【正文】 m, using pressure sensors, pressure on the 4way data collection, analysis and processing, storage, display, realization of the curve of pressure data and digital realtime display, and has The more limited alarm functions, and statistical analysis of data using EXCEL toolbox to achieve report output. The system consists of three basic hardware ponents: pressure sensors, data acquisition card, PC machine. Among them, pressure measurement using AK4 type digital pressure sensor, the sensor output 420mA signal into the conditioning circuit is converted to 15V voltage signal, and then into the LabJack U12 data acquisition card will be analog to digital conversion, and enter the to a PC machine and then use the PC, the LABVIEW graphical programming software to input the output voltage signal processing and displays, and signal analysis of the overrun alarm signal to play. Key words: Pressure monitor Labview Data acquisition 目 錄第一章 緒論.............................................................................................................................5 引言...................................................................................................................................5 課題的提出與意義 ..........................................................................................................6 課題的實現(xiàn) .......................................................................................................................6第二章 壓力監(jiān)測系統(tǒng)總體設(shè)計.............................................................................................7 設(shè)計思路 ...........................................................................................................................7第三章 壓力傳感器.................................................................................................................9 壓力傳感器定義 ..............................................................................................................9 壓力傳感器分類 ..............................................................................................................9 傳感器的使用原則 ..........................................................................................................9 傳感器的選用 ................................................................................................................11 傳感器的選用..........................................................................................................11 AK4 型壓力傳感器特點 ........................................................................................12 AK4 型壓力傳感器性能技術(shù)指標(biāo) ........................................................................12第四章 數(shù)據(jù)采集...................................................................................................................13 數(shù)據(jù)采集 .........................................................................................................................13 數(shù)據(jù)采集卡 ......................................................................................................13 簡介 .......................................................................................................14 數(shù)據(jù)采集硬件配置...................................................................................................15 數(shù)據(jù)采集的軟件驅(qū)動...............................................................................................15第五章 虛擬儀器的概述.......................................................................................................17 虛擬儀器的概念 ............................................................................................................17 虛擬儀器的組成 ............................................................................................................18 虛擬儀器的特點及優(yōu)勢 ................................................................................................20 虛擬儀器與傳統(tǒng)儀器的比較 ........................................................................................21第六章 軟件設(shè)計...................................................................................................................23 程序主界面 .....................................................................................................................23 程序各部分設(shè)計 .............................................................................................................24 存盤程序的后面 板界面...........................................................................................24 Labjack 信號采 集 .....................................................................................................25 信號采集的通道設(shè)置..............................................................................................26 壓力監(jiān)測功能的實現(xiàn) .....................................................................................................274總 結(jié)...................................................................................................................................29謝 辭...................................................................................................................................30參考文獻...................................................................................................................................315第一章 緒論 引言壓力是人們所熟知的名詞，在認(rèn)知中的壓力定義有很多,施加在物體上的力則是普遍認(rèn)為。本系統(tǒng)包括三個基本硬件部分：壓力傳感器，數(shù)據(jù)采集卡，PC 機。實現(xiàn) 4路壓力的實時監(jiān)測、波形顯示。其運用配套的虛擬儀器開發(fā)軟件，借助 PC 機超強的計算處理能力而被廣泛的運用于工廠的各種數(shù)據(jù)監(jiān)測與處理。摘 要 生產(chǎn)過程參數(shù)的智能監(jiān)測是實現(xiàn)自動化的重要標(biāo)志，監(jiān)測到的數(shù)據(jù)需要進行實時采集、傳送、處理。隨著計算機技術(shù)、通信技術(shù)的迅速發(fā)展，虛擬儀器率先由美國于20 世紀(jì) 80 年代末研制成功，它是計算機系統(tǒng)與儀器系統(tǒng)技術(shù)相結(jié)合的產(chǎn)物。本設(shè)計為多通道壓力監(jiān)測系統(tǒng)，用來監(jiān)測來自各處不同的壓力變化情況。具體為應(yīng)用 LabVIEW 圖形化編程軟件和 LabJackU12 數(shù)據(jù)采集卡設(shè)計 4 通道壓力監(jiān)測系統(tǒng)，采用壓力傳感器，對 4 路壓力數(shù)據(jù)進行采集、分析處理、存儲顯示，實現(xiàn)壓力數(shù)據(jù)的曲線和數(shù)字實時顯示，并具有超限報警功能，并對數(shù)據(jù)進行統(tǒng)計分析，利用 EXCEL 工具箱實現(xiàn)報表輸出。其中，壓力測量利用 AK4 型數(shù)字壓力傳感器，傳感器輸出的 420mA 信號送入調(diào)理電路轉(zhuǎn)換為 15V電壓信號，再送入 LabJack U12 數(shù)據(jù)采集卡將模擬量到數(shù)字量的轉(zhuǎn)換，并輸入到 PC 機中，然后利用 PC 機中的 LABVIEW 圖形化編程軟件將輸入的電壓信號處理輸出并且顯示，并對信號進行分析對超限信號起到報警功能。在醫(yī)學(xué)應(yīng)用中壓 力 則 定 義 為 不 是 一