應(yīng)用AOTF的近紅外光譜牛奶成分測量技術(shù)的研究.pdf

1、天津大學(xué)碩士學(xué)位論文應(yīng)用AOTF的近紅外光譜牛奶成分測量技術(shù)的研究姓名：王文波申請學(xué)位級別：碩士專業(yè)：測試計量技術(shù)及儀器指導(dǎo)教師：蔣誠志陳林才20020501AbstractTheelectromagneticwavewithitswavelengthbetween7802526nmhasbeencharacterizedasNearinfraredlightNIRradiationsaretransparenttosomemateri

2、als，suchasglassandplasticforpackaging，thereforenosamplepreparationisneededandmuchconvenienceisbroughttothemeasurementofspectraNIRisthuscalledanondestructiveanalysistechniqueThemainadvantageofNIRmeasurementliesinthat，∞ara

3、pidparallelindirectmeasurementmethodofphysicalandchemicalpropertiesofsamplesspectrameasurementc∞substituteforoneorseveralmeasurementmethodswhicharetimeconsuminganddi師cultNIRhasbeenwidelyappliedinthefieldofpharmaceutics，a

4、nalyticalchemistryandagricultureforitsspeedinobtainingspectralpropenyofsamplesWiththeintroductionofopticfiberprobe，morepotentialofNIRdetectiontechniquesisrevealed，andonlinespectracollectionofsolidsamplesCallbeenachievedW

5、iththeboomofcomputertechnologyspectrasamplingtechniquesaregreatlyenhancedinrecentyears，Byadoptingfastdataacquisitioncardwithbetterresolution，multichanneIsamplingofspectradatawithhighspeedandaccuracycanbeperformedandtheme

6、asurementefficiencyisimprovedSimultaneouslytheapplicationofchemometricsfurtherpromoteNIRtechnologyThesignificanceofusingmultivariateanalysisforspectraprocessingisthatinformationmatrixconcerningphysiealandchemicalproperti

7、escarlbeextractedthrou曲simpleandfastspetrameasurementByutilizingmultivariateregressionmethods，suchasPCR，PLSere，thespectramatrixCallbetrainedforpredictionofnewspectraTherefore，theexpensive，exhaustingorevenhaphazardmeasure

8、mentmethodscanbereplacedbymathematicaltreatmentFormorethanacentury，variousanalysistechniqueshavebeendevelopedtodeterminethenutrientconcentrationsinAgriculturalproductsduetoitsimportanceHoweverastraditionalmethodsaretimec

9、onsumingandeostl％arapidandconvenientmeansisbadlyneededNIRspectroscopytechniquecallprovideanalysisresultsatlowcostandwasfirstappliedindeterminingmoistureinagriculturalproductSatisfactoryresultsarealsoachievedwhenNIRwasuse

10、dtoanalyzeprotein。moisture，fibersugaretcincerealandfarmfeedDailyinspectionofdairyproduct’squalityprovidedimportantinformationfordairymanagementAsproteinandfatinmilkisimportanttoitseconomicvalue，arapidandaccuratedetermina

11、tionmethodisneededThereafetwoaspectsofNIRspectroscopyanalysisthatneedattentionOneistheaccurateandstablehardwaretechniques(spectrometers)toacquiretheahsorbanceorreflectancespectraofsamplesTherequirementofstabilityofhardwa

12、reisthatstablespectraconcerningtheconcentrationsofanalytesofinterestcanbeobtainedwithenoughrepeatabilityduringalongperiod丁№otheraspectisthatarobustmathematicalmodelwithcertainpredictabilityshouldbesetupbyusingmultivariat

13、edataanalysistechniques，ThispaperisconcentratedontheanalysisoftheAOTFbasedspectrometricinstrumentformilkcomponentAsoneoftheparticipantoftheinstrument’sdevelopmenttheauthormadeconstructiveexplorationofthewholemeasurements

14、ysteminpracticeIntermsoftheoryNIRtechniquesinvolvesbasicprinciplesofabsorbaneeordiffusedreflectance，spectroscopicalprinciples，multivariatedataanalysisandstandardizationofinstrumantsetcThingsshouldbeconsideredinopticaldes

15、ignaretheefficientuseofsourcelight，eliminationofstraylight，andinfluenceintroducedbyopticfiberetc；lnGaasphotodiodeintegratedwithpreamplifierandButterworthbandpassfilterisappliedintheprocessingofanalogsignal；dataacquisitio