公路地质雷达的应用.ppt

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1、透地雷达工作原理电源图形显示主机目标入射线反射线地面天线测距系统AntennaTheoryofOperationReflectionsareproducedwhentheenergypulseencountersamaterialwithdifferentdielectricconstantDielectricConstant:Air=1Asphalt=3-5Concrete=6-8DirectCouplingReflection2GHz架空天线检测桥面图用贴地天线检测路面，机场，桥面，隧道和市政管线等贴地天线施工方法Datacollectedinparallellinesat2

2、footspacing24scans/footTop-sidepicturesTheHyperbolashapeThetwowaytraveltimeofthereflectionsfromtheobjectproducesthehyperbolashapeantennaReflectionfromdirectcouplingtoasphaltReflectionfromtransitionfromasphalttoconcreteReflectionfromrebarUnprocessedBridgeData(1.5GHzGroundCoupledAntenna)BridgeJo

3、intReflectionfrombottomofbridge压实后的沙石底基层现场GeophysicalSurveySystems,Inc.标识层面位置的金属压条GeophysicalSurveySystems,Inc.在底基层上面铺设基层GeophysicalSurveySystems,Inc.标识层面位置的金属压条GeophysicalSurveySystems,Inc.用41081GHz天线测量得到的雷达记录底基层下基层基层GeophysicalSurveySystems,Inc.面层底1GHzData2.2GHzData磨耗层2.2GHz天线和1GHz天线分层比较Geop

4、hysicalSurveySystems,Inc.2.2GHz天线测出磨耗层厚度3.1cm，取芯实测磨耗层显示3.1~3.2cm,沥青层厚7.7-8.2cm磨耗层厚度3.1-3.2cmGeophysicalSurveySystems,Inc.1GHz天线和2.2GHz天线的实测记录比较1GHz天线2.2GHz天线GeophysicalSurveySystems,Inc.1GHz天线和2.2GHz天线在沥青厚度15-20cm的一段路面上的测量1GHz天线2.2GHz天线在面层结构中的隐患GeophysicalSurveySystems,Inc.2.2GHz天线和1GHz天线的测量记

5、录比较深部路基反射层达到的深度为75cm2.2GHzData1GHzData路基反射高频天线的分辨率总是高于低频天线的分辨率GeophysicalSurveySystems,Inc.AnantennacalibrationfileiscollectedusingametalplateasaperfectreflectorHeightvariationsarerecordedalongwithcorrespondingmetalplateamplitude“BumperJump”BumperJumpfileAntennaCalibrationfileRoadScanGPRSys

6、temHowdoesitwork?原始数据Dataprocessedusinganimagingtechniquecalled“migration”.Thistechniquecollapsesthehyperbolasintopointssothatindividualrebarcanbedistinguishedfromeachother.RawdataTimeZeroAdjustedandMigrated数据处理－偏移归位Automaticrebarpickingprocessisverifiedandeditedifnecessary人机交互解释人机联作自动层分析软件的功

7、能GeophysicalSurveySystems,Inc.总结A2.2GHz天线的用途:细致划分多层沥青层检测面层中的隐患分布测量面层各层厚度B1GHz天线比2.2GHz有更大的穿透深度，适合测量基层和底基层C人机联作自动分层软件适用于对高速测量中获得的海量数据剖面作分析和解释GeophysicalSurveySystems,Inc.