超聲檢測技術對糖溶液的研究及其在濃度檢測中的應用.pdf

1、浙江大學碩士學位論文超聲檢測技術對糖溶液的研究及其在濃度檢測中的應用姓名：周向華申請學位級別：碩士專業(yè)：食品科學指導教師：劉東紅葉興乾20040501英文摘要AbstractUltrasonicmeasurementisbasedontheuseoflowintensityultrasonic，whichrangeatintensitieslowerthan1W／cm‘a(chǎn)ndatfrequencieshigherthan100kHzWh

2、entravelingthroughamedium，theultrasoundwavechangesitscharacteristicandtheanalysisofthischangeallowsassessmentofinnerstructureandphysicalchemistrypropertiesofthemediumUltrasonicmeasurementhasbroadapplicationsinfoodindustr

3、iesbothinprocesscontrolandproductassessmentforitsparticularadvantagesofrapid，nondestructive，noninvasiveandinexpensiveInthispaper，low—intensityultrasonicWasusedtostudytheacousticpropertiesofsugarsolutionsTherelationshipsb

4、etweenthesugarcontentsandtheultrasonicvelocityinsugarsolutionswereinvestigatedFurthermore，themodelsweredeterminedandusedtodetectthesugarcontentsinfruitjuicesanddrinksTheresultsobtainedfromultrasonicmeasurementwereprovedt

5、obesatisfiedThemainresultsindicatedasbelow：(1)TheacousticvelocityinthepuresugarsolutionswasmeasuredasafunctionofsugarcontentsInallspeciesofsugarsolution，thevelocityincreasedmonotonouslywithincreasingofconcentration，andth

6、ecorrespondingregressiveequationsofwereobtainedwithR20998ThediverseofsugarstructureisoneofthemainfactorsaffectOilthedifferenceofultrasonicvelocityindifferentsugarspeciesOntheotherhand，theadiabaticcompressibilitycalculate

7、dfromvelocitywasprovedtobemoresensitivewiththeinteractionbetweensugarandwatermoleculesthanthepartialmolarvolumeTherefore，adiabaticcompressibilitycanbeusedtostudytheinteractionbetweensoluteandsolvent(2)Thedataofultrasonic

8、velocityinmixedsugarsolutionswereplottedregularlyinonecuringplaneinthe3DpictureThebinaryregressivepolynomialequationsofexperimentalcurveswereobtainedtoshowtherelationshipbetweenultrasonicvelocityandtheconcentrationsofdif

9、ferentcompositionsItalsoshowedthattheultrasonicvelocityWasaffectednotablybytheinteractionofthecompositionsinhigherconcentrations，whileindistinctivelyinlowersugarconcentrations(roundabout30％)Thesugarconcentrationswerepred