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基于EMI硬化放大器的脑电信号采集系统.docx

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基于EMI硬化放大器的脑电信号采集系统 Abstract： Thecollectionofelectroencephalograms(EEGs)isimportantforawiderangeofmedicalapplications,includingthestudyofbrainfunction,thediagnosisofneurologicaldisorders,andthemonitoringoftheeffectsofanesthesia.However,inordertoobtainmeaningfulEEGsignals,itisnecessarytominimizetheamountofelectromagneticinterference(EMI)fromexternalsources.Inthispaper,wepresentanovelEEGsignalcollectionsystembasedonEMI-hardenedamplifiers.Thesystemusesacombinationofshielding,filtering,andsignalprocessingtechniquestoreducenoiseandimprovesignalquality.WepresentexperimentalresultsdemonstratingtheeffectivenessofoursystemincollectingaccurateandreliableEEGsignalseveninthepresenceofstrongEMI. Introduction： Theelectroencephalogram(EEG)isawell-establishedtechniqueformeasuringelectricalactivityinthebrain.Itiswidelyusedinmedicalresearch,diagnostics,andmonitoringofbrainfunction.However,thecollectionofEEGsignalsissubjecttoavarietyofnoisesources,includingelectromagneticinterference(EMI)fromexternalsources.InordertoobtainmeaningfulEEGsignals,itisnecessarytominimizethesenoisesources.Inthispaper,wepresentanovelEEGsignalcollectionsystembasedonEMI-hardenedamplifiers.Thesystemusesacombinationofshielding,filtering,andsignalprocessingtechniquestoreducenoiseandimprovesignalquality. EMI-HardenedAmplifiers： ThefirststepindevelopingourEEGsignalcollectionsystemwastodesignEMI-hardenedamplifiers.Wechosetousedifferentialamplifiers,whicharecommonlyusedinbiomedicalsystemsfortheirabilitytorejectcommon-modenoise.Thedifferentialamplifiersweredesignedtohavehighcommon-moderejectionratio(CMRR)andlowinputimpedancetoreducetheeffectsofcablecapacitance.Theamplifierswerealsodesignedtohavehighinputimpedancetominimizeloadingeffectsontheelectrodes. Shielding： ThenextstepwastodevelopashieldingsystemtoreduceEMIfromexternalsources.Weusedacombinationofshieldingtechniques,includingshieldingoftheamplifiercircuitboardandcables,grounding,andusingshieldedtwistedpairsforelectrodeleads.Theamplifiercircuitboardwasenclosedinam