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1、-------AbstractMagnetictestingtechnologyhasbeenwidelyusedinferromagneticmaterialstestingfieldwithitsadvantagesofdetectionspeedandsimpleoperation,butthecurrentresearchlargelyconfinedtotheorientationandquantitativeofdefects,andthequalitativeaspectsinthedefectanalysisforless.Thispaper
2、realizesthetwoandonehalfdimensionfieldsourceimagingusingtheimagingtechnologyandthemethodanalyticalcontinuation,andmakesthemagnetictestinghavetheadvantageofvisualization,sowe'lltalkaboutthequantitativeandqualitativetodefectonthatbasis.Thispaperaccordingtotheanalysisofmagneticfieldth
3、eory,fromtheangleoftransformationofgravityandmagnetic,expoundtotheformulaeofmagneticfieldpatternofthesphere,cylinder,cuboiddefectsect.andmadenewelaborationsignaltomagneticanomalyofdefects;Inmagneticanomalydataprocessing,ThispaperrealizesthetwoandonehalfdimensionfieldsourceimagingUs
4、ingthedownwardcontinuationandmulti-channelmagneticmethoddetector;theQ235steelswiththedefectsofthelevel
cylinderandtheuprightcylindersandcuboidareinspectedandvalidated,andtheresult
showsthat:themagneticanomalymeasuredcurveoftheinhomogeneousdefects
identicalwithoreticalanalysis,imagi
5、ngresultsnotonlycanaccuratelyreflectdefects
position,andcanbettermakethequantitativeandqualitativeanalysisfortheabove
severaldefectsizeandshape;Intheendofthispaper,theburiedpipelinewithcorrosion
-----------defectsandgroovedefectdetectionimagesshow:inthetestplane1.2mfromthepipe,
Thi
6、smethodnotonlycaneffectivelydetectthelargedefectsofcorrosiondepthfor
2mm,anddetectioneffectmoreapparentforthesmallareacorrosiondefectsfor
corrosiondepth5mm;thedetectionofthepipelinewithgroovedefectsresultsshowthat:
thismethodcaneffectivelydetectedthelongitudinaldefectswithnolesstha
7、nlength
30mm,thisresultcanachievethedesiredobjective,andwillimpeltheburiedpipeline
trenchlessdetectiontechnologydevelopment.Keywords:magnetictesting,analyticcontinuation,imagingoffieldsource,transformationofgravityandmagnetic,magneticanomalyII-----------南昌航空大学硕士学位论文目录目录第1章绪论.......
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