摘要
针对井下输油管道内原油黏度的在线测量问题,提出了一种小型化活塞式黏度测量方法.采用永磁活塞,在小型测量腔内的被测液体中,被线圈电磁力驱动而进行直线式往复运动;搭配专用电路系统及传感模块,基于电磁感应效应,通过检测叠加在线圈驱动电压中的电磁感应信号,获取活塞的往复运行时间,从而推算液体黏度.黏度测头主要由壳体、线圈和永磁活塞构成,结构简单,易于实现小型化;电路模块主要由线圈控制电路、感应信号检测电路及通信部分组成,结合上位机处理程序,可实现感应信号的高精度采集、处理及测量.通过实验研究,分析了驱动信号周期与系统稳定性之间的关系,并进行了测量系统标定,建立了"黏度-时间"数学模型.最终,通过与高精度黏度计测量结果进行比对,验证了该测量方法的有效性.
To solve the problem of on-line measurement of underground pipeline crude oil viscosity,a method based on principle of piston that was miniaturized was introduced.Driven by the electromagnetic coil,the piston moved in the liquid within a small measuring cavity periodically and straightly.With special circuitry and sensor modules,based on electromagnetic induction,by measuring the electromagnetic induction signal which was added to the driving voltage,the reciprocating motion time of piston was measured to compute the viscosity of the liquid.Instrument probe is constituted of shell,coil and permanent magnet piston,which means that it is easy to be miniaturizated.Circuit module is constructed of control circuit of the coil,sensor signal detection circuit and communication components.Combined with PC processing,the electromagnetic induction signal can be collected,processed and measured precisely.The relationship between the system stability and the period of electromagnetic coil was studied through experiments.System calibration and the 'viscosity-time' mathematical model were accomplished.Finally,the efficiency of the measurement method was proved by comparative study with a viscometer of high accuracy.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2012年第9期820-823,共4页
Journal of Tianjin University(Science and Technology)
基金
国家自然科学基金资助项目(51175377)
精密测试技术及仪器国家重点实验室开放基金资助项目
关键词
永磁活塞
黏度
线圈
电磁感应
小型化
permanent magnet piston
viscosity
coil
electromagnetic induction
miniaturization
