利用探地雷达的极化特性检测建筑物结构  

Application of Ground Penetrating Radar Polarization in the Concrete Structure Detection

作　　者：张文波[1] 魏文博[1] 景建恩[1] 贾正元[1] 

机构地区：[1]地下信息探测技术与仪器教育部重点实验室(中国地质大学),北京100083

出　　处：《吉林大学学报（地球科学版）》2008年第1期156-160,共5页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40674045);中国地质调查局项目(1212010511108)

摘　　要：探地雷达偶极子天线激发的是线性极化波,其主要极化方向与天线的长轴平行。接收天线对与其长轴平行的入射电场分量最敏感。对于高导圆柱体,当半径与波长之比较小时,其散射场TE极化的后向散射宽度要小于TM极化的后向散射宽度。通过桥梁结构检测实例证明,利用这种特性,在建筑物结构检测时,采用发射天线和接收天线平行、且垂直于钢筋走向的天线布置,可以减少浅部钢筋的散射,增强雷达剖面中对深部目标的辨识。Dipole ground penetrating radar （GPR） antennas radiate linearly polarized wave with the predominant polarization direction parallel to the long axis of the antenna. Receive antennas are very sensitive to the electric field component parallel to the long axis. For conductive cylinder,when theradius-to-wavelength ratio is small, the backscattering width of TE polarization is narrower than that of TM backscattering. Examples of bridge structure detection confirm that the antenna configuration in which the transmitting and receiving antennas are oriented parallel to each other and perpendicular to the long axis of the reinforcing bar can reduce the backscattering and enhance the potential of deeper target identification.

关 键 词：探地雷达 极化特性 结构检测 

分 类 号：P631.325[天文地球—地质矿产勘探]