双电压激励法在电容层析成像系统中的应用

The Application of the Dual Potentials Excitation Method in Electrical Capacitance Tomography System

针对电容层析成像技术在管道流体监测方面存在中心部位信噪比低、边缘效应大以及识别精度低的缺点,提出一种双电压激励方法来提高检测区域中心的检测信号强度。采用COMSOL Multiphysics建立了16电极外置传感器的有限元模型,分别采用常规单电压激励法和双电压激励法进行仿真,并进行试验对比,结果表明:相对传统单电压激励法,双电压激励法能够改善管内区域电场和电势分布均匀性,提高中心区域信号强度及灵敏度水平,从而提高了监测识别精度。

In order to solve the defects of poor signal-to-noise ratio in the central area,edge effects,and low recogni-tion accuracy of electrical capacitance tomography in tube fluid monitoring,the dual potentials excitation method is proposed to improve the detection signal strength at the central area. The finite element model of a 16 electrode ex-ternally mounted sensor is established using software COMSOL Multiphysics,and simulations are performed by us-ing conventional single-voltage excitation method and the proposed dual potentials excitation method,respectively. And the results are compared by test,the results show that compared with the traditional single-voltage excitation method,the dual potentials excitation method can improve the uniformity of the electric field and potential distribu-tion,and lead to the detection signal strength and sensitivity level of the central region within the tube an obvious improrement,so the fluid monitoring recognition accuracy is increased.