电容层析成像系统微小电容测量电路的设计

The Capacitance Measuring Circuit for Electrical Capacitance Tomography System

微小电容检测是电容层析成像技术的关键和难点.依据油水两相流电容层析成像系统的具体要求,研制了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<0.2％,漂移为每小时0.05％.实验结果表明:该系统的设计满足使用要求.

The technology of electrical capacitance tomography is the main trend, and in this system the measurement of low value capacitance is one of the keys and the difficult problems. In view of electrical capacitance tomography system, a measurement circuit for electrical capacitance tomography system is presented. Static error is less than 0.2% for capacitance measurement, and drift is 0.05% per hour. Our experiment results show the circuit is satisfying.