可燃性气体检测与报警系统的外文翻译

数学与学院本科毕业论文(设计)外文文献翻译译文题目：Designofdetectionofcombustiblegasandalarmsystem学生姓名：洪豪专业：数学与应用数学和电气工程及其自动化指导教师：倪浩2013年2月湖北科技学院本科毕业论文（设计）：外文翻译第1页原文：DesignofCombustibleGasDetectionsystemusingWirelessTransmissionTechnologyShijiazhuangUniversitiesofEconomics,Hebei,[e-mail]:TGS813,AT89S52,DS18B20,nRF905,TC35iAbstract.Thedetectiondeviceofcombustiblegasaredesignedinthepresentedwork,usingwirelesstransceiverandGSMnetwork.Thesystemrealizethewirelesstransmissionofthegasconcentration,andalsocansendalarminformationtouser’smobilewhenanexceptionoccurs.Thesystemconsistsoftwoparts:amasterandslave.Thefunctionoftheslaveistocollectdata,processdataandtransfferthedatatothemaster.ThetaskofthemasteristoreceivedataanddisplayitbyLED.ThesignalacquisitioniscompletedbysensorTGS813andA/DconverterTLC2543.ThewirelesstransmissionisachievedthroughwirelesstransceivernRF905.Sincetheaccuracyofthesensorisaffectedbytheenvironment,usingDS18B20toachievetemperaturecompensation.AndwithwirelesscommunicationmoduleTC35iandGSMnetworkplatform,wecansendthealarminformationtouser’smobilepromptly.IntroductionGasdetectioniswidelyusedinpetroleum,chemical,metallurgy,family,shoppingmalls,gasstationsandotherplaces.Currently,howtomonitorthehazardousgasfastandaccuratelyaretheimportantissues.Althoughthegasdetectiontechnologyisrelativelymature,butmostproductshasmanyshortcomings,suchassinglefunction,operatingcomplex,bulky,expensiveandlowsensitivity.Wirelesscommunicationtechnologyappliedtothegasmonitoringfield,canresolvetheproblemofremotemonitoringinspecialenvironment,suchashightemperature,lowtemperature,toxicgas.andunabletowiring.Inthepresentedwork,thecombustiblegasdetectorisfullyfunctional(withwirelesstransceiver),simple,smallsize,lowcost,andhashighsensitivity.Theequipmentcangreatlyimprovethesystem'sdetectioncapabilityandaccuracywithtemperaturecompensationalgorithm,andalsocansendalarminformationtotheuser'smobilephonepromptlythroughtheGSMnetwork.SystemdesignThesystemconsistsoftwopartsasshowninFigure1.Fig.1Overallsystemblockdiagram湖北科技学院本科毕业论文（设计）：外文翻译第2页Theslavepartmainlycompletedatacollectionandwirelesstransmission.Themasterpartmainlycompletereceivingdata,displayingandsendingalarmmessage.Thesignalofgasconcentrationiscollectedbycombustiblegassensorwhichgeneratesaweakelectricalsignal.Thesignalcanbeamplifiedandstabilizedbyconditioningcircuit.AndthenA/Dcircuitconvertstheanalogsignaltodigitalsignalwhichmicrocontrollercanprocess.Inordertoimprovethemeasurementaccuracy,andreducetheimpactoftemperature,designatemperaturecompensationcircuittocollecttempreturedata.AT89S52processthecollecteddataandsenddatatothemasterbywirelesstransceiver.ThemasterreceivesthedataanddisplaysitbyLED.Andifthegasconcentrationbeingabnormal,thesystemwilldrivespeakerforanalarmsignalanduseTC35imoduletosendalarminformationtouser’smobile.HardwaredesignSignalacquisitionandconditioningcircuit.Figure2showsdataacquisitioncircuit.TGS813isaGassensingresistivesensor.TheconductivityofTGS813isinfluencedbytheconcentrationofcombustiblegasesinair,thegreatertheconcentration,thehigherconductivity.InsystemR0,R9,R10andRS(inTGS813)formabridgecircuittoconvertresistancetovoltagesignal.OperationalamplifierAconnectedasavoltagefollowerwithresistorsR7andregulatorD1makeupthevoltageregulatorcircuittosupplypowerforthebridge.InordertothevoltageadapttotheA/Dconverter,thevoltageisamplifiedbyopampB,andthemagnificationcanbeadjustedthroughresistorR11.Fig.2GasconcentrationsignalacquisitioncircuitFig.3Temperaturecompensationcircuit湖北科技学院本科毕业论文（设计）：外文翻译第3页Temperaturecompensationcircuit.TheresistanceofRsisgreatlyaffectedbytemperature.Inordertoimprovesystemaccuracy,theresultsmustbetemperaturecompensatedortemperaturecorrection.Insystem,usingtemperaturesensorDS1820tocollecttemperaturesignal,andusingsoftwaremethodfortemperaturecorrection.Wirelesstransmissionmodule.Wirelesstransceiverisachievedbyasingle-chipRFtransceivernRF905.MCUandnRF905realizedataandcommandsinteractionthroughtheSPIinterface.ThetypicalapplicationschematicisshowninFigure4.Theantennapartis50Ωsingle-endedantenna.Thecommunicationfrequencyis433MHz,andoperatingvoltageis3.3V.Thevalueofresistors,capacitorsandinductorisdeterminedbythedatasheetofnRF905.GSMshortmessageunit.TheinterfacecircuitofTC35iandMCUisshowninFigure5.ThecommunicationbetweenMCUandTC35iisviaserial,andtherateis9600bps.Communicationsmodeis8-bitasynchronouswithastartbit,8databits,and1stopbit.ButtheserialinputofTC35irequiresCMOSlevel,andserialoutputof89C52requiresTTLlevel.Inordertoachievethevoltageconversionthesystemusethewayofresistorssharingvoltage.Fig.4nRF905ApplicationSchematicFig.5TC35iandMCUinterfacecircuit湖北科技学院本科毕业论文（设计）：外文翻译第4页SoftwareDesignThesoftwaresystemincludesdataacquisitionmodule,temperaturecompensationmodule,andwirelesstransceivermoduleWirelesssendingprogram.NRF905datasendingprocessisasfollows:1)Whenhavingdatatosend,themicrocontrollersendthereceiver'saddressandthedatatonRF905chronologicallybytheSPIinterface.ThenplacedthedatatobetransmittedintoTxBufregister,sendWTPcommandtowritethedatatoTX-Payloa