The Study on Image Data Acquisition System for Electrical Capacitance Tomography System
The subject investigated in this paper is oil-water two-phase flow, an image data acquisition system for 12 electrodes electrical capacitance tomography (ECT) of oil/water two-phase flow is discussed. This paper introduces a novel integrated structure of the ECT system for a capacitance sensor, in which the capacitance-to-voltage conversion circuitry for each electrode directly onto the electrodes such that the leads and its stray capacitance are eliminated nearly. The principle and design of a new AC-based micro-capacitance measurement circuit (MCMC) of controllable exciting sine-wave signal amplitude is presented and implemented as well as in this paper. The immunity to stray capacitances of MCMC is discussed and analyzed. The results of experiment results show that the non-linear error is 0.248％, the repeatability error is 0.281％, static error is less than 0.3％ for capacitance measurement, and drift is 0.05％ per hour. The circuit not only overcomes the limitations of existing circuit but also satisfies the requirement of ECT system in linearity, resolution and stability by the analysis of test data. The reconstructed section image, which is on the basis of image data captured, is in accordance with the facts.
Yan LI Tianbo JIN Xiaoying MENG Deyun CHEN Liyong ZHANG
Harbin University of Science and Technology, China
国际会议
2nd IEEE Conference on Industrial Electronics and Applications(ICIEA 2007)(第二届IEEE工业电子与应用国际会议)
哈尔滨
英文
2007-05-23（万方平台首次上网日期，不代表论文的发表时间）