多孔介质中流体流压检测系统的设计
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摘要
目前多孔介质中流体在微小流速驱替时流压值很小,现有的高精度压力传感器不能满足实验需求,造成测量微小流速渗流时的流压值误差较大,从而影响后期生产速度。为此,本文设计了一套基于LabVIEW虚拟仪器的多孔介质中流体流压检测系统,实现了对出口端微弱信号的采集,实时显示,保存与回放。提出整个系统的结构,建立了以压力传感器,放大电路,数据采集卡,和计算机为主体的硬件平台,利用LabVIEW 2017开发了采集与分析软件。给出了INA128放大芯片的使用方法,硬件连接电路,以及基于DAQmx的数据采集程序。该系统可以检测到多孔介质内流体流动瞬间或微小流速下渗流时的流压。
At present,the flow pressure value of the fluid in porous media is very small when the fluid displacing at a small velocity,and the existing high-precision pressure sensors cannot meet the experimental requirements,which often leads to a large error in the flow pressure value in the measurement of seepage at a small velocity,thus affecting the actual production speed. A set of detection system of fluid pressure in porous pedia based on LabVIEW is designed to realize the collection of weak signals at the exit end. Real-time display,save and playback. The structure of the whole system was proposed,and a hardware platform based on pressure sensor,amplifier circuit,data acquisition card,and computer was established. The acquisition and analysis software was developed by LabVIEW 2017.The use of INA128 amplifier chip,hardware connection circuit,and data acquisition program based on DAQmx are given. The system can detect the flow pressure in porous media when the fluid flow is instantaneous or at a small velocity.
At present,the flow pressure value of the fluid in porous media is very small when the fluid displacing at a small velocity,and the existing high-precision pressure sensors cannot meet the experimental requirements,which often leads to a large error in the flow pressure value in the measurement of seepage at a small velocity,thus affecting the actual production speed. A set of detection system of fluid pressure in porous pedia based on LabVIEW is designed to realize the collection of weak signals at the exit end. Real-time display,save and playback. The structure of the whole system was proposed,and a hardware platform based on pressure sensor,amplifier circuit,data acquisition card,and computer was established. The acquisition and analysis software was developed by LabVIEW 2017.The use of INA128 amplifier chip,hardware connection circuit,and data acquisition program based on DAQmx are given. The system can detect the flow pressure in porous media when the fluid flow is instantaneous or at a small velocity.
引文
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[2]杨宏.一种基于LabVIEW的微弱信号混沌检测方法[J].西安邮电大学学报,2013,18(1):70-73.
[3]黄豪彩,杨灿军,陈道华,等.基于LabVIEW的深海气密采水器测控系统[J].仪器仪表学报,2011,32(1):40-45.
[4]韦青燕,徐爱民.基于Labview和myDAQ的自动控制原理实验软件平台开发[J].实验室研究与探索,2014,33(11):132-135.
[5]司开波,黄健,杨亚东.基于压力桥小信号放大链路研究[J].实验室研究与探索,2016,35(10):143-146.
[6]郝丽,赵伟. MAX、DAQ助手及DAQmx VI之间的逻辑关系[J].实验室研究与探索,2012,31(6):82-85.
[7]张淼,程光耀,刘忠俊,等.基于labVIEW的喷墨压力采集系统设计[J].北京印刷学院学报,2017,25(2):18-21.
[8]张亚莉,马瑞峻,朱其科,等.基于LabVIEW和DAQmx的温室温度监控系统实验平台设计[J].实验室研究与探索,2016,35(9):63-66.
[9]孙晖,路扬,刘俊延.基于myDAQ和Multisim的信号与系统实验设计[J].实验室研究与探索,2013,32(12):13-15.
[10]章克来,朱海明.微弱信号检测技术[J].航空电子技术,2009,40(2):30-36.
[11]魏秋月,田雨.基于PIC18F4680单片机的动态小压力微弱信号检测[J].测控技术,2017,36(12):24-28.
[12]汪成龙,黄余凤,何宣,等.基于LabVIEW的应变片数据采集系统[J].电子测量技术,2018(14):97-101.
[13]张海燕,黄涛,文学.基于LabVIEW的车窗电机电流高速采集系统[J].自动化与仪器仪表,2017(2):58-61.
[14]徐科军.传感器与检测技术.第3版[M].北京:电子工业出版社,2011.
[15]陈后金.信号与系统[M].北京:高等教育出版社,2016.
[16]邓焱,王磊. LabVIEW 7.1测试技术与仪器应用[M].北京:机械工业出版社,2004.
[17]田雪,郑敏信.基于LabVIEW的光伏储能控制系统设计[J].国外电子测量技术,2014,33(12):53-56.
[18]张黎,蔡亮.基于LabVIEW的虚拟信号发生器的设计与实现[J].国外电子测量技术,2014,33(1):82-85.
[19]黄双成,李志伟.基于LabVIEW的无线温湿度监测系统设计与实现[J].电子测量技术,2014,37(6):82-84.
[20]王树东,何明. LabVIEW在数据采集系统中的应用研究[J].国外电子测量技术,2014,33(6):103-106.
[21]李红刚,张素萍.基于单片机和LabVIEW的多路数据采集系统设计[J].国外电子测量技术,2014,33(4):62-67.