w w w . l u m e x . c o m 7 0 7 . 3 0 3 . 3 8 3 7 MicronSensIR™ Infrared Emitter and Detectors New Technology Provides Industry-Leading Sensitivity, Reliability and Durabilty In the detection and identification of gases in the 1.0 to 5.5 µm infrared region, PbS and PbSe detectors provide unparal- leled sensitivity versus cost. In addition to their best-in-class performance statistics, Lumex’s new MicronSensIR family of infrared emitter and detector products are ideal for a wide range of applications. Features: • Industry-leading sensitivity of 1.5E10 Jones across the 1 to 5.5 micron infrared spectrum • Available in off-the-shelf and customizable formats • e MicronSensIR family of Detectors offers significant opportunities for cost reduction and design simplification reducing the need for multiple individual detectors and complex optics • MicronSensIR Emitters high-speed infrared source combines a high-performance pulsable emitter with corresponding drive electronics. Designed to maximize output over 1 Hz to 200 Hz pulse rates, this source-driver combination optimizes system signal to noise performance while minimizing the overall footprint Applications: Markets: • Gas analysis and detection • Medical • Greenhouse gas monitoring • Environmental • Fire and spark detection • Industrial safety • Flame monitoring • Rail Safety • Emission monitoring • Automotive & Aviation • Process and quality control • Underground & Tunnel Safety Q U A L I T Y S E R V I C E I N N O V A T I O N w w w . l u m e x . c o m 7 0 7 . 3 0 3 . 3 8 3 7 02/28/2011
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QU ALIT Y SER VICE INNOVATION MicronSensIR™ · - CO2, CO and HC at 4.62, 4.60 and 3.34 microns respectively - Optical reference at 3.85 microns • Covers 1- 5 microns for near-
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w w w . l u m e x . c o m 7 0 7 . 3 0 3 . 3 8 3 7
MicronSensIR™Infrared Emitter and Detectors
New Technology Provides Industry-Leading Sensitivity, Reliability and DurabiltyIn the detection and identification of gases in the 1.0 to 5.5 µm infrared region, PbS and PbSe detectors provide unparal-leled sensitivity versus cost. In addition to their best-in-class performance statistics, Lumex’s new MicronSensIR family of infrared emitter and detector products are ideal for a wide range of applications.
Features: • Industry-leadingsensitivityof1.5E10Jonesacrossthe1to5.5microninfraredspectrum • Availableinoff-the-shelfandcustomizableformats • TheMicronSensIRfamilyofDetectorsofferssignificantopportunitiesforcostreductionanddesignsimplification reducing the need for multiple individual detectors and complex optics • MicronSensIREmittershigh-speedinfraredsourcecombinesahigh-performancepulsableemitterwith correspondingdriveelectronics.Designedtomaximizeoutputover1Hzto200Hzpulserates,thissource-driver combinationoptimizessystemsignaltonoiseperformancewhileminimizingtheoverallfootprint
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MicronSensIR™ InfraredEmitters
LumexP/N:SNR-40636ProductSpecificationsMicronSensIR™ Infrared EmittersLumex’shigh-performanceMicronSensIRInfraredEmitters, combine a high-speed pulsable emitter with its corresponding drive electronicsonacompact14pincircuitboard.Designedtomaximizeoutputovera1Hzto200Hzrangeofpulsespeeds,these complementary assemblies enhance signal to noise performance, whileminimizingtheoverallsystemfootprint.
Theconstructionandimplementationoftheemitterandcontrolcircuitry,optimizeperformancebymatchingthedrivewaveform forthedesiredoperatingfrequency.Thisensurespeakoutputtem-peraturesatallpulsefrequenciesandpromotesthehighestoutputforanyapplication.Withtypicalpulsespeedsof180Hzand50%modulation depth, even trace elements in low parts per million con-centrations can be accurately detected.
TheMicronSensIRInfraredEmitterssub-systemisanidealsolutionforavarietyofapplications.Thecontrolcircuitrywillexploitthecapabilities of the high-speed source in any application, pulsed or steady state. With this emitter and controller set, designers can now focusonmaximizingtheoverallsystemperformanceratherthaninterfacingwiththesource.
MicronSensIR PbS High Sensitivity Infrared Single Element DetectorsMicronSense™PbShigh-sensitivityinfrareddetectors(single-channeldetector)integraterecognizedPbStechnologywithproven manufacturing processes to provide the highest sensitivity detectors across the 1 to 3 micron spectrum. In addition,theseproductsminimizemaintenancecostandassuredependableoperationwithindustry-leadingreliability.
