隧道壁湿润引起电磁波衰减率变化的研究  

Electromagnetic wave propagation attenuation change by wet tunnel wall

作　　者：刘会丽[1] 张志东[1] 魏占永[2] 

机构地区：[1]河北工业大学理学院,天津300130 [2]河北工业大学电器研究所,天津300130

出　　处：《西安科技大学学报》2005年第3期379-382,共4页Journal of Xi’an University of Science and Technology

基　　金：河北省高校重点学科建设项目

摘　　要：矿井隧道壁湿润会引起电参数改变,从而使电磁波传播衰减率发生变化。当频率略高于隧道截止频率时利用微扰法可知:不论是矩形隧道还是圆形隧道,隧道壁潮湿使电磁波的衰减率降低。当频率远高于截止频率时,利用传统公式法可知:矩形隧道中隧道壁湿润引起衰减增大;圆形隧道中E模式衰减率因电容率的增大而减小,其它各模式则因电容率的增大而增大。When electrical parameter is changd by wet tunnel wall, electromagnetic wave propagation attenuation will vary. When frequency slightly higher than cutoff, using perturbation method it is to know that tunnel wall wet make attenuation of electromagnetic wave lower not only in rectangular tunnel but al~ in circular tunnel. When frequency much higher than cutoff, using classical formulation method it is to know that tunnel wall wet make attenuation of electromagnetic wave increase in rectangular tunnel and make attenuation of other electromagnetic wave mode increase but TE mode with tunnel wall permittivity.

关 键 词：隧道 电磁波 衰减率 微扰法 电容率 

分 类 号：TD65[矿业工程—矿山机电]