Sensitivity Analysis Of Adaptive Electrical Capacitance Tomography

Electrical capacitance tomography as a traditional process imaging technology is widely used in industrial two-phase flow or multi-phase flow visualization detection as well as the automotive manufacturing,bio-medical fields.In order to meet the requirements of modern production,three-dimensional electrical capacitance tomography imaging technology is gradually becoming one of the hot spots in the field of electrical imaging.In this paper,we review the three-dimensional electrical capacitance tomography at first.Adaptive electrical capacitance tomography was presented recently,and we focus on analyze its sensitivity distribution.A new method for rapid calculation of imaging sensor sensitivity value is proposed,and the sensitivity distributions corresponding to different voltage envelopes excitation is analyzed deeply.The paper's main work is as follows:(1)A fast imaging strategy is proposed for the problem of slow imaging speed in the adaptive electrical capacitance tomography system.Firstly,based on the basic model of electrostatic field in the field of adaptive electrical capacitance tomography,a fast sensitive field calculation method based on potential distribution is deduced.Then,two factors that affect the quality of the image are analyzed:the change of capacitance value and the sensitivity value.It is found that the change of capacitance value and the sensitivity value of the cross-layer plate are one order of magnitude higher than that of the adjacent layer.Then,a fast sampling method is proposed,that is,just the data between the plates and the inter-Board sampling.The simulation results show that the proposed method can guarantee the imaging quality under the premise of shortening the imaging time.(2)For ECVT and AECVT sensitivity distribution,including single-layer sensor and multi-layer sensor comparison.The ECVT sensor with the same physical structure is given the same amplitude excitation as the AECVT sensor and compares the corresponding sensitive field distribution.The simulation results show that the sensitivity of AECVT is slightly smaller than that of ECVT for ECVT and AECVT systems with the same physical structural and the excitation voltage.The sensitivity distribution is slightly more uniform than ECVT sensitivity distribution,but the sensitivity distribution is close to quality.(3)Analyze the variation of the sensitivity distribution under the excitation of different voltage envelopes for the adaptive electrical capacitance tomography..Firstly,the intrinsic relationship between the different voltage package and the horizontal sensitivity distribution of the adaptive electrical capacitance tomography sensor is discussed.The simulation results show that the sensitivity value is changed when the uniform voltage envelope and the non-uniform voltage envelope are changed.When the uniform voltage envelope changes non-linearly,the sensitivity distribution changes as follow.Next,analyze the change of longitudinal sensitivity distribution under the excitation of different voltage envelopes by the adaptive electrical capacitance tomography system.Increase the number of different amplitude voltage excitation at the same time and obtaining the corresponding longitudinal sensitivity distribution.The simulation results show that the sensitivity value decreases with the number of different amplitude voltages increases.The research work of this paper is mainly to analyze the sensitivity distribution of adaptive electrical capacitance tomography,and the result provides a meaningful theoretical reference for 3D electrical capacitance tomography imaging.