生器隨之發(fā)展起來(lái)。這時(shí)期的信號(hào)發(fā)生器多以軟件為主，實(shí)質(zhì)是采用微處理器對(duì)DAC的程序控制，就可以得到各種簡(jiǎn)單的波形。自60年代以來(lái)信號(hào)發(fā)生器有了迅速的發(fā)展，出現(xiàn)了函數(shù)發(fā)生器，這個(gè)時(shí)期的信號(hào)發(fā)生器多采用模擬電子技術(shù)，由分立元件或模擬集成電路構(gòu)成，其電路結(jié)構(gòu)復(fù)雜，且僅能產(chǎn)生正弦波、方波、鋸齒波和三角波等幾種簡(jiǎn)單波形，由于模擬電路的漂移較大，使其輸出的波形的幅度穩(wěn)定性差，而且模擬器件構(gòu)成的電路存在著尺寸大、價(jià)格貴、功耗大等缺點(diǎn)，并且要產(chǎn)生較為復(fù)雜的信號(hào)波形則電路結(jié)構(gòu)非常復(fù)雜。由于早期的信號(hào)發(fā)生器外型笨重，功能單一；數(shù)字信號(hào)發(fā)生器雖然有一定的功能擴(kuò)展，但價(jià)格昂貴，維護(hù)升級(jí)成本高，短時(shí)間內(nèi)難以普及應(yīng)用。隨著通信和雷達(dá)技術(shù)的發(fā)展，40年代出現(xiàn)了主要用于測(cè)試各種接收機(jī)的標(biāo)準(zhǔn)信號(hào)發(fā)生器，使信號(hào)發(fā)生器從定性分析的測(cè)試儀器發(fā)展成定量分析的測(cè)量?jī)x器。如果運(yùn)用虛擬儀器技術(shù)構(gòu)建系統(tǒng)，代替常規(guī)儀器、儀表，不但可以滿足實(shí)驗(yàn)教學(xué)的需要、節(jié)約大量的經(jīng)費(fèi)、降低實(shí)驗(yàn)室建設(shè)的成本，而且能夠提高教學(xué)科研的質(zhì)量與效率[2]。虛擬儀器技術(shù)的提出與發(fā)展，是21世紀(jì)自動(dòng)測(cè)試與電子測(cè)量?jī)x器技術(shù)發(fā)展的一個(gè)重要方向[1]。關(guān)鍵詞： 虛擬儀器，數(shù)據(jù)采集卡，信號(hào)發(fā)生器，LABVIEW The design of multifunctional signal generator base on virtual instrument technologyABSTRACT Virtual instrument technology 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 NI USB6211 data acquisition card. The virtual instrument technology has been utilized in the design of multifunctional signal generator. The system has ability to produce sine wave, square wave, and triangle wave, saw tooth wave and PWM (Pulse Width Modulation) 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 and 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 programming modes. Testify this article have great reference value.Key Words： Virtual Instruments， Data Acquisition Cards， Signal Generators， LABVIEW 目錄第一章 緒論 1 引言 1 信號(hào)發(fā)生器的發(fā)展史............................................ 1 虛擬儀器的發(fā)展趨勢(shì)............................................ 2 .3第二章 虛擬儀器 ...4 虛擬儀器的特點(diǎn)及機(jī)制 4...................................4...........................................4.....................................................5 I/O接口設(shè)備...................................................6.......................................................8................................................8.............................................8——LABVIEW..............................9.............................9第三章系統(tǒng)設(shè)計(jì)的硬件平臺(tái)...............................................11 PC機(jī).............................................................11.................................................11.........................................11(DAQ卡)的組成......................................12 NI USB6211數(shù)據(jù)采集卡........................................12第四章系統(tǒng)總體的設(shè)計(jì)與實(shí)現(xiàn).............................................13.........................................13.....................................................13.......................................13...............................................13.......................................13..................................16........
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