摘要
基于电容敏感原理设计的数字化电容层析成像(ECT)系统,利用有限元法,分析了阵列电极结构对敏感场分布的影响,通过优化设计和仿真试验,改善了敏感场分布的均匀性;构建了以数字信号处理器(DSP)为核心、现场可编程门阵列(FPGA)协同工作的12电极的数字化ECT系统,提出了由离线预迭代和在线一步成像所构成的新的图像重建算法——预迭代法,其成像速度及精度均明显得到提高。
Based on the basic principle of electrical capacitance sensing, a digitalized electrical capacitance tomography （ECT） system is designed. The effect of the structure parameters of array electrode on the symmetrical sensitivity distribution is also analyzed by finite element method. Through optimum design and simulation experiment, the homogeneity of the sensing field distribution is improved. A 12-electrode digital ECT system including core of digital signal processor （DSP） and the field program mable gate array （FPGA） devices is developed. Meanwhile, a new reconstruction algorithm, which divides the process Of reconstruction into two steps, i.e. pre-iteration method off-line and one step image on-line is presented. It can improve both the high data acquisition speed and the high image resolution.
出处
《计量学报》
EI
CSCD
北大核心
2007年第3期253-256,共4页
Acta Metrologica Sinica
关键词
计量学
电容层析成像
预迭代法
数字化
阵列电极
Metrology
Electrical capacitance tomography
Pre-iteration algorithm
Digitalized system
Array electrode
