文档名：基于Barker码脉冲压缩技术的钢板多阵元Lamb波电磁超声换能器设计与优化
摘要：为了解决传统Barker码脉冲压缩技术受脉冲功率放大器额定参数(占空比,最大脉冲宽度等)限制而导致的脉冲压缩效果下降、检测速度降低等问题,提出一种基于Barker码脉冲压缩技术的多阵元Lamb波电磁超声换能器(EMAT).建立了基于tone-burst信号激励-Barker码脉冲压缩技术的多阵元Lamb波EMAT检测过程的有限元模型,分析了永磁体的配置形式、阵元序列长度、激励信号周期数、曲折线圈匝数等因素对脉冲压缩后的主旁瓣比和主瓣宽度的影响,并进行了实验验证.结果表明:曲折线圈匝数为4和Barker码序列长度为13位的多阵元EMAT在配置3对外置永磁体后,其信噪比(SNR)可提高9.8dB.综合考虑检测回波的空间分辨率和SNR,多阵元Lamb波EMAT最佳参数为:曲折线圈匝数为10、激励信号周期数为11、Barker序列为13位,并配置3对外置永磁体.
Abstract：TraditionalBarkercodepulsecompressiontechnologyisconstrainedbyratedparametersofpulsepoweramplifiers(dutycycle,maximumpulsewidth),resultinginreducedpulsecompressioneffectivenessanddetectionspeed.Amulti-elementLambwaveElectromagneticAcousticTransducer(EMAT)basedonBarkercodepulsecompressiontechnologyisproposed.Inthismulti-elementEMAT,thecombinationofapermanentmagnetandameanderlinecoilisconsideredanindependentelement,andthedirectionoftheLorentzforceiscontrolledbythemagneticfielddirectionofthepermanentmagnetandthecurrentdirectionofthemeanderlinecoilineachgroupofarrayelements.Inthisway,theexcitedLambwavephase{0,180°}isconsistentwiththeBarkercodesequence{1,-1},ultimatelygeneratingLambwavesinBarkercodeform.Afiniteelementmodelforthemulti-elementLambwaveEMATdetectionprocessisestablishedbasedonBarkercodepulsecompressiontechnologywithtone-burstexcitation.Theinfluenceoffactors(permanentmagnetconfiguration,arrayelementsequencelength,excitationsignalcyclecount,andmeanderlinecoilturns)onpeak-sideloberatioandmainlobewidthafterpulsecompressionisanalyzed.Theresultsshowthatconfiguringexternalpermanentmagnetsimprovesthesignal-to-noiseratio(SNR)ofpulse-compressedsignalsaftersidelobesuppressionwhenthemulti-elementLambwaveEMATisexcitedbytone-burstsignals.TheSNRofthedetectionechocanbeincreasedby9.8dBwhenthemulti-elementEMATwithafour-turnmeanderlinecoilanda13-bitBarkercodesequencelengthisconfiguredwiththreepairsofexternalpermanentmagnets.Asthenumberofexcitationsignalcyclesincreases,themainlobewidthofthepulse-compressedsignalaftersidelobesuppressionexhibitsacontinuouslyincreasingtrend,andtheSNRinitiallyincreasesandthendecreases.AsthelengthoftheBarkersequenceincreases,theSNRofthepulse-compressedsignalaftersidelobesuppressionshowsacontinuouslyincreasingtrend.ConsideringthespatialresolutionandSNRofthedetectedecho,theoptimalparametersofthemulti-elementLambwaveEMATarea10-turnmeanderlinecoil,11excitationsignalcycles,a13-bitBarkersequence,andaconfigurationwiththreepairsofexternalpermanentmagnets.Thenewmulti-elementEMATsuccessfullygeneratesLambwavesinBarkercodeformwhenexcitedwithatone-burstsignal.Afterthepulsecompression,theLambwavesignaleffectivelysuppressessidelobesbycalculatingdelaytimeandperformingsidelobesuppression.Themulti-elementLambwaveEMATbasedontone-burstexcitationandBarkercodepulsecompressiontechnologyimprovesultrasonicsignals'SNRandspatialresolution.Whenappliedtoguidedwavedetectioninmetalplatesorpipeswithvaryingthicknesses,maintainingconsistentspacingbetweenarrayelementsiscrucialforpulsecompressioneffects.Ensuringuniformandconsistentmagneticfielddistributionforeacharrayelementisalsobeneficial.
作者：石文泽 李淇鑫 卢超 胡博 刘远Author：ShiWenze LiQixin LuChao HuBo LiuYuan
作者单位：南昌航空大学无损检测技术教育部重点实验室南昌330063
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(8)
分类号：TG115.28+5
关键词：电磁超声换能器 Barker码脉冲压缩 多阵元Lamb波EMAT 信噪比 空间分辨率
Keywords：Electromagneticultrasonictransducer Barkercodepulsecompression multi-elementLambwaveEMAT signal-to-noiseratio spatialresolution
机标分类号：TN722.75TN911.7TM151
在线出版日期：2024年4月29日
基金项目：国家自然科学基金，国家自然科学基金，国防基础科研计划，江西省主要学科与技术带头人培训计划，江西省主要学科与技术带头人培训计划，江西省杰出青年基金，江西省重点研发计划，江西省重点研发计划，南昌航空大学研究生创新专项资金资助项目基于Barker码脉冲压缩技术的钢板多阵元Lamb波电磁超声换能器设计与优化[
期刊论文] 电工技术学报--2024, 39(8)石文泽 李淇鑫 卢超 胡博 刘远为了解决传统Barker码脉冲压缩技术受脉冲功率放大器额定参数(占空比,最大脉冲宽度等)限制而导致的脉冲压缩效果下降、检测速度降低等问题,提出一种基于Barker码脉冲压缩技术的多阵元Lamb波电磁超声换能器(EMAT).建立了基...参考文献和引证文献
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基于Barker码脉冲压缩技术的钢板多阵元Lamb波电磁超声换能器设计与优化 Design and Optimization of Multi-Array Lamb Wave EMAT for Steel Plates Based on Barker Code Pulse Compression Technology
基于Barker码脉冲压缩技术的钢板多阵元Lamb波电磁超声换能器设计与优化.pdf
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