進口核子密度計核子密度計又稱為核密度計、核濃度計、核子濃度計。進口核子密度計精度高、運行穩(wěn)定。廣州瑞發(fā)提供類似進口核子密度計的國產核子密度計產品，即國產核密度計。國產核子密度計性價比好，價格低。下面為核子密度計英文介紹：RADIOMETRICMEASUREMENTOFDENSITYWHYSHOULDDENSITYBEMEASURED?Inmanyindustrialprocessesknowledgeaboutthedensityisrequired-beitspecificgravityorbulkdensity-todrawaconclusiononprocessparameters.Inmanyinstancesdensityisonlyameasureforotherproperties:Byusingdensityitispossibletodeterminetheconcentrationofamixconsistingoftwomaterialsorthecontentofsolidmatterwhentransportedthroughpipes.DENSITYCANBEMEASUREDCONTINUOUSLYINRUNNINGPROCESSES.WHATARETHECAPABILITIESOFRADIOMETRICDENSITYMEASUREMENT?核子密度計能測量什么?Theresultoftheabsorptionmeasurementisinfluencedbytheaveragedensitybetweenthedetectorandthesourceofradiaton.Allthosepartswhicharecrossedbythemeasuringbeamanddonotchangeduringoperationareincludedinthecalibratetion.Sinceonlythemeduimtobemeasuredissubjecttochange,itispossibletodetermineexactlythedensity.Itisimportantthattheaveragedensityisused.Thusonecanconcludetootherproperitesfromthismeasurement:specificdensity,concentrationofsolidmatter(i.e.coal,ore,salt)andconcentrationofmixes(acids,lye,contentofsugar).HOWDOESITWORK?核子密度計如何工作？AnelectromagneticwavecalledGammaradiationwiththesamepropertiesofX-raysisweakenedaccordingtoitsdensitybypassingthroughmatter.Whenafixedintensityisknowrelatingtoitsdensity,theratiotoeveryotherdensitycanbecalculatedaccordingtotheintensityitletspassthrough.Likeanx-rayphotographhasitsdarkpartswherethedensityishigheralsotheintensityoftheGamma-raysbecomeslowerwithahigherdensity.Ahighaccuratdeterminationoftheintensitytherforeisabletodeterminethedensitytoapointwherelaboratoriessometimeshavedifficultiestoundercuttheerror.Toachievethisonlyafewcomponentsarenecessary:Thesource,installedinasecureleadshielding,furtherahighsophisticateddetectorandanevaluationunit.WHERECANMEASUREMENTSBEPERFORMED?Aconstantmeasuringdistanceisnecessarytodeterminethedensityexactly.Thesimplestwaytoachievethisismeasuringthroughapipe.Butitisalsoachievableinatankorabunkerbyaspecialconstruction.Contactlessmeasurementisalsopossibleinacontainer:Neitherthesourceofradiationnorthedetectortouchthemedium.TECHNICALDETAILS:核子密度計技術參數THESOURCEOFRADIATION:核子密度計放射源Toobtainasimplesourceofradiationanartificialradioactivemetalormetaloxideisused.Itisweldedintoahighsecuritycapsulemadefromstainlesssteel.Thecapsuleisthoroughlycheckedaccordingtointernationallaw-forexampleitwasheateduptoaveryhightemperatureandthenputintoicewater,ashocktestwasperformedetc.Theradiationcanemitthroughthewallofthecapsule,sotheradioactivematerialcanremaininitforever.Sincethesourceemitsradiationinalldirections,itisbuiltintoacontainermadeoflead.Thiscontainerhasasmallchannelfacingthedetector.Thechannelcanbeclosedfortransportorduringworkneartothemeasuringbeam.THEDETECTOR核子密度計探測器Whenradiationistobemeasureditmustbeabsorbed.Itpassesthroughagasdetectornearlyaneffectedsotomeasureacertainamountitneedsabiggersource.Ahighdensmaterialcanabsorballtheradiationcommingin.Thistypeiscalledscintillationdetectorwithcrystalwhichconvertsradiationintoflashesoflight.Thelightisamplifiedbyaphotomultiplierandisthenregisteredelectronically.Aspecialstabilizingcircuitrywhichanalyzesthespectrumoftheradiation,andkeepsconstantthecharacteristics,providesforexactmeasurementinspiteofalteringtemperatureandaging.THEEVALUATIONSincethedetectoralreadydeliversadigitalsignal,thesuccessingcircuitryonlyhastoperformthemathematicalconversionandthecalibration.AprocessorcardbuiltwithSMDsallowsforallfunctionstoresideonasinglecard.Thisdevicetakesintoaccountallpossibleapplications.Includedarethepowersupplieswith230,115,and24VACorDC.AbacklitalphanumericalLCdisplayallowsaneffectivedialogueandaverysimplewayofoperationinspiteofthecomplextask.Afterinstallationthelevelofdensityisdisplayed,whichonlyhastobecorrectedinteamworkwiththelaboratory-throughautomaticcalculationoftherequiredparameters.Theregisteredvalueisputoutdigitally,byabargraphandwithapotentialfree0/4-20mAoutput.Ofcoursetherearealsofreelyadjustablerelaisswitches.TECHNICALDATAEVALUATIONUNITSupply:Standard:-230V~Optional:-115V~,24V~,24V=Counterinputs:2counters1,2,4or8cyclespersecondDigitalinputs:4galvanicisolatedinputsDigitaloutputs:Standard:4potentialfreerelaiscontactsOptional:4electronicrelaisCurrentoutput:Standard:1analogoutput(potentialfree)Optional: 2currentoutputfor2ranges(0..20mAor4..20mAselectable) detectionofwirebreakAdditional:illuminated4-line-LCDisplay(4x16char.)keyboardwithtactileandacousticalnotificationBatterieholdviaLithiumcellWatch-Dogfunctionoptional:-serielleRs232interfaceTemperature:0 -55 C(envirement)Size: 101,4mm(20TE)x132,5(3HE)x160mm(WxHxD)Weight: 318gCabinet:IP54SHIELDINGSteelcasewithnormalflangeC125x133DIN2631Weightapprox.40kgShieldingthroughleadfillingwithCs-137approx.10HWSDETECTORScintillator: NaJ/TI(normal50x50mm)Stabiltity:+/-0.1%between0-50 CHighvoltage:generationindetectorOutput: squarepulsesCabling:Connectionthreewires(normal0,75mm )Weight:approx.18kg