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Bias and uncertainty in the absorption emission measurement of atomic sodium density in the SSME exit plane

Bias and uncertainty in the absorption emission measurement of atomic sodium density in the SSME exit plane

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时间：2019-08-30

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1、1990N91-18969NASA/ASEESUMMERFACULTYFELLOWSHIPPROGRAMMARSHALLSPACEFLIGHTCENTERTHEUNIVERSITYOFALABAMABIASANDUNCERTAINTYINTHEABSORPTIONEMISSIONMEASUREMENTOFATOMICSODIUMDENSITYINTHESSMEEXITPLANEPreparedBy:LeslieE.BaumanAcademicRank:AssociateProfessorandSeniorResearchScientistUniversityandMississippiSta

2、teUniversityDepartments:Physics&AstronomyandDiagnosticInstrumentationandAnalysisLaboratoryNASA/MSFC:Laboratory:PropulsionDivision:PropulsionSystemsBranch:PerformanceAnalysisMSFCColleague:Dr.CharlesF.SchaferContractNo:NGT-01-002-099TheUniversityofAlabamaIIBIASANDUNCERTAINTYINTHEABSORPTIONEMISSIONMEA

3、SUREMENTOFATOMICSODIUMDENSITYINTHESSMEEXITPLANELeslieE.Bauman*INTRODUCTIONThemeasurementofatomicsodiumconcentrationintheT'FB019firingofApril1990issignificantinthatitrepresentsthefirstmeasurementofdensityattheexitplaneofthespaceshuttlemainengine(SSME).ITheknowledgeofthesodiumdensity,combinedwiththec

4、ertaintythattheexitplaneoftheplumeisopticallythinatthesodiumD-linewavelengths,providesessentialinformationforevaluationofdiagnostictechniquesusingsodiumatoms,suchasresonantDopplervelocimetry'_fortemperature,pressure,andvelocitythroughhighresolutionfluorescentlineshapeanalysis.Thetechniqueusedforthe

5、sodiumatomlinetransmission(SALT)measurementsisthatofresonantabsorptionemissionusingahollowcathodelampasthereferencesource.ThelampprovidesnarrowbandsodiumD-lineemissionaswellasnearbyneonlinesforreferencemeasurements.Thereferenceisessentialtoaccountforsucheffectsasfluctuationsinthesourceemission,tran

6、smissionlossesthroughbeamsteeringorfoginthepath,etc.Thedetectionsystemisapolychromator,whichseparatestheneonandsodiumlinesbutspectrallyintegratesthelines.TheSALTmeasurementswerereportedatthe1990AdvancedEarthtoOrbitPropulsionConferenceandaresummarizedhereforclarity.Pre-andpost-firingoftheenginethere

7、ferenceintensitiesofthesodiumandneonlinesweremeasured;thesesignals(correctedforbackground),INa,0andINe,0,werestablewithasignal-to-noise(S/N)ratioof600to1.Duringthetest,measuresweremadeofthetransmittedsignal

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