非闭合电极电容层析成像传感器在冻土测试中的应用  

Application of unclosed electrode electrical capacitance tomography sensor in measurement of frozen soil

作　　者：刘靖[1] 姜凡[2] 刘石[3] 

机构地区：[1]河南理工大学土木工程学院,焦作454000 [2]东华大学环境科学与工程学院,上海201620 [3]华北电力大学能动学院,北京102206

出　　处：《仪器仪表学报》2011年第2期363-368,共6页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(40501017)资助项目

摘　　要：为了实现电容层析成像技术对冻土冻结冰峰面的在线、非侵入测试,研制出了满足冻土测试要求的非闭合电极电容层析成像传感器,并对该种传感器的电容分布特性进行了实测;确定出了适合冻土测试的的高、低介电常数的标定物质;搭建了冻土一维冻结实验系统。对含水量8%的湿土样冻结过程的冰峰面迁移进行了电容层析成像测试,并利用IMNSNOF图像重建算法重建出了冻结过程各时刻的冻结截面物质分布图像,由图像可确定出冻土中已冻土、未冻区以及冰峰面的位置。电容层析成像测试结果与温度测试结果相吻合。To measure ice frontal surface in frozen soil using electrical capacitance tomography（ECT）,an unclosed electrode ECT sensor was developed to meet the requirement of measurement of frozen soil.The capacitance distribution of the sensor was tested;the demarcating material with high permittivity（for wet soil） and demarcating material with low permittivity（for dry soil） were proposed.A 1-D permafrost freezing experimental set-up was built up.The ice frontal surface migration during freezing process of the wet soil with 8 percent water was measured,and the material distribution images of the frozen soil sections in different time were reconstructed using IMNSNOF image reconstruction algorithm.From the images,the frozen area,unfrozen area and position of ice frontal surface are determined.The ECT measurement results are consistent with the results obtained from temperature tests.

关 键 词：电容层析成像 传感器 冻土 冰峰面 图像重建 

分 类 号：TM934.2[电气工程—电力电子与电力传动]