用于流量測量的網(wǎng)絡(luò)傳感器的研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文用于流量測量的網(wǎng)絡(luò)傳感器的研究姓名：王笑申請學(xué)位級(jí)別：碩士專業(yè)：測試計(jì)量技術(shù)及儀器指導(dǎo)教師：陳仁文20070101南京航空航天大學(xué)碩士學(xué)位論文iiABSTRACTInthetrendofintellectualizationinfmationalizationwklizationoftheinstrumentsinvariousfieldsthetraditionalflowmetercurrentflowt

2、otalizerarerequiredtoimprovetheprecisionenlargeusingareawhichcanachievethegoalofremotemeasurementinfmationsharing.SuchbusesasHARTCANRS485aremostlyadoptedtofmameasurementwkinthetraditionalflowmeters.Butithassomedisadvanta

3、gesthattheyemploydifferentprotocolssuchthattheycan’tbeconfiguredunifmly.Furthermetheirtransmissiondistanceexpansibilitytransmissionrateetc.arelimited.WiththedevelopmentofEtherawkedflowmeasurementsystembasedonTCPIPprotoco

4、lispresentinthepaper.Thisistoenableaclientbyastardwkprotocoltohaveonlineflowmeasurementthecapabilitiesofdatamonitingcontrolwiththecombinedtechnologiesofflowtotalizingwk.Thesystemisofmodularstructureusesasinglechipmicroco

5、mputerasitscontroller.Ftheflowmeasurementsenssshouldbechosenatfirstthenthetransductioncircuitsaredesignedtotransfmthedifferentialpressurewhichisthemainvariabletheabsolutepressurethetemperatureintothevoltagesignalsafterth

6、atthevoltagesignalsareconvertedtodigitalsignalsbytheADconvertsunderthecontroloftheMCU.TheMCUalsoprocessesthesedigitalsignalscumulatetheflowquantitiesmakessoftwarecompensationLCDdisplay.BesidestheMCUcanupdatethealgithmsof

7、dataprocessing.FwkdatatransmissiontheMCUcontrolstheoperationofthehardwareprotocolstackchipconnecttoEtherwithanEtherPHYchip.TheMCUmonitstheptwaitsfconnectionwiththeclientwilltransmitrequireddatatotheclientaccdingtotheclie

8、ntinstructionswhentheconnectionsucceeds.ThegoalofthesystemistomakeanintelligentflowmeterasawknodetocommunicatewithacomputerwkwithTCPIPprotocol.Thetransmissionratetransmissiondistancemeasuringprecisionhavebeenimprovedinth