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外文原文Basedoninfraredalarmtechnologysecuritysystems1theintroduction1.1theresearchsignificanceofthistopicresearchsituationathomeandabroad.Withthedevelopmentofsocietyandscienceandtechnologyunceasingdevelopment,people'slivingstandardsbeenimprovedgreatly,andtotheprivatepropertyprotectionmeansintheunceasingenhancement,theintelligentfacilitiesforanti-theftputsforwardnewrequirements.Thisdesignistomeettheneedofmodernresidentialanti-theftdesignedfamilyelectronicalarmsystem.Itinpreviousdevicesbasedonimprovedgreatly,becauseusethesingle-chipprocessorsignal,notonlycanusedforsingleresidentialarea,alsocanbeusedinalarge-scaleresidentialsecuritysystems.It'sthejoboftheperformanceisgood,donotappeartoreportandmisstatementphenomenon,safeandreliable.Inourcountry,thepresentmarketconditionalarmbasicallyhastriggeredalarmsystempressureswitchelectronandalarmsystemandpressureshadingtriggeredalarmsystem,etc.Variouskindsofalarm,butthisseveralcommonalarmtherearesomeshortcomings.ThissystemUSESahumanpyroelectricinfraredsensorinthehumanbodydetectorintheflied,passivepyroelectricinfrareddetectorsbecauseofitslowcost,easyfabrication,lowcost,installationismoreconvenient,anti-theftperformanceisstableandhighsensitivity,safeandreliable,hasattractedbroadfamilycharacteristicssuchaspopularwiththecustomers.Andalarmsinstallationconcealment,noteasilybyroguefound.1.2infraredalarmtechnologyintroduction1.2.1natureobjectsoftheinfraredradiationThenatureofanyobject,aslongasthetemperatureaboveabsolutezero(273℃),constantlyoutwardissuedinfraredradiation,andtravelatthespeedoflightenergy.Objectradiateoutwardinfraredradiationofenergyandtheobjectoftemperatureandinfraredradiantwavelength.Assumingobjectslaunchinginfraredradiationofpeakwavelengthforafew,itstemperatureforT,theradiationenergyequalsinfraredradiationofpeakwavelengthgerbenandobjectproducttemperatureT.Thisproductisaconstant,namely:Thehigherthetemperatureoftheobjects,emitinfraredradiationofthesmallerpeakwavelength,sendoutinfraredradiationenergyisbiggeralso.1.2.2.pyroelectriceffectPassiveinfrareddetectoralsocalledpyroelectricinfrareddetector,itsmainworkingprincipleispyroelectriceffect.Pyroelectriceffectmeansifmakesomestrongdielectricmaterial(suchasqinbatio3,qinwrongacidleadP(zT),etc.)ofthesurfacetemperaturechanges,thenwiththetemperatureriseorfall,materialsurfaceoccurspolarization,namelyonthesurfaceofthechargewillbeproducedchange,andmaterialsurfacechargelostbalanceandeventuallychargewillchangewithvoltageorcurrentformoutput.1.2.3pyroelectricinfraredsensorbasicstructurePyroelectricinfraredsensorsfromsensordetectionyuan,interferencefiltersandmosfetverifierthreeparts.Accordingtothenumberofdetectingyuantopoints,pyroelectricinfraredsensorshaveunit,doubleyuanhefouryuantowaitforafewkinds,forhumandetectionofinfraredsensoradoptsdoubleyuanorfouryuantypestructure.Accordingtopyroelectricinfraredsensorutilitycent,havethefollowingkinds:usedformeasuringtemperaturesensor,it'sthejobofthewavelengthof(1-20)nano,Usedforflamedetectionsensor,it'sthejobofthewavelengthfor0.435+/-0.15nano,Forhumandetectionsensor,it'sthejobofthewavelengthof7to15feet.Figure1.2isadoubledetectionyuanpyroelectricinfraredsensorstructureschematicdrawing.Thesensorwilltwooppositepolarity,special1.2.4pyroelectricinfrareddetectorbasicprinciplePyroelectricinfraredsensorbyreceivingmobilehumanradiationthatcertainwavelengthsofinfraredradiation,canbetransformedintoandhumanbodymovementspeedanddistance,thedirectionoflow-frequencysignalsabout.Whenpyroelectricinfraredsensorbyirradiationsourcesofradiation,itsinternalsensitivematerialstemperatureswillrise,polarizationintensityisabate,surfacechargereduce,usuallywillreleasethispartofthechargecalledpyroelectriccharge.Becauseofpyroelectricchargehowmanycanreflectmaterialchangesoftemperature,sobypyroelectricchargebycircuittransformedintotheoutputvoltagecanalsoreflectmaterialchangesintemperature,thusdetectirradiationenergychanges.2hardwaresystemdesign2.1infraredanti-theftalarmsystemhardwaredesignBecausethisdesignfocusesonfamilyguardagainsttheft,real-timemonitoringofanarrowerrange,sothisdesignbysimplyusingapassiveinfrareddetectorisenough.Therefore,infraredintelligentanti-theftalarmsystem,andthespecificdesignrequirementsfor:(1)completestohighsensitiveinfraredsensordesign,makeitscanwarningofwhathappenedreal-timeandaccuratedetection.(2)automaticalarm(automaticdial-upalarmaudibleandvisualalarm).Wedesignthesystemmusthavethefollowingfunctionmodule:1.passiveinfrareddetector,2.sound-lightalarm,3.telephoneautomaticdial-upfunction;4.continueduninterruptedpowersupply,Accordingtothesystemtocompletefunctions,weadoptsinglechipmicrocomputerasthecoreofthesystemunit,electronicdetection,intelligentcontrolandtelephonetong2.2telephoneautomaticdial-upalarmcircuitdesignInordertosimplifythewholesystemdesignprocess,wedonotadoptMT880chipdialing.Realizationprocessisasfollows:Firstintelephonestorageinsideputondomestichostcellphonenumberoralarmcall110.FromMCUpinsp2.0andp2.1drawntwowiringconnectrelays,apicktelephonekeyboardMianDiJian,anotherconnecttelephonekeyboar