公路地质雷达的应用.ppt

透地雷达工作原理 测距系统 Antenna TheoryofOperation ReflectionsareproducedwhentheenergypulseencountersamaterialwithdifferentdielectricconstantDielectricConstant Air 1Asphalt 3 5Concrete 6 8 DirectCoupling Reflection 2GHz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 Datacollectedinparallellinesat2footspacing24scans foot Top sidepictures TheHyperbolashape Thetwowaytraveltimeofthereflectionsfromtheobjectproducesthehyperbolashape Reflectionfromdirectcouplingtoasphalt Reflectionfromtransitionfromasphalttoconcrete Reflectionfromrebar UnprocessedBridgeData 1 5GHzGroundCoupledAntenna BridgeJoint Reflectionfrombottomofbridge 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 2 2GHz天线和1GHz天线分层比较 GeophysicalSurveySystems 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 2cm GeophysicalSurveySystems 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 GeophysicalSurveySystems Inc 2 2GHz天线和1GHz天线的测量记录比较深部路基反射层达到的深度为75cm 2 2GHzData 1GHzData 高频天线的分辨率总是高于低频天线的分辨率 GeophysicalSurveySystems Inc AnantennacalibrationfileiscollectedusingametalplateasaperfectreflectorHeightvariationsarerecordedalongwithcorrespondingmetalplateamplitude BumperJump BumperJumpfile AntennaCalibrationfile RoadScanGPRSystemHowdoesitwork 原始数据 Dataprocessedusinganimagingtechniquecalled migration Thistechniquecollapsesthehyperbolasintopointssothatindividualrebarcanbedistinguishedfromeachother Rawdata TimeZeroAdjustedandMigrated 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B1G