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《Journal of Transducer Technology》 2004-12
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Capacitive array sensor for measuring moisture distribution in pressboard

DAI Heng-zhen~1, SUN Bao-yuan~2, HAN Wei~3, LI Wang-quan~2, LI Xiao-xiao~2 Dalian University of Technology,Dalain 116024,China; 2.Sch of Mech Eng,Dalian University of Technology,Dalian 116024,China; 3.China Dalian International Cooperation Holdings Ltd.,Dalian 116011,China)  
The dielectrometry method can be used to measure moisture distribution in transformer pressboard since the moisture affects the dielectric properties of pressboard.A array sensor which has sixteen fringe-field capacitive cells located in a substrate is developed.By using each cell in turn,each corresponding complex admittance is obtained and mapped into the moisture content at a certain position.The measuring system including this array sensor can be used to detect the moisture distribution over the measured pressboard online during the drying process,which has been proved with experiments.The principle and structure of the array sensor,as well as the measuring systems are explained.
【Fund】: 中国输变电行业技术攻关项目(Y98010211)
【CateGory Index】: TP212
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