Capacitance Measurement Circuit and the Determination of Parameters for Electrical Capacitance Tomography
It is one of the keys to how to eliminate the noises and the difficulty of the low capacitance measurement because there is a difference of about two levels between the capacitance Values and the coupling capacitance for ECT. The object of this paper majors in the research of 12-electrode oil-water two-phase flow ECT system, the data acquisition system is designed and the AC signals are demodulated by using the principle of phase sensitivity demodulation based on analyzing the principle of measurement in the ECT system. The key in the measuring process is discussed and the parameters of measurement circuit are chosen. The experiment results show that the sensitivity of circuit is 0.49974V/pF, non-linear error is 0.2630％ and the static measurement error is 0.248％. So the method is practical and the measurement of the low capacitance is more accurate.
Electrical Capacitance Tomography Phase Sensitivity Demodulation Low Capacitance Measurement Noises Error Analyses
You Han Zhongchang Liu
University of Science and Technology Beijing, Beijing, 100083 Harbin University of Science and Technology, 150080
国际会议
哈尔滨
英文
292-296
2010-08-01（万方平台首次上网日期，不代表论文的发表时间）