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ID:9889880
大小:65.42 KB
页数:16页
时间:2018-05-14
《外文翻译---数据采集:简介》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、附录A英文文献原文DataAcquisition:AnIntroductionBruxtonCorporationThisisaninformalintroductiondigitaldataacquisitionhardware.ItisprimarilydirectedtowardsassistingintheselectionofappropriatehardwareforrecordingwiththeAcquireprogram.OverviewInprinciple,dataacquisitionhardw
2、areisquitesimple.AnA/Dconverterdeliversasequenceofvaluesrepresentingananalogsignaltoanacquisitionprogram.Inpractice,selectingandproperlyusingdataacquisitionhardwareismorecomplex.Thisdocumentprovidesaninformalintroductiontothetopic..Manyoftheexamplesaretakenfromp
3、atch-clamprecording.Thistechniquerequiresaccurateacquisitionoflow-levelsignals(picoamperes)withbandwidthintheaudiorange(upto10kHz).BackgroundAdataacquisitionsystemconvertsasignalderivedfromasensorintoasequenceofdigitalvalues.Thesensorisconnectedtoanamplifier,whi
4、chconvertsthesignalintoapotential.Theamplifierisinturnconnectedtoadigitizer,whichcontainsanA/Dconverter.Thedigitizerproducesasequenceofvaluesrepresentingthesignal.SignalSourceThesourceofmostsignalstobedigitizedisasensor,connectedtoanamplifierwithappropriatesigna
5、lconditioning.Theamplifierdeliversanelectricalsignal.ThissignalisthendigitizedusinganA/Dconverter.Forpatch-clamprecording,thesensorsaresolutionfilledpipettes.Thepipetteisconnectedtoapatch-clampamplifierthatconvertsthevoltageatthepipetteorthecurrentthroughthepipe
6、ttetoahigh-levelsignal.Byconvention,thefull-scaleoutputrangeofapatch-clampamplifieris±10V,matchingtherangeofcommoninstrumentationqualitydigitizers.DigitizerAdigitizerconvertsoneormorechannelsofanalogsignaltoasequenceofcorrespondingdigitalvalues.Theheartofadigiti
7、zerisanA/Dconverter,adevicethatsamplesananalogsignalandconvertsthesampletoadigitalvalue.Forexample,forrecordingfromasingleionchannel,thedigitizermightdeterminetheoutputofthepatchclampamplifieronceevery50msandprovidetheresultingvaluetothecomputer.SamplingTheoremT
8、hepurposeofdataacquisitionistoanalyzeananalogsignalindigitalform.Forthistobepossible,thesequenceofvaluesproducedbyadigitizermustrepresenttheoriginalanalogsignal.Thesa
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