基于ECT的占空比可调双阵列传感器设计  

Design of EGR Adjustable Dual Array Sensor Based on ECT

作　　者：马敏 范广永 王涛 MA Min;FAN Guang-yong;WANG Tao(College of Electronic Information and Automation,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学电子信息与自动化学院

出　　处：《计量学报》2019年第6期1057-1063,共7页Acta Metrologica Sinica

基　　金：国家自然科学基金委员会与中国民用航空局联合资助项目(U1733119);民航科技项目(20150220)

摘　　要：针对传统的ECT传感器占空比固定不可调节,不能改变测量极板与管道中心的距离,被测物体在管道内位置和大小变化不能选择合适的占空比,而不能得到效果更佳的重建图像。提出了一种占空比可调的新型传感器系统,占空比可从101调节到61,为了解决这种传感器系统无法加入径向基板引起相邻极板间耦合电容的干扰,设计了一种在测量极板与屏蔽罩之间加差分电极的系统,差分电极与测量电极同步调节。实验结果表明,管道内被测物体所在位置、大小不同时,选择的占空比也会不同,这种传感器系统可快速调节合适的占空比,得到最佳的成像效果,图像误差减小至0.25,相关系数提升至0.80。For the traditional ECT sensor s electrode-to-gap ratio(EGR)is fixed and can not be adjusted,the distance between the measuring plate and the center of the pipe cannot be changed,the measured object s position and size in the pipe can not select the appropriate electrode-to-gap ratio,and it can not get better reconstructed image.A novel sensor system with adjustable electrode-to-gap ratio is proposed.The electrode-to-gap ratio can be adjusted from 101 to 61.In order to solve the problem that this sensor system can not join the radial substrate and cause the interference of the coupling capacitances between adjacent plates,A system for adding a differential electrode between the measuring plate and the shield was designed,and the differential electrode was adjusted synchronously with the measuring electrode..The experimental results showed that the selected electrode-to-gap ratio(EGR)would be different along with the difference of the position and the size of the measured object.This sensor system can quickly adjust the appropriate duty cycle to obtain the best imaging effect,the image error(IME)decreased to 0.25 and the correlation coefficient increased(CORR)to 0.80.

关 键 词：计量学 电容层析成像技术 占空比 差分电极 传感器优化 

分 类 号：TB937[一般工业技术—计量学]