Availableinseveralconfigurations,customerscanchooseelementsize,coolingalternativesandpackagesizetosuitavarietyofsystemandapplicationrequirements.Cooledunitsprovideadditionalsensitivityforverylowlevelsignaldetectionand enhance stability for environments where temperatures are in constant flux.
MicronSensIR™ Infrared DetectorsLumex’s MicronSensIR Infrared PbSe and PbS detectors are available in single element and multi-element formats and provide industry-leadingsensitivityof1.5E10Jonesacrossthe1to5.5microninfraredspectrum.
In the detection and identification of gases and materials in the 1.0 to 5.5 µm infrared region, PbSe and PbS detectors provide unparal-leled sensitivity versus cost.
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MicronSensIR™ InfraredDetectors
LumexP/N:SNR-40029ProductSpecificationsMicronSensIR PbSe Single Element Infrared DetectorsMicronSense™PbSeSingleElementInfraredDetectors(single-channeldetector)familyintegratesrecognizedPbSetechnologywithproven manufacturing processes to provide the highest sensitivity detectors across the one to five micron spectrum. In addition, MicronSense™PbSeSingleElementInfraredDetectorsproductsminimizemaintenancecostandassuredependableoperationwithindustry-leading reliability.
Thehighsensitivitymaximizesmeasurementdynamicrangeforapplicationswithtraceelements.Real-timemeasurementsareeasilysupportedwiththeMicronSense™PbSeSingleElementInfraredDetector’sfastresponsetime.Highdurabilityandlonglifeminimizerepair and maintenance costs.
Availableinseveralconfigurations,customerscanchooseelementsize,coolingalternativesandpackagesizetosuitavarietyofsystemandapplicationrequirements.Cooledunitsprovideadditionalsensitivityforverylowlevelsignaldetectionandenhancestabilityforenvironments where temperatures are in constant flux.
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MicronSensIR™ InfraredDetectors
LumexP/N:SNR-40186ProductSpecificationsMicronSensIR High Performance Multi-Channel Infrared DetectorsNewapplicationdemandsaredrivinginstrumentmanufacturerstomeasuremoreelementsinsmallerdeviceswithoutsacrificingperformance.Tomeetthesechallenges,Lumex’sMicronSensIRHighPerformanceMulti-ChannelInfraredDetectorsproductfamilyprovidesfourdiscreteopticalchannelsinacompactTO-5package.Offeringlong-life,high-sensitivityPbSedetectors,MicronSensIRproducts cover the 1-5.5 micron spectrum for near- and mid-infrared applications.
MicronSensIRHighPerformanceMulti-ChannelInfraredDetectorsprovides industry-leading sensitivity in the detection of up to four dis-tinctgasesinthe1.0to5.5µminfraredregion.Combiningthesuperiorsensitivity,highqualityandexceptionalreliabilityoftheMicronSensIR™products,thesedetectorsofferthefourchannelswithunmatchedchannelisolationandacompactTO-5footprint.Inaddition,theyprovideopticalfilteringCO,CO2andCH4(methane).Thefourthchannelistypicallyusedasanopticalreference(filteredat3.8um)tominimizemeasurementdegradation from obstacles in the optical path.
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MicronSensIR Integrated Detector AssemblyLumex’sMicronSensIRIntegratedDetectorAssemblyincorporateselectronicswhilestillprovidingtheexceptionalsensitivityofthe2mmsquarePbSedetector(2.8xx1010cmHz1/2w-1peakD*)acrossthe1to5.5micronspectrum.Idealforportableinstruments,wheresize,durabilityandcostsaresoimportant,thiscompactdetectorprovidesa10dBgainamplifier,acoolerandathermistorallwithinahermeticallyshieldedpackage.Thisconfigurationhelpsminimizesystemnoise,optimizingthemeasurementdynamicrange,while reducing the system footprint and costs.
Thecompactsizesignificantlyreducesthefootprintascomparedtotraditionaldetector schemes and provides a hermetically sealed assembly for harsh environ-ments.MicronSensIRIntegratedDetectorAssemblyisidealformanufacturersofportableequipmentwheresize,durabilityandcostsaresoimportant.
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MicronSensIR Integrated Detector Assembly - Operating InstructionsTheMicronSensIRIntegratedDetectorAssemblyconsistsofaPbSe2x2mmdetectorwithanintegratedlow-noise10gainbuffer/ampli-fier,thermistor,andThermoelectricCooler(TEC).TheThermoelectricCooleristypicallyconfiguredwithatemperaturecontrolcircuitusingthethermistortoprovidefeedbacktothecontroller.Additionally,alownoisevoltagesourceisrequiredalongwithameasuringinstrument,suchasawaveanalyzerorA/Dconverterandasoftwarepackage,suchasLabview.Amodulatedor“chopped”infraredsourcebetween50-500HzisneededtoobtainVooutputbetween0-1000μVAC.Itisimportanttofollowtheguidelinesprovidedinthisdocument to achieve the optimal performance.
