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1、重庆大学硕士学位论文II英文摘要ABSTRACTX-raythicknessmeasurementiswidelyusedinthemetalstripthicknessmeasurement.However,multienergyspectrumcharacteristicsofX-rayandbeamhardeningeffecthavebroughtdifficultiestotheX-raythicknessmeasurement.Therefore,toobtainhighlyaccuratemeasurementresults,itisveryimportanttostudythe
2、methodsofX-raythicknessmeasurement.ThelimitationsofconventionalX-raythicknessmeasurementalgorithmsandthecausesofbeamhardeningareanalyzed.AccordingtotheX-rayattenuationlaw,wederivetherelationshipbetweenlineattenuationcoefficientandthethicknessofmeasuredobject.Basedonthis,weproposeanegativeexponential
3、fittingcalibrationcorrectionalgorithm,whichcanbeusedinX-raythicknessmeasurement.WeuseMonteCarlotosimulatetheexperimentalmodel,andverifytherelationshipbetweenlineattenuationcoefficientandthethicknessofmeasuredobject.Then,weusetheCD-300BXRlow-energyX-rayindustrialCTsystemasX-raythicknessmeasurementsys
4、temtotheactualthicknessmeasurementexperiments,andverifythecorrectnessofnegativeexponentialfittingcalibrationcorrectionalgorithm.Moreover,weanalysisofthefactorsthatmayaffecttheaccuracyofthethicknessmeasurementundertheproposedmethod,andtheconclusionisgivenbytheexperimentalresults.InMonteCarlosimulatio
5、ns,weuseEGSnrctosimulatetheX-raysource,whichcangettheX-rayspectroscopy.Wemodifythetutor2ppcodetosatisfytherealisticsimulationprocess,usePEGStogetmaterialdatafileoftheirradiatedmaterialsubstance,andwriteprogramofthedetectormodules,whichisbasedontheCD-300BXRlow-energyX-rayindustrialCTdetectorsystem.Ba
6、sedontheabovesteps,weestablishaMonteCarlosimulationmodelofCD-300BXRlow-energyX-rayindustrialCTsystem.Thus,therelationshipbetweenlineattenuationcoefficientandthethicknessofmeasuredobjectiscompletedhere,whichverifythevalidityofnegativeexponentialfittingcalibrationcorrectionalgorithm.Duringthethickness
7、measurementexperiment,X-raysourceirradiatetoarcsteelladdermodel.BychangingenergyoftheX-raysource,weanalysistheinfluenceofenergyonthethicknessmeasurement.Bychangingmaterialofobject,weanalysistheinfluen
