数据采集基础英汉对照.ppt

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1、BasicsofDataAcquisition数据采集基础Typicaldataacquisitionapplications数据采集典型应用Physiologicalstudies（生理学研究）Environmentalstudies(temperature,etc.)（环境研究）Materialstesting（材料试验）Medicalresearch（医学研究）Qualitycontrolandtesting（质量控制与试验）Typicaldataacquisitionapplications数据采集典型应用Strain,pressure,temperatureandvibrationa

2、nalysis（应力、压力、温度、振动分析）Fluidanalysis（流体分析）Manufacturingautomation（制造自动化）Componentsofadataacquisitionsystems数据采集系统的组成Analogtodigitalconversion(A/D)模数转换器Digitaltoanalogconversion(D/A)数模转换器Digitalinput/output(DIO)数字输入/输出Pacerclock同步时钟AnalogtoDigitalConversion(A/D)模数转换器Oncedatahasbeenconvertedfromanalogt

3、odigital,thedigitalinformationcanthenbeprocessedbythecomputer,ortransferredtomemory将模拟信号转换成数字信号以便被计算机进一步处理或传送到内存中DigitaltoAnalogConversion(D/A)D/Aconvertersconvertstoreddatabacktoacontinuoussignal(analogvoltage)fordisplayorcontrolpurposes（数模转换器用于将存储的信号再变成模拟电压，以供显示和控制）OutputfromtheD/Aconvertercanbeus

4、edtodriveexternaldeviceswhichrequireananaloginput（模数转换器的输出可用于需要模拟输入的外部设备的驱动）DigitalInput/Output(DIO)数字输入/输出Usedprimarilyforcontrolpurposes用于控制Usedtotransmitdatabetweenthehostprocessorandanexternaldigitaldevicethatexpectstoreceive1’sand0’s处理器和外部数字设备之间的数据传递PacerClock同步时钟Usedtoinitiaterepetitivedatacon

5、versions重复数据变换的初始化Usedtocontrolthesamplingrateofconversions采样率的控制Whatisanalog?何谓模拟量Analogsignalsare“continuous”signals模拟信号是“连续”信号Representedbycontinuouslychangingphysicalquantities用连续变化的物理量来表示Levelofsignalcanbeincreasedordecreasedindefinitely信号的大小可以无限增加或减小Ex.temperature,pressure,strain,voltage如，温度、压

6、力、应力、电压Whatisdigital?何谓数字量Digitalsignalsare“discrete”signals数字信号是“离散”信号Representedbyseparate,individualunits“bits”(binarydigit)用分离、独立的单位，比特表示Bitsarerepresentedbyoneoftwopossiblestates:on/off,true/false,1/0比特代表两种量：开/关，真/假，1/0Whatisdataacquisition?何谓数据采集Amethodofacquiringananalogsignalandconverting(di

7、gitizing)itintoabinarycodewhichcanbemanipulatedbyacomputer是一种获取模拟信号并将其转换成二进制代码的一种方法。通过计算机来实现ComputerAnalogSignalAnalysisA/DInterface模数转换接口Convertsanalogdataintodigitaldatawhichcanbeprocessed（将模拟信号变换为数