瞬變電磁探傷系統(tǒng)發(fā)射和接收部分的研發(fā).pdf

1、華中科技大學(xué)碩士學(xué)位論文瞬變電磁探傷系統(tǒng)發(fā)射和接收部分的研發(fā)姓名：廖明棟申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：機(jī)械工程指導(dǎo)教師：丁勁鋒20110520華中科技大學(xué)碩士學(xué)位論文IIAbstractTheTransientElectromagicMethods(TEM)wasusedinmineralexplationgeologicalresearchasaphysicaldetectionmethodinthebeginningthenitwasus

2、edinmunicipalengineeringcoalminedetection.ItisappliestheresearchofthedefectivemetalpipestheelectromagicacteristicswhichareexcitedbyTEManewnondestructivetestingmethodsbasedonthetransientelectromagicfield.isproposedasaresu

3、ltthistestingmethodcandetectcertainequipmentscomponentsthatthetraditionalmethodscannotachievemeetingthespecialneedsofprocessengineeringapplications.Basedonthetheeticalstudyanalysisthelaunchsystemsreceivingsystemsbasedont

4、ransientelectromagicdetectiontheyisdesigned.Thetransmittingpartofthenewsystemhasstrongemissionsignalhighdemofthewavefmofthetransmittercircuitturnofftime.Fthereceivingpartthetransientsignalsshouldhavedynamicrangeahighvolt

5、ageofpresignaldecayseverelyofthelatesignal.Additionallythenewsystemhashighdemsonacquisitionsystemwhichneedstobecollectedbyfloatingpointamplification.Theelectricalpartoftransientelectromagictestingloggingsystemistheemphas

6、isinthisresearchCircuitoftransmittingreceivingoftheelectromagicsystemaredesignedincludingtheopticalisolationcircuitthedrivercircuitofMOSFETthebridgepowerconvertercircuitinthetransmitcircuittheprecircuitthelowpassfilterin

7、gcircuitthesubamplificationcircuitthefloatamplifiedcircuittheADsamplingcircuitinthereceivecircuit.InthisthesisthetimingcontrolbasedontheFPGAisresearchedAvarietyofwavecanbetransmittedinthetransientelectromagicnondestructi

8、vetestinghasbeenachievedBesidesTheprogrammablemagnificationcanbecontrolledbyusingFPGAitistestedverifiedbysomeelectricaltestingexperiment.Keywds:TransientElectromagicMethods(TEM)Nondestructivetestingfloatingpointamplifica