TypicalSystemDiagram
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Measuring Instrument
Thesignaloutputwillvarydependingontheapplication.Atypicalsignalwillbeintherangeof10-1000μV.Thesignalvalues(inμV)reportedonthetestdatasheetarevaluesobtainedbyconnectingawaveanalyzerdirectlytotheoutputoftheIDAwithoutfurthersignal conditioning or amplification.
Specialattentioninconnectingthisandcertainothersensorsshouldbepaidwhendetermininghowtoconnectthegrounds.Theyshould be constructed so that all grounds have a single path to earth.
AThermoelectricCoolerusesthePeltiereffecttoconvertDCcurrentintoadifferentialtemperature(ΔT)andissometimesreferredtoasaSolidStateHeatPump.Asthenameimplies,thedevice“pumps”heatfromoneplacetoanother.Heat(Q)istypicallypumpedfromtheobjectthatisbeingcooledtotheatmosphere.Itisveryimportantthatthethermalresistanceinthispathbelowenoughtodissipateboth the heat being pumped and the heat generated by the cooler itself. If it is not, the cooler and the device will overheat, damaging both components.
Whendesigningandusingathermoelectricallycooledpackage,someimportantitemstoconsideraretheheatsinkselection,themounting method, and the current limit of the control electronics.1.HeatSinkSelectionAproperheatsinkmustbeused.Heatcanbegeneratedbythedevicebeingcooledandalsobythethermoelectriccooleritself,totalingseveralwatts.Theselectedheatsinkmustbeadequatetodissipatealloftheheatbeinggeneratedandpumpedbythecooler.Theheatsinkrepresentsthefinalthermalresistancetotheatmosphere,soitsdesigniscriticaltotheperformanceandlongevityofthedevice.Inadequateheatsinkdesign,mountingorsizewillreducedetectorperformanceandcouldleadtoearlyfailureofthedeviceandcooler.
Toreducethethermalresistanceattheheatsink/packagethermalinterface,themountingsurfacesmustbeflatandfreeofanyburrsorprotrusionsonany“casting”surface.Reducingthethermalresistanceatthisinterfaceisaidedbytheuseofthermallyconductiveinter-facematerialsbetweenthebackofthepackageandtheheatsink.ThermalcompoundsareprovidedbycompaniessuchasWakefieldEngineering.Tomaintainaconsistentthermalpathbeyondfive(5)years,athermalpadmustbeusedinplaceofthethermalcom-pound.ThiswillincreasethethermalresistanceandtherebyreducethecoolerdeltaTbyasmuchasten(10)percentbutcanincreasethedevicelifetimeifproperlyassembledandtightenedwheninstalledintotheheatsinkassembly.Theassemblyandtorquearealwaysvery critical, but even more so when using a thermal pad in place of the compound.
Avoidbendingthepins.Iftheymustbebent,useapairofbendingpliersortweezerstoisolatethebendareafromtheglass-filledseal.Multiple bends of these pins will lead to pin failure.
3.ControlElectronicsExternalelectronicsareresponsibleforcontrollingthetemperatureandprotectingthepackagefromoverheating.ΔTincreaseswithincreasing current (I) up to the point that the internal heating is greater than the heat pumping capacity. Increasing the current beyond thatpointwillheatthedevice,possiblytodestruction.Thethermistorshouldbeusedtoprovidefeedbacktocontroller/powersup-plycircuitry,whichregulatestheinputpowerandmaintainstheappropriatesetpointtemperature.AcurrentlimitmustbesetonthecoolerpowersupplywhichislessthanImaxandalsopreventsoverheatingforthecoolerinuse.Notethatthepointatwhichacooleroverheats depends directly on the thermal resistance to the atmosphere and the ambient temperature.
TheTECcanberuninopen-loopmodewithafixedvoltage.Thiswillincreasethesensitivityandspectralresponseofthedetectorbutdoes not reduce temperature-induced sensitivity fluctuations.
4.SummaryTheperformanceofdetectorpackageswiththermoelectriccoolersisdirectlyrelatedtotheadequateheatsinkingofthepackage.Thermalresistanceisminimizedbyproperheatsinkselectionandmountingusingathermalinterfacematerial.Overallcontrolandprotection is the responsibility of the system cooler control electronics. Proper thermal and electronic design will prevent damage and optimizetheperformanceofthedetector.
Failuretouseproperhandling,heatsinking,thermalpath,mountingmethods,and/orpowerlimitswillvoidanyexpressedorimpliedwarranty by Lumex.