电阻层析成像技术软场特性及图像重建算法研究

《电阻层析成像技术软场特性及图像重建算法研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、浙江大学硕士学位论文电阻层析成像技术软场特性及图像重建算法研究姓名：李英申请学位级别：硕士专业：检测技术与自动化装置指导教师：黄志尧2003.1.1浙江大学硕士学位论文特性基本相同。4．对常用的ERT图像重建算法进行了理论分析和仿真研究，指出了它们的优缺点。建立了新的ERT图像重建算法的数学模型，提出了一种将Tikhonov正则化方法和代数重建算法(ART)}H结合的组合型图像重建算法，研究表明该算法是一种较为稳定的算法，具有克服测量数据波动对图像重建的影响的能力，同时仿真研究表明该算法在一定程度上提高

2、了图像重建的质量。)p7。一关键词层析成像、Ⅱ浙江大学硕士学位论文ABSTRACTTwo—phaseflowsystemiswidelyappliedinindustry．Thestudyoftwo．phaseflowparametermeasurementtechniqueisanimportantresearchfield．ProcessTomographytechniqueisanattractivedevelopmentorientationforthetwo—phaseflowparamete

3、rmeasurement．Itprovidesaneffectiveparametermeasurementmean，bