不受分布电容影响的ECT检测系统  

ECT detecting system without influence of distribution capacity

作　　者：刘存[1] 李涵[1] 常璐[1] 

机构地区：[1]沈阳工业大学信息科学与工程学院,沈阳110023

出　　处：《沈阳工业大学学报》2006年第4期434-437,共4页Journal of Shenyang University of Technology

摘　　要：目前流动层析成像技术是公认的最具前景的多相流参数检测途径,其发展主流之一是电容层析成像技术,其中小电容检测是该技术的关键和难题之一.被测小电容经过C/V变换电路后转换成的高频信号与另一路严格同频同相的信号进行同步检波而得到被测信号,因此硬件装置中移相电路的输出必须精确地与检测信号达到同步.但是在ECT系统中,存在大量的分布电容,不同的分布电容又产生不同的相位,所以这些分布电容对检测系统有很大的影响.介绍了一种不受分布电容影响的电容检测系统,该系统应用相干技术来消除分布电容的影响,从而提高了ECT检测系统的准确性.At present, the technology of flow tomography is generally acknowledged as a most promising means for multi-component liquids parameters detecting. Electrical capacitance tomography technique is among mainstream technology trend. In electrical capacitance tomography system, measuring of low value capacitance is one of the crucial and difficult problems, where output of phase shift circuit in hardware device is required to synchronize with detected signal in high precision. But in electrical capacitance tomography system, because there exists large amount of distribution capacity and different distribution capacity produces different phase, the distribution capacity can influence detection system greatly. A kind of ECT detection system without influence of distribution capacity has been introduced. Relevant technology to dispel the influence of distribution capacity has been used and thus the precision of ECT detection system gets enhanced.

关 键 词：电容层析成像 分布电容 相干技术 锁相环 交流激励 

分 类 号：TN06[电子电信—物理电子学]