报道一种可方便、准确确定容器中油/水界面的新型探测技术.根据油水两相介电特性的不同，利用油/水界面处存在的双电层及zeta电势，基于静电感应原理，设计电压信号差分放大电路及检测系统. 铜质检测电极接触油/水界面时，界面zeta电势会在检测电极上感应出一定的电流，通过检测电流的变化，实现油/水界面的准确测量.根据电压脉冲信号出现时间以及检测电极下降速度，可快速确定油/水界面位置，并且脉冲信号幅值随油品的不同而不同.检测结果表明：该系统具有灵敏度高、操作方便等特点，可发展成为便携式仪器，可用于某些极端场合的现场液位探测.
Abstract
This paper reports a novel oil level detection technology which can quickly and accurately measure the oil/water interface. Due to the different dielectric constants of oil and water, a voltage signal differential amplification circuit and detection system are designed using electrical double layer(EDL) formed at the oil/water interface and zeta potential based on electrostatic induction principle. The zeta potential can induce a current when a metal electrode contacts the interface, and the induced current which reflects the contracts of the electrode with the interface can be detected by measuring current changes. According to the time of current pulse and the falling speed of the electrode, the position of the oil/water interface is determined. In addition, the amplitudes of the signal vary with the propertied of oil. Results show that the proposed method is simple and inexpensive without losing high accuracy and sensitivity, which can be applied to develop a portable device for infield application under some extreme circumstance.
关键词
油/水界面探测 /
静电感应 /
zeta电势 /
差分放大
Key words
oil/water interface detection /
electrostatic induction /
zeta potential /
differential amplification
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参考文献
［1］ 何兆民，油水界面检测与控制系统的研究［D］.青岛：青岛科技大学，2010.
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基金
国家自然科学基金面上项目（51079012）；中央高校青年骨干教师基金项目（3132013027）.
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