電極式實驗室海水電導(dǎo)鹽度計的研制.pdf

1、中國海洋大學碩士學位論文電極式實驗室海水電導(dǎo)鹽度計的研制姓名：孫寶華申請學位級別：碩士專業(yè)：控制理論與控制工程指導(dǎo)教師：王建國20070601ELECTRODETYPELABORATORYCoNDUCTANCESALINoMETERAbstractSeawaterssalinityisallimportantfactorofoceanichydrologytheaccuratemeasureofsalinityplays鋤importa

2、ntroleinoceanographyresearchandthenationaleconomyandthepeople’SlivelihoodAftertheestablishmentofpracticalsalinityscale1978，theelectricalconductivitymethodbecomesthemaintechnologyforthesalinitymeasurement，becausethismetho

3、dhasmanyadvantages，suchashi【ghaccuracy、quickspeedandeasyforfieldmeasurementThisdissertationintroducesaaccuratemeasurementtechnologyinnonthermostatcondition，itusesbalancebridgetomeasurerelativeconductivitytheaccuracyis：tO

4、003(thesalinityvalue)，thesensitivityis105(thesalinityvalue)，theprecisionisbeaerthaniO001(thesalinityvalue)，andtherangeofmeasurementis2—42Tlisdissertationintroducesthedevelopmentalsituationondomesticandinternationalsalini

5、tymeasuretechnologyfullyanalyzesandelaboratestheprincipleofsalinometerespeciallyintroducesthekeytechnologyandthedifficultyinsalinometerThisdissertationintroducesthewholescheme、thehardwareelectrocircuitdesignandsoftwarede

6、signtheresultofexperimentonsalinometerispreferredattheendofthedissertationSalinometerisbaseonSOPCtechnologyandusedigitaltechnologytodesigncircuit：theexcitationsourceforbalancebridgeisgeneratedbydi百talmethod，itsshape、ampl

7、itudeandfrequencyCanbecontrolbydigitalsignal，thestandardbranchofbridgeiscomposedofthreedigitalanalogconversion，andUSeSthemethodofsuccessiveapproximationtegulatethebalanceofbridgeThelli曲sensitivedigitalgalvanometerwhichde

8、tectsthebalancedegreeofbridgeisalsocontrolbydigitalsi印a1，itsgainiscontrolbysoftware，andturns’theoutputvoltageofbridgetodigitalsignal，thenusesoftwaretojudgethebalancedegreeofbridgeWaterroadcontrolling、temperaturemeasuring

9、ofseawater、theelectromagnetismstirrerandotherpartwhicharerelativewithbridgearealsocontrolbydigitalsignalWedesignhardwarelogicforsalinometerwithQuartusIIsoftware，anduseSOPCBuildertodesignNiosIICPU、arithmeticalunit、MEMORY、