基金项目

863(2004AA604060)[e-mail]orafieldhyperspectralabsorptionandattenuationcoefficientmeterofseawaterLiCaiZhouWenKeTian-cunCaoWen-xiLuGui-xin(LEDSouthChinaSeaInstituteofOceanology,ChineseAcademyofScience,guangzhou,510301)Abstract:Adataacquisitionsystemforafieldhyperspectralabsorptionandattenuationcoefficientmeterofseawaterisdesigned.Inthissystem,theembeddedcomputer(PC104)functionsasCPU,controllingthedataacquisitioncardforspectrometer,whichbasesonCPLD,FIFOandhigh-speedADCtosynchronouslymeasuretheinherentoceanproperties(IOPs)inprofiles;themetercouldworkinauto-controlledthroughreal-timeacquisitionofdepth;themeasureddatacanbedownloadbythewirelesscommunicationdevice;themeterhavethecharacteristicsofhighdensity,lowpowerconsumption,highspeedandhighadaptability;andperformanceshavebeentestedinfield.KeyWordDataAcquisitionsystem;Hyperspectrum;CPLD;Absorptionandattenuationcoefficientmeasuringmeter,Oceanoptics1.2.1/LightsourceAbsorptioncellAttenuationcellDataacquisitionsystemThree-legFibreFibrerCollimatinglensFocusingLensFocusingLensSpectrometersCollimatinglensFig.1Blockdiagramoftheabsorptionandattenuationmeter3.PC104CFCPLDPC104CCDCCDPC104WirelesscommunicationPC104PC104SequenceSignalgeneratorCCDVideoSignalprocessorSpectrometersMainPCDataacquisitionsystemofabsorption/attenuationcoefficientmeasuringdeviceDataAcquisitioncardofSpectrometerDC/DC14.4VBatteryOn-offcontrolAuxiliaryparameteracquisitioncircuitDepthAnalogsignalAttenuationcellAbsorptioncellCFCardPC104BusLightsourceVoltageRegulatorFibrePumpRadioDataTransmissionModuleRadioDataTransmissionModuleOn-offcontrolFig.2BlockdiagramforthedataacquisitionsystemFilteramplifierAnalogmultiplexersAbsorptionsignalReferencesignalAttenuationsiganlADCPC1042KFIFOPC104busFig.4DataacquisitioncircuitdiagramforCCDDrivepulseforCCDSequentialgeneratorXR5064CBufferBufferSyncpulseforADCSyncpulseforoutputbufferExternalclockControlsignalPowerPC104busFig.3Constructiondiagramforsequentialgenerator5.[1]JerlovN.G.MaineOptics[M].Elsevier,Amsterdam,1976.[2]FargionG.S.,MuellerJ.L.OceanOpticsProtocolsforSatelliteOceanColorSensorValidationRevision2.NASA/TM-2000-209966,2000.[3]AcklesonS.Oceanopticsresearchatthestartofthe21stcentuey[J].Oceanography,2001,14:5-8.[4]FryESKattawarGW,RopeRM.Integratingcavityabsorptionmeter[J].Appl.Opt.1992,31:2055-2065.[5]ZaneveldJRVBartzR,KitchenJC.Reflective-tubeabsorptionmeter[J].SPIE.1990,1302:124-136.[6]HakvoortJHM,BeekerAER,KrijgsmanJ.Aninstrumenttomeasureinsituvisiblelightabsorptioninnaturalwaters[J].SPIE.1994,2258:77-88.[7]PegauWS,ClevelandJS,DossW,etal.Acomparisonofmethodsforthemeasurementoftheabsorptioncoefficientinnaturalwaters[J].JournalofGeophysicalResearch,1995,100:13201-13220.[8]SvenssonSEkstromCEricsonB,etal.Attenuationandscatteringmetersforestimatinglasersystemperformance[J].SPIE.1988,925:203-212[9]CAOWen-xi,LICai,etal.Hyperspectralmeterformeasuringinherentopticalpropertiesofseawaterbasedonprincipleofdoubleopticalpath[J].OPTICALTECHNIQUE,2003,29(2):139-145.[10]