摘要
探地雷达(ground penetrating radar,GPR)对非金属管道进行探测识别时,填埋在不同介质中的非金属管道雷达回波频率并不固定。为深入研究非金属管道的电磁波反射规律,文章建立了时域有限差分法(finite difference time domain,FDTD)正演模型,对不同埋深、不同填埋介质及不同入射波中心频率的情况进行正演计算,得出非金属管道在不同填埋介质中的探地雷达回波频率分布规律;进一步通过理论分析,得出回波频率中心变化的原因是由于管顶及管底电磁反射波相位发生了变化,并且不同中心频率的入射波会激发对应的回波频率。
When using ground penetrating radar(GPR)to detect the nonmetallic pipeline,it can be found that the GPR echo of nonmetallic pipeline in different landfill media is not always fixed.In order to study the properties of electromagnetic wave reflection of the nonmetallic pipeline,the finite difference time domain(FDTD)forward model is established.Using the model,frequency distribution of electromagnetic wave reflection of the nonmetallic pipeline is gotten by forward calculation with different depth,different landfill media and different incident wave.The result of theoretical analysis shows that phase change of wave reflection between the pipe top and pipe bottom is the reason of nonmetallic pipeline’s GPR echo frequency center drift.It can also be found that the incident wave with different center frequencies will excite corresponding echo frequencies.
作者
廖旭涛
洪天求
刘东甲
杨明武
曾昭发
LIAO Xutao;HONG Tianqiu;LIU Dongjia;YANG Mingwu;ZENG Zhaofa(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Urban Construction Design Institute Co.,Ltd.,Hefei 230051,China;School of Electronic Science and Applied Physics,Hefei University of Technology,Hefei 230009,China;College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,China)
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
2018年第4期490-496,526,共8页
Journal of Hefei University of Technology：Natural Science
基金
安徽省公益性地质(科技)资助项目(皖国土资[2013]242)
