【正文】 密級 : 基于虛擬儀器實施相位測量儀的設計 Phase Meter Design Based on Virtual Instrument 學 院：信息科學與工程學院 專業(yè)班級：通信工程 0803班 學 號 學生姓名： 指導教師： 年 月 畢業(yè)設計指導教師審閱意見 題目 ：基于虛擬儀器實施相位測量儀的設計 評語： 指導教師： （簽字） 年 月 日 畢業(yè)設計評閱教師審閱意見 題目 ： 基于虛擬儀器實施相位測量儀的設計 評語： 評閱教師： （簽字） 年 月 日 畢業(yè)設計答辯成績評定 專業(yè)畢業(yè)設計第 答辯委員會于 年 月 日審定了 班級 學生的畢業(yè)設計。 畢業(yè)設計題目： 畢業(yè)設計說明書共 頁，設計圖紙 張。 畢業(yè)設計答辯委員會意見： 成 績： 專業(yè)畢業(yè)設計答辯委員會 主任委員 （簽字） I 摘 要 測量相位的方法很多，大致可以分為模擬方法和數(shù)字方法兩類：模擬方法是先對多個相位差脈沖進行積分，然后再計算這多個相位差脈沖的寬度，再取平均值求相位，這種方法精度高，但是電路復雜；數(shù)字方法是直接用計數(shù)脈沖對相位差脈沖進行填充，然后計算計數(shù)脈沖的個數(shù)，根據(jù)計數(shù)脈沖的個數(shù)求相位差。由于數(shù)字方法需要高頻的計數(shù)脈沖，而一般的計數(shù)器的工作頻率有一定的限制，計數(shù)脈沖的頻率不可能很高，因此測量精度會受到限制，而且隨著被測信號頻率的提高。精度會進一步的下降。近年來隨著高速數(shù)據(jù)采集卡和虛擬儀器技術的不斷發(fā)展，采用軟件來代 替硬件電路進行相位的測量成為可能。利用計算機和高速采集卡進行相位側鏈不僅具有更大的靈活性，而且采用虛擬儀器技術可以有效地避免測量過程中由于溫漂、噪音及干擾信號的影響，從而使結果更加準確。 傳統(tǒng)測量儀器功能單一，多功能虛擬儀器是現(xiàn)代儀器技術的發(fā)展方向。利用Labview 設計一種利用虛擬相關法測量相位差計的虛擬儀器，該儀器以測量兩個同頻正弦波的相位差為基本功能，具備了測量信號頻率，顯示信號波形、相位差和產(chǎn)生標準信號等功能，體現(xiàn)了虛擬儀器高集成度，一機多用的特點。 虛擬儀器技術 就是利用高性能的模塊化硬件，結合高效靈活的 軟件 來完成各種測試、測量和自動化的應用。自 1986 年問世以來，世界各國的工程師和科學家們都已將 NI LABVIEW 圖形化開發(fā)工具用于產(chǎn)品設計周期的各個環(huán)節(jié)，從而改善了產(chǎn)品質(zhì)量、縮短了產(chǎn)品投放市場的時間，并提高了產(chǎn)品開發(fā)和生產(chǎn)效率。使用集成化的虛擬儀器環(huán)境與現(xiàn)實世界的信號相連，分析數(shù)據(jù)以獲取實用信息，共 享信息成果，有助于在較大范圍內(nèi)提高生產(chǎn)效率。虛擬儀器提供的各種工具能滿足我們?nèi)魏雾椖啃枰? 本題目屬于應用類，設計主要內(nèi)容利用互相關分析法實現(xiàn)相位差檢測，在虛擬儀器設計平臺上仿真實現(xiàn)，結合原理和公式進行數(shù)據(jù)計算分析，充分利用了 LABVIEW 的性能。 關鍵詞：相關法；相位差；虛擬儀器； LABVIEW II Abstract There are a lot of methods for measuring phase. Can be roughly divided into two kinds of simulation method and digital method： The simulation method is first to multiple phase difference pulse points will be given. And then calculate the pulse width of the multiple phase difference. Take again for average phase but the circuit plexity。 the digital method is the direct use of count pulse to pulse phase difference filling. And then calculate the number of counting pulses. According to count the number of the phase pulses difference. Due to the high frequency of the digital method .And the general counter the working frequency of to have certain restriction. Count the frequency of the pulse can not be very high. So the measurement accuracy could be limited. In recent years with highspeed data acquisition card and virtual instrument technology continues to evolve. Accuracy will further decline. In recent years, with high speed data acquisition card and the development of the virtual instrument technology. The software instead of hardware circuit phase measurement possible. Using a puter and highspeed data acquisition card for phase side chain has not only more flexibility. And with the virtual instrument technology can effectively avoid measurement process temperature drift due to the influence of the noise and the disturbance signal. And make the result more accurate. Traditional measuring instruments function of a single. Multifunctional virtual instrument is the development direction of modern instrument technology. Using Lab view to design a virtual method to measure the phase difference meter, virtual instruments the instrument to measure the two basic functions of the same functions of the same frequency of the sine wave phase difference .With the measured signal frequency. Display the signal waveform, phase and produce stance standard signal functions. Reflects the high level of integration of virtual instruments. One machine with multiple functions. The virtual instrument technology is the use of highperformance modular hardware, bined with efficient and flexible software to plete a variety of test, measurement and automation applications. Since the 1986 years since the advent. III All countries in the world of the engineers and scientists would have the NI LABVIEW graphical development tools used for product design cycle every section. Thereby improving produce quality, shorten product time to market and improve product development and production efficiency. Use integrated virtual instrument of environment and the real world of the signal is linked together, analysis of data in order to obtain useful information, share information results. Help to improve production efficiency in a wide range. The virtual instrument provides a variety of tools able to meet any project need. This topic of belongs to the application. Design using crosscorrelation analysis to achieve the phase difference detection. In the simulation platform virtual instrument design, bined with the principles and formulas for data calculation and analysis. Take full advantage of the performance of the LABVIEW. Keywords: Correlation。 Phase difference。 the virtual instrument。 Labview IV 目 錄 摘 要 ....................................................................................................................... I Abstract ......................................................................................................................... II 第 1 章 緒 論 ...............................................................................................................1 引言 .................................................................................................................1 研究目標 .........................................................................................................2 工作內(nèi)容 ..............................................