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ID:22946813
大小:64.68 KB
页数:16页
时间:2018-11-02
《外文翻译---数据采集:简介》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、附录A英文文献原文DataAcquisition:AnIntroductionBruxtonCorporationThisisaninformalintroductiondigitaldataacquisitionhardware.ItisprimarilydirectedtowardsassistingintheselectionofappropriatehardwareforrecordingwiththeAcquireprogram.OverviewInprinciple,dataacquisitionhardwarei
2、squitesimple.AnA/Dconverterdeliversasequenceofvaluesrepresentingananalogsignaltoanacquisitionprogram.Inpractice,selectingandproperlyusingdataacquisitionhardwareismorecomplex.Thisdocumentprovidesaninformalintroductiontothetopic..Manyoftheexamplesaretakenfrompatch-cla
3、mprecording.Thistechniquerequiresaccurateacquisitionoflow-levelsignals(picoamperes)withbandwidthintheaudiorange(upto10kHz).BackgroundAdataacquisitionsystemconvertsasignalderivedfromasensorintoasequenceofdigitalvalues.Thesensorisconnectedtoanamplifier,whichconvertsth
4、esignalintoapotential.Theamplifierisinturnconnectedtoadigitizer,whichcontainsanA/Dconverter.Thedigitizerproducesasequenceofvaluesrepresentingthesignal.SignalSourceThesourceofmostsignalstobedigitizedisasensor,connectedtoanamplifierwithappropriatesignalconditioning.Th
5、eamplifierdeliversanelectricalsignal.ThissignalisthendigitizedusinganA/Dconverter.Forpatch-clamprecording,thesensorsaresolutionfilledpipettes.Thepipetteisconnectedtoapatch-clampamplifierthatconvertsthevoltageatthepipetteorthecurrentthroughthepipettetoahigh-levelsign
6、al.Byconvention,thefull-scaleoutputrangeofapatch-clampamplifieris±10V,matchingtherangeofcommoninstrumentationqualitydigitizers.DigitizerAdigitizerconvertsoneormorechannelsofanalogsignaltoasequenceofcorrespondingdigitalvalues.TheheartofadigitizerisanA/Dconverter,adev
7、icethatsamplesananalogsignalandconvertsthesampletoadigitalvalue.Forexample,forrecordingfromasingleionchannel,thedigitizermightdeterminetheoutputofthepatchclampamplifieronceevery50msandprovidetheresultingvaluetothecomputer.SamplingTheoremThepurposeofdataacquisitionis
8、toanalyzeananalogsignalindigitalform.Forthistobepossible,thesequenceofvaluesproducedbyadigitizermustrepresenttheoriginalanalogsignal.Thesa
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