热释电人体红外线传感器的基本结构和原理外文翻译.docx

热释电人体红外线传感器的基本结构和原理外文翻译.docx

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热释电人体红外线传感器的基本结构和原理外文翻译

TheprincipleandapplicationofPyroelectricinfraredsensor

ByJohn.Chur

Pyroelectricinfraredsensorbody（hereinafterreferredto:

sensor）fromsensitiveunits,impedanceconverterandfilterwindowofthethreemajorcomponents.

1、Sensitiveunit

Thedifferentsensors,sensitiveelementofthematerialisdifferent.IfSD02sensitiveunitsmadebythePZT;P2288fromLiTaO3made.Thesematerialstomakethinsheet,eachoneofthetwosidesoftherelativelythinleadanelectrode,theelectrodesatbothendsoftheformationoftheequivalentofasmallcapacitor.Becausethesetwosmallcapacitorisdoneinthesamesiliconchip.

Andtheyformtheequivalentofsmallcapacitorcanhaveitsownpolarization,thepolarizationoftheresult,thetwoendsofacapacitorintheoppositepolarityofthepositiveandnegativecharge.Butthecapacitoristhepolaroppositeoftheseries.Thisistheuniquedesignofthesensor,thusmakingitauniqueandanti-jamming.

Whenthesensordetectsnoradiationfromthebodyoftheinfraredsignal,asP1,P2haveitsownpolarization,thetwoendsofacapacitorintheoppositepolarity,istheequivalentofelectricity,negativecharge,whichthetwocapacitoristheoppositepolarityTheseries,therefore,positiveandnegativechargetooffseteachother,notintheloopcurrent,asensoroutput.

Whenthehumanbodysensorsdetectstaticintheregion,exposuretotheP1,P2ontheinfraredlightenergyequivalent,andachieveabalanced,polaropposite,theenergyequivalentoflightintheloopcurrentoffseteachother.Sensorsarestillnosignaloutput.Similarly,inthelightorthesun,becausethespeedofthesunmovingveryslowly,P1,P2ontheinfraredlightenergycanstillbeseenasequalandoffsettingeachotherintheloop.

Coupledwiththelowfrequencyresponseofthesensor（normally0.1~10Hz）,thatis,infraredsensorsonthewavelengthoflight-sensitiveaverynarrowrange（typically5~15um）,therefore,thesensorisnotsensitivetothem.

Whenthetemperaturechangecausedthetemperaturesensoritselfchanges,duetoP1,P2dothesamesiliconchip,ithastheoppositepolarity,andtheenergyequivalentoflightinthestillcurrentintheloopoffseteachother,nosensoroutput.

Fromtheprinciplesofperspective,anybodywillhaveaninfra-redfever,pyroelectricinfraredsensorsonthebodyofthesensitivityofthemaininfraredsensorssensitiveperformanceoftheunitbythechangesintemperature,andtemperaturechangesleadtotheformationofelectricalsignals.Environmentandthetemperaturechangefromitsowninternalstructureofitsdecisionnotoutwardoutputsignal.

Thelow-frequencyresponseofthesensor（normally0.1~10Hz）andthespecificwavelengthinfrared（normally5~15um）ofthesensorresponsetoadecisiononlyontheoutsideoftheinfraredradiationcausedbychangesintemperaturesensorsandsensitive,andthischangeIntermsofthehumanbodyismoving.Therefore,thesensoronhumanmovementorthemovementofsensitive,stationaryormovingveryslowlyinthehumanbodyisnotsensitiveitcanbemostvisibleandinfraredanti-interference.

2、Filterwindow

Itisathinglasscoatingonthemulti-layerfilmfromthefilter,filterwindowcaneffectivelyfilterout7.0~14umoutsidetheinfraredwavelengths.Forexample,SCA02-1,7.5~14umwavelengthinfraredpenetrationof70%,6.5umDepartment,droppedto65percent,whilein5.0um,whendecreaseto0.1%;P2288responsetothewavelengthof6~14um,thecenterwavelengthof10um.

Launchingobjectstoinfraredradiation,thewavelengthofthestrongestandtherelationshipbetweentemperaturemeet

Whichwasthelargestwavelength,Tisabsolutetemperature.Thebody'snormalbodytemperatureisfrom36to37.5

thatis,309～310.5K,itsmostpowerfulinfraredradiationofwavelength

Thecenterwavelengthis9.65um.

Therefore,thebodyofthestrongestinfraredradiationatwavelengthsjustlandedfilterwindowresponsewavelength（7~14um）atthecentre.Therefore,thefiltercaneffectivelywindowtothehumanbodythroughinfraredradiation,andthemaximumtostopthesun,lightingandsovisibleintheinfraredthrough,soastoavoidinterference.

Tosumup,onlytomobilesensorsormovementofthehumanbodyandthebodytemperatureofobjectssimilartothehumanbodyworks.

FresnellenswhennotinuseFresnellenssensordetectionradiusoflessthan2meters,withonlytheuseofFresnellenscanbemostuseful.WithFresnellenswhensensorsdetectaradiusofupto10meters.Forexample,somesensorsinthe20metersfarfromthefastmovingcarinthehumanbodycanbereliablydetected.Fresnellensproducedbyaplasticplate.

Thelensmeasuredinthehorizontaldirectionintothreeparts,eachpartinaverticaldirectionanddividedintoanumberofdifferentregions.ThetoppartofeachDenfenasalensunit,theyconstitutefromoneconcentriccircles,concentriccirclesinthecenterofthelensunit.MiddleandthelowerportionofeachDenfenforalensunit,respectively,fromthesameformconcentriccircles,butthecenterofconcentriccirclesisnotwithinthelensunit.

Whenthelightthroughthelensoftheseunits,willbeadark-andvisibleareasandblindspots.Sinceeachelementofalensonlyasmallangle,fortheforeseeableperspective,theperspectivefortheblindspot.Anytwoadjacentlensunitsareinablindspotbetweenthatareaandspacingoftheirintermittentwithoutduplicationandoverlapping.Inthisway,whenthelensonthefrontofthesensorisanappropriatelocation,movementintheeventofahumanbodyinfrontofthelens.

Infra-redradiationtothehumanbodythroughthelensinthesensorontheformationoftheturnofthechangesintheshadowof（blindspots）andbright（that）,sothatthesurfacetemperaturesensorsconstantlychanging,sotheoutputsignal.Thiscanalsounderstandthathumanactivitiesintheregiondetection,leavingafieldofviewlensunit,willimmediatelyenteranotherfieldofviewlensunit.

Becauseneighboringcloseintervalsbetweenthelensunit）,withasensoronthebodyoftheblindspotofmobileandvisible,leadingtochangesintemperaturesensor,andoutputsignals.Fresnellensthatcannotonlycreatezonesandblindspots,focusing,itsfocusisgenerallyaboutfivecentimeters,theactualapplication,shouldbebasedontheactualsituationorinformationprovidedtoadjustFresnellensandthedistancebetweensensors,Thegeneralsensorinthelensfixedinfrontof1to5cminplaces.

ThegeneralFresnellensmadeofpolyethyleneplasticfilm,forthecolorofmilkywhiteorblack,withatranslucent,butthewavelengthoftheinfraredaround10um,itistransparent.

Thepyroelectricinfraredsensor'sbasichumanapplication

PY1sensorfortheP2288orSCA02-1,IC1forlow-noiseamplifierLM358,suchashigh-speedcomputing.PY1detectedbytheinfraredsignalthehumanbody,from2feetoutoftheextremelyweaksignalswiththedirectinputoftheamplifierIC1areleaseabout2,500times,from1footacertainlevelofoutputsignal,andthentothecapacitivecouplingC8RP-amplifierIC1bfurtheramplification.IC2awindow-typevoltagecomparators,whenIC1bvoltagerangeof7feetinUaandtheamplitudebetweentheUb,IC2feetwithoutoutputof1、7pin.

 WhenIC1bthemagnitudegreaterthan7feetvoltageamplitudeattheUb,IC27feethigh-outputwhenIC1boflessthan7feetvoltageamplitudeattheUa,IC2feetofahigh-output,theD1,D2mutualisolationand"or"theroleofpointoutputfromthePHIGHcontrolsignals.R11tosetthethresholdlevelwindow,adjustR11canadjustthesensitivityofdetectors.Phigh-pointoutputcontrolsignalscanbeusedforavarietyofpracticalcircuits.

1、"Haveelectricityanddangerous"securityalertforanelectriccircuitoftheoccasion,whensomeoneaccesstotheseoccasions,throughtheissueofvoiceandsound-todrawattentiontosafety.

2、Automaticdoorsformajorbanks,guesthouses.Whenpeoplecametowhenthedooropensautomatically,peopletoleaveandthenshutdownautomatically.

3、Infra-redanti-theftalarmsystemforbanks,officebuildings,familyoccasions,suchastheanti-theftalarm.

4、Highwayvehicletrafficcounters

5、Automaticallyopened,theCommissionerofthelights,closetothebodyautomaticallyswitches,etc.

Theprincipleandapplicationofpassiveinfrareddetector

Intheelectronicanti-theft,inthefieldofhumandetectors,passivepyroelectricinfrareddetectoriswidelyusedbecauseoftheirlowprice,technicalperformanceandstabilitybythevastnumberofusersandprofessionalswelcome.

Passivepyroelectricinfraredprobetheworkingprincipleandcharacteristics:

Innature,anymorethanabsolutetemperature（-273degrees）whentheobjectswillhaveinfraredspectrum,theobjectsatdifferenttemperatures,thereleaseofthewavelengthofinfraredenergyisnotthesameas,infraredwavelengthsandthelevelisrelatedtotemperature.

Inapassiveinfrareddetectorhastwokeycomponents,isapyroelectricinfraredsensors（PIR）,itwillbeat8fora12umbetweentheinfraredsignalchangesintoelectricalsignals,andcanNatureofthewhitesignalinhibited,passiveinfrareddetectorinthesecurityarea,whennohumanmovement,thepyroelectricsensorinfraredsensorstothebackgroundtemperatureisonlywhenthehumanbodyintothewarningarea,

ThroughtheFresnellens,pyroelectricinfraredsensortosensoristhehumanbodytemperatureandthetemperaturedifferencesinbackgroundsignals,sotheinfraredsensorsdetecttheinfraredsensorsisthebasicconceptofmovingobjectsandbackgrounddifferencesinthetemperatureoftheobject.