【正文】 xx 大學(xué)學(xué)士學(xué)位論文 I 基于單片機(jī)的流量信號檢測系統(tǒng)設(shè)計 摘要 在工業(yè)自動化中，任何控制系統(tǒng)都是從生產(chǎn)過程運(yùn)行的信息測量開始的，過程變量的自動檢測儀表是自動化系統(tǒng)革命的關(guān)鍵。和溫度、壓力一樣，流量也是生產(chǎn)過程中的重要變量。流量的精確測量在節(jié)能降耗、經(jīng)濟(jì)核算、自動控制等方面有著廣泛的應(yīng)用。渦街流量計以其自身的一系列優(yōu)點(diǎn)己經(jīng)成為流量測量儀表家庭中不可缺少的一員，在計量檢測中發(fā)揮著越來越大的作用。 本文研究一種適用于微小流量信號檢測的流量測量系統(tǒng)，該流量計是基于渦街流量計原理，即流體產(chǎn)生漩渦，漩渦分離產(chǎn)生應(yīng)力，漩渦的分離頻率等同于應(yīng)力的 變化頻率，通過測量應(yīng)力的周期變化知道漩渦分離頻率，從而準(zhǔn)確的反映被測液體的流速。 本文詳述了渦街流量計及壓電式傳感器的原理，并設(shè)計了信號調(diào)理電路，處理來自壓力傳感器的微弱電壓信號，使之能夠滿足單片機(jī)對輸入信號的要求。另外本文還設(shè)計了智能化單片機(jī)軟硬件系統(tǒng)并對系統(tǒng)進(jìn)行了功能擴(kuò)展，使整個系統(tǒng)不僅能夠準(zhǔn)確實(shí)時地反映被測流量的大小，而且能夠?qū)崿F(xiàn)信號的遠(yuǎn)程傳輸，為系統(tǒng)的智能化遠(yuǎn)程控制提供條件。 關(guān)鍵詞 流量計；流量；單片機(jī)；卡門渦街 xx 大學(xué)學(xué)士學(xué)位論文 II The designment of the flow signal detection system based on SCM Abstract In industrial automation, many control systems begin from the information from the production process automatic measuring instrument of the process variable is the key of automation system of revolution. Liking temperature, pressure, flow rate is an important variable of the production process. The flow has a wide application in energy consumption, precise measurement, economic accounting and automatic control. With its own vortex advantages, a flowmeter has bee an indispensable member of the family, which has a series of flow measuring plays a more and more important role in measuring. This article applies a flow measurement system, which is used in the minor flow signal detection of the flow measurement system. The flowmeter is based on the principle of vortex flow makes the separating of the vortex makes the stress. The frequency of the flow separation equals the stress knows the accurate flow by the frequency of the flow separation, which is calculated from the the stress frequency. This article describes the principle of vortex flowmeter and the piezoelectric sensors and designs the singal condition circuit, which process the weak signal from pressure sensor, to meet the requirements of the input signal chip. Additionally, this article also micro controller hardware and software design of the system and intelligent function extension of the system, the system can not only accurately measured by realtime reflect the size of the traffic signal, and to realize the remote transmission system, intelligent remote control to provide conditions. Keywords flowmeter。 flow。 SCM。 Karman vortex xx 大學(xué)學(xué)士學(xué)位論文 III 目錄 摘要 …… ........................................................................................................................ I Abstract ........................................................................................................................ II 第 1 章 緒論 ................................................................................................................. 1 本文的目的和意義 ............................................................................................ 1 流量檢測儀表的現(xiàn)狀 ........................................................................................ 1 流量檢測技術(shù)種類和特點(diǎn) ................................................................................ 2 渦街測量方法 .............................................................................................. 2 差壓測量方法 .............................................................................................. 3 電磁測量方法 .............................................................................................. 3 容積測量方法 .............................................................................................. 4 渦輪測量方法 .............................................................................................. 4 超聲 測量方法 .............................................................................................. 5 研究內(nèi)容 ............................................................................................................ 5 第 2 章 流量測量基本概念 ......................................................................................... 6 流量概念 ............................................................................................................ 6 流量測量參數(shù) .................................................................................................... 6 本章小結(jié) ............................................................................................................ 8 第 3 章 渦街流量計基本概念 ..................................................................................... 9 渦街流量計原理及模型 .................................................................................... 9 卡門渦街 ..................................................................................................... 9 物理模型 ................................................................................................... 10 應(yīng)用中的問題 ............................................................................................11 本章小結(jié) ............................................................................................................11 第 4 章 渦街流量計硬件設(shè)計 ................................................................................... 12 硬件電路總體設(shè)計 .......................................................................................... 12 傳感器部分電路 .............................................................................................. 13 傳感器 ....................................................................................................... 13 傳感器信號調(diào)節(jié)器 ................................................................................... 14 信號調(diào)理電路的設(shè)計 ...................................................................................... 16 單片機(jī)硬件電路及周邊設(shè)計 ........................................................................... 17 單片機(jī)介紹 ................................................................................................ 17 液晶顯示電路設(shè)計 ................................................................................... 19 芯片監(jiān)控電路的設(shè)計 .........................................................