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Alarm detector



Synonymousintrusiondetectorsgenerallyrefertoalarmdetectors.

Principles

Alarmdetectorsselectdifferentsignalsensorsaccordingtodifferentpreventionplaces,andusedifferenttechnologiesofdifferentsensorstoautomaticallydetectoccurrencesinthedeploymentmonitoringareaInternalintrusionbehavior,thecorrespondingsignalistransmittedtothealarmhostofthealarmmonitoringcenter,andthehostdrivesthecorrespondingoutputdevicetoperformrelatedactionsaccordingtothepresetalarmstrategy.

Differentsignalsensorsareusedfordetection,andthedetectionandpredictionofdangeroussituationsarealsodifferent.Forexample,theinfraredsensorintheinfrareddetectorcandetecttherateofthermalchangeonthesurfaceoftheobjecttobemeasured,soastodeterminethemovementoftheobjecttobemeasuredandcauseanalarm;thevibrationsensorcandetectthevibrationoftheobjectandfixitonthegroundorasafe.Itcandetectthemovementoftheintruderwalkingorpryingthesafe.

Eachalarmdetectorhasacertainmeanstodetectthepresenceofintrudersinthefortifiedarea.Theidealalarmdetectoronlyrespondswhentheintruderappears,anddoesnotneedtopayattentiontoothers.,Theactivitiesofanimalssuchascats,dogsandmicewillnotrespond.Itisnoteasytoachievethis.Unpredictablechangesintheclimateandfieldconditionsinnature,suchastemperature,humidity,visibility,etc.,suchasthunder,rainandfog,mayaffectthedetectionresultsofsomedetectors.Therefore,theseunfavorablefactorsshouldbefullyconsideredintheselectionandinstallationlocationofthealarm.

Variousdetectorshavetheirowndifferentworkingprinciples,eachhasitsownadvantagesanddisadvantages,andthedetectionrangeisalsodifferent.Tomakethedetectorfunctioneffectivelyinanyoccasion,itshouldbecarefullyselectedandcarefullyinstalled.Wheninstalling,itshouldtakeintoaccountthedifferentsituationsofdifferentindustriesanddifferentunitsasmuchaspossible,sothespecificationsandparametersofthedetectorusedNotthesame.Inordertoachievethebestidealresults,itisnecessarytodoadetailedunderstandingandmeticulousinvestigationoftheactualsituationoftheuser,tominimizefalsealarms,andtomakethedetectorfunctionmoreeffectively.

Choose

Alarmdetectorsareusedassensordetectiondevicestodetectintruders’intrusionsandvariousabnormalsituations(suchasfireoccurrencesandequipmentabnormalities).Therefore,thealarmdetectoritselfisrequiredtohaveanti-dismantlingandanti-vandalfunctions.Whenthealarmdetectorisdamaged,itstransmissionlineisartificiallyshort-circuitedordisconnected,ortheprotectivecoverisillegallyattemptedtobeopened,itshouldbeabletogenerateanalarmsignaloutput.

Thealarmdetectorshouldhavecertainanti-interferencemeasures.Foralarmdetectorstopreventintrusionbehavior,theabilitytopreventexternalinterferenceisrequiredtopreventvariousfalsealarmsfromoccurring.Forexample,harassmentbypetsandsmallanimals;falsealarminterferenceduetochangesinenvironmentalconditions,etc.

Thesensitivityandreliabilityofalarmdetectorsinfluenceeachother.Reasonablyselectingthedetectionsensitivityofthealarmdetectorandadoptingdifferentanti-interferencemeasurescanimprovetheperformanceofthealarmdetector.Understandingtheperformanceandcharacteristicsofvariousalarmdetectors,accordingtodifferentapplications,areasonableconfigurationofalarmdetectorsisakeytodesignagoodintrusionalarmsystem.Inallkindsofintelligentbuildingsandordinarybuildings,therearemanyplacesthatneedsafetyprotection,andtheseplaceshavevarioussafetyprotectionpurposesandrequirementsaccordingtotheactualsituation.Therefore,reasonableselectionandinstallationofvariousalarmdetectorsaccordingtotheactualsiteenvironmentandsafetyprecautionrequirementscanbetterachievethepurposeofsafetyprecautions.Whentheselectionandinstallationofthealarmdetectorisnotappropriate,theremaybeloopholesinsecurityprecautions,whichcannotachievetherigorofsecurityprecautions,givingintrudersanopportunitytotakeadvantageof,andthusbringingunduelossestosecurityprecautions.

Classification

(1)Classificationbysensortype(detectedphysicalquantity)

Switchalarm,vibrationalarm,Ultrasonicalarms,infrasoundalarms,infraredalarms,microwavealarmsandvideoalarms,electricfieldalarmsandlaseralarms,etc.

Switchingdetectorsandmicrowave/passiveinfrareddualtechnologydetectorshavebeenincludedinthemandatoryproductcatalog.

(2)Classificationaccordingtotheworkingmodeofthedetector

Therearetwotypesofactivedetectionalarmsandpassivedetectionalarms.

1.Activedetector

Whenworking,thetransmitterinthedetectoremitssomeformofenergytotheguardsite,formingastableandchangingsignaldistributiononthereceivingsensor.Onceadangeroussituationoccurs,thestableandchangingsignalisdestroyed,formingadetectionsignalwithalarminformation,andanalarmsignalisgeneratedafterprocessing.Thesensorsinthistypeofdetectorincludetransmittingandreceiving,suchasultrasonicdetectors;therearealsotransmittersandreceiversintwodifferenthousings,suchasactiveinfrareddetectors,laserdetectors,andsoon.

2.Passivedetector

Whenworking,thedetectoritselfdoesnotemitenergytotheguardsite(excludingtheradiationenergyofthecircuit),butreliesonreceivingnaturalenergytoformastableandchangingsignalonthedetector’sreceivingsensor.Whenadangeroussituationoccurs,thestableandchangingsignalisdestroyed,formingadetectionsignalwithalarminformation,whichisprocessedtoproduceanalarmsignal,suchaspassiveinfrareddetectors,vibrationdetectors,etc.

(3)Classificationaccordingtothedetectionelectricsignaltransmissionchannel

Wiredalarmandwirelessalarm.Thewireddetectorisconnectedbetweenthedetectorandthealarmcontroller;thewirelessdetectoristhewirelessdetectorthatusesradiowavestotransmitthealarmsignal.

(4)Classifiedaccordingtoalarmrange

Pointcontroldetector,linecontroldetector,surfacecontroldetectorandspacecontroldetector.

1.Point-controlleddetectors

Thealertrangecanberegardedasapoint.Whenthealertstateofthispointisdestroyed,itwillsendoutanalarmsignal,suchasamagneticswitchdetector.

2.Line-controlleddetector

Thealertrangeisaline.Whenthealertstateofthislineisdestroyed,itwillsendoutanalarmsignal,suchasactiveinfrareddetectors,laserdetectors.

3.Surface-controlleddetectors

Thewarningrangeisonesurface.Whenthewarningstateofanypointonthewarningsurfaceisdestroyed,itwillsendoutanalarmsignal,suchasvibrationdetectors,soundcontrol/vibrationglassbreakdetectors.

4.SpaceControlledDetector

Itswarningrangeisaspace.Whenthewarningstateofanyplaceinthisspaceisdestroyed,itwillsendoutanalarmsignal,suchaspassiveinfrareddetectors,microwavedetectors,ultrasonicDetector,videodetector,microwave/passiveinfrareddualtechnologydetector.

(5)Classificationbyapplication

Accordingtotheapplication,itcanbedividedintooutdooralarm(peripheralandperimeter)andindooralarm.Applicationoccasionscanalsobeperimeter,showcase,fireprevention,anti-theft,vault,etc.Asfarasthesametypeofdetectorisconcerned,thetechnicalindicatorsusedoutdoorsaremuchhigherthanindoorones,becausetheoutdoorenvironmentalconditionsaremuchharsher.Forexample:theapplicabletemperaturerangeofanoutdooractiveinfrareddetectorproducedbyacertainfactoryis-25℃-+70℃;theapplicabletemperaturerangeofanindooractiveinfraredalarmis-10℃~+55℃.

(6)Differentclassificationaccordingtotheswitchsignaloutputbythedetector

1.Normallyopen(NO)detector

Undernormalcircumstances,theswitchisopen;whenthedetectoristriggered,theswitchisclosedandtheloopresistanceiszero,andthezonealarms.

2.Normallyclosed(NC)detector

Undernormalcircumstances,theswitchisclosed;whenthedetectoristriggered,theswitchisopenedandtheloopresistanceisinfinite,andthezonealarms.

3.Normallyopen/normallycloseddetector

Thistypeofdetectorhastwoinputmodes:normallyopenandnormallyclosed.Itisnecessarytohavebothanormallyopenoutputpointandanormallyclosedoutputpointontheterminalboard.

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