基于GMR傳感器的電渦流檢測系統(tǒng)開發(fā)及深層缺陷檢測的可靠性研究.pdf

1、浙江大學(xué)控制科學(xué)與工程學(xué)系碩士學(xué)位論文基于GMR傳感器的電渦流檢測系統(tǒng)開發(fā)及深層缺陷檢測的可靠性研究姓名：高揚(yáng)華申請學(xué)位級別：碩士專業(yè)：檢測技術(shù)與自動(dòng)化裝置指導(dǎo)教師：張光新黃平捷20100101AbstractAbstractInspectionofdefectsdeeplyburiedinmulti—layeredconductivestructuresisacomplexandurgentproblemtotackleinanumb

2、erofindustriesrangingfromaerospaceindustrytonuclearandpetrochemicalengineeringsBasedontheprincipleoflow—frequencyEddyCurrentTesting(ECT)，theexperimentalECTscanningsystemusingGiantMagneto—Resistance(GMR)sensorsandtherelia

3、bilityofinspectionofdeepflawsusingProbabilityofDetection(POD)theoryandTaguchimethodarestudiedThemainworkandinnovationsofthethesisareasfollows：1Theexcitingfrequencymustbedecreasedforthesakeofinspectingdeepseatedflawsdueto

4、theskin—effectofeddycurrentsFirstlytheGMRbasedECTprobeisdevelopedThentheautomaticcompensationmethodforzeropotentialoftheGMReddycurrentprobeisstudiedTheexperimentalresultsshowthattheGMRbasedprobehashighersensitivityanddet

5、ectionabilityfordeep—seatedflawsthanthecoil—typeprobe2TheProbabilityofDetection(POD)theoryisintroducedtoevaluatethereliabilityofECTTheprocessforbuildingthemodelofPODisdescribedindetail，especiallythePODmodelingbasedonthef

6、unctionmodelmethodTheapplicationshowsthatthereliabilityofinspectioncanbeefficientlyevaluated3TheTaguchimethodisstudiedforoptimizingtheexperimentaldesigntoimprovethereliabilityindeepseatedflawsdetectionineddycurrenttestin

7、gTheexperimentalresultsindicatethatallthefactorswhichaffecttheexperimentsaredeterminedandtheirinfluencesCanbeevaluatedusingthismethodTheoptimumparameterscanbefoundwiththeTaguchimethod，andthereliabilityisimprovedeffective

8、lyTheprobebasedonGMRandautomaticcompensationforzeropotentialimprovethedetectionabilityfordeep—seatedflaws，thereliabilityofinspectioncanbeefficientlyevaluatedbyPOD，theTaguchimethodimprovesthereliabilityindeep—seatedflawsd