油水两相流电容层析成像系统电容测量电路的设计

A Novel Circuit for Measuring Oil-water Two-phase Flows Using Electrical Capacitance Tomography system

微小电容检测是电容层析成像技术的一个关键和难点。针对油水两相流电容层析成像系统的具体要求,本文研制一种微小电容交流测量电路。电容测量电路的静态测量误差小于0.2%,漂移为0.05% /小时。实验结果表明满足使用要求。

Electrical capacitance tomography is the main trend of technology, in which how to measure the low value capacitance is the key issue of implementation. For this purpose, a novel measurement circuit for electrical capacitance tomography system is presented in this paper. Experiments indicate that static error is less than 0.2% for capacitance measurement with 0.05% of drift per hour. Experimental results verify the performance of this circuit quite satisfactory