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1、AANDERAAINSTRUMENTSDATACOLLECTINGINSTRUMENTSFORLANDSEAANDAIRMIRAVISIBILITYSENSOR3544.(Forwardscattering)AcompactandruggedvisibilitysensordesignedforusewithAanderaaWeatherStations,RoadWeatherStationsandEnvironmentalMonitoringSystems.Visibilityintheatmosphereisofgreatinterestforr
2、oadandphotocellthusgivingasignalwithgoodcorrelationtotheseatrafficandinaviation.TheMIRAVisibilitySensor3544visibilityintheambientair.Thephotocurrentwhichisisdesignedtofulfillthedemandforasmall,lowpowerunitproportionaltothescatteredlight,isamplified,averaged,tobeoperatedwithAand
3、eraaMeasuringStations.Visibilityconvertedtovisibilityandstoredinthesensorasa10bitisoftenlimitedbyfogandhazeandthesensorisdesigneddigitalsignalreadytobereadbytheSensorScanningUnittodetectthesefactors.orDatalogger.ThesensorconsistofanaluminumbodycontainingallIfthesensorispoweredf
4、romMains,fastsamplingmodenecessarysolidstateelectronicsandtwoverticallegs.ItiscanbeusedtoincreasethenumberofsamplestakeninafurnishedwithastandardAanderaameteorologicalsensormeasurementcycle.Thiswillimprovetheaccuracyofthefoot.Itisarugged,watertight,corrosionfreeandsolidstatesen
5、sor.Inthismodethelightbeamistransmittedevery6sensorwithminimummaintenancerequirements.Inonelegseconds.ofthebody,aninfrared(IR)lightemittingdiodeisinstalledToavoidfalsescatteringfromsurroundingobjects,theatanangleof25degrees.TheoppositelegcontainsanIRsensormusthavefreehorizontal
6、distanceofatleast15cmphotodetector.Thediodeandthephoto-detectorareandafreeverticaldistanceofmorethan1meters.Thisisprotectedagainstcloggingbyacover.takenintoconsiderationwheninstallingthesensorontheThesensorhastwooperatingmodes,NormalandFastsensorarmofaRoadWeatherStation4030orAu
7、tomaticsamplingModes,whichcanbeselectedbytheModeWeatherStation2700.Switch.InNormalMode,usedwhenthesensorissolar-cellFordirectconnectiontoaProgrammableLogicorbatterypowered,thesensortransmitsaninfraredlightControllerPLC,aSignalConverter,partno.3429isbeameveryminute.Iffogorhazear
8、epresent,forwardavailablewhichwillconvertthedatato0-5V
