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1、中國農業(yè)大學博士學位論文土壤水分快速測量方法及其應用技術研究姓名:趙燕東申請學位級別:博士專業(yè):農業(yè)電氣化與自動化指導教師:王一鳴2002.5.1AbstractAspartoftheNational‘‘95”keyproject(No:96A2302—010)oninstrumentationsupportedbymeMinistryofScience&TechnologyMinistrythisstudytookthebehavio

2、rofsoilwatersystemdielectricsasakeypointforfurtherdevelopmentandevaluationofanewkindofStandingWaveRatio(SWR)soilmoisturemeasuringsystemAseriesofacademicanalysisandalotofexperimentresearchonSWRbasedsoiImoisturesensorwerec

3、arriedoutandpresentedinthispaperOnthebasisoftheresearch,anewsoilmoisturesensor,whichitisverysuitableforfielduse,wasdevelopedAttheSaluetimeanewsystemtomeasurethespatialdistributionsofsoilmoisture,whichcanbeusedcombiningwi

4、thGlobalPositioningSystem(GPS),wasdevelopedtooIngeneral,thestudyreportedin11isdissertationcanbebrieflysummarizedasfollows:1ThroBglltheoreticalanalysisonthebehaviorofsoil—watersystemdielectrics,itisproved山atthereafpartsof

5、thedielectricconstantun出rhj吐frequencyormicrowaveCallbeusedc0measuresoilwatercontentrapidlyThismethodcangetalotofmeasurementresultswithhighaccuracyandwideapplicabilityInaddition,theresultsareseldomaffectedbythespatialvari

6、ationofsoilpropertyAsafurtherapplicationoftheaboveresult,asoilmoisturesensorbasedonStandingWaveRatiowasdeveloped2InthisdissertationakeypointofthestudyistobuildupamathematicalmodelofthecharacterimpedancetheSWRsensoLThestr

7、uctureoffourequallengthprobescarlbeviewedasaspecialfonTlofcoaxialtransmissionlineCombiningthecharacterimpedanceofcoaxialandtheparalleltransmissionline,thecharacterimpedancemodelofprobewithequalinglengthwasbuiltupbyutiliz

8、ingmathematicaltheoryofapproachAndthen,thecharacterimpedancemodelofSWRprobewasbuiltupandvalidatedbyexperiments3ThespatialsensitivityofSWRsensorwasanotherkeypointinthisstudyByanalyzingelectrostaticdistributionaroundprobes

9、,itwasfoundthatthespatialsensitivityofSWRsensorisaconewhosecenteristhemiddleprobeandradiusissmallerthanthedistancebetweenmiddleprobeandaroundprobeThecorrectnessofthisconclusionhadbeenvalidatedbyexperimentstoo4Largeamount

10、soflabexperimentsshowedthattheconsistencyofSWRsensorisverygood,andtheSWRsensorhaveexcellentresultsineverykindsofsoiltexture,especiallyinloam,clayandacidloar/]TherewerenotbigvariationsamongtheirmeasurementresultsThecorrel

11、ativetoefficientoftlleirmeasureddataamvedat097UnderthesupportofFederalAgriculturalResearchCenter(FAL)ofGermanyaseriesofexperimentshadbeendonetocompareSWRsensorwithTDRsensormadebyGermanyandFDsensormadebyHollandTheresultss

12、howedthattheperformanceoftheSWRsensorisasgoodasothersensorsInaddition,theresultfurthershowedthatt11eSWRsensorhaveexcellentresultsIneverykindsofsoiltexture5Tomeettheneedsofsoilmoisturemonitoringandvariableirrigationameasu

13、rementsystemnamedModelTSCIVintelligentmonitorformeasuringthespatialdistributionsofsoilmoisturewasdevelopedSWRbasedsoilmoisturesensorwascombinedorconnectedwithA9132G10balPositioningSystem(GPS)inthesystemnecollectionandpro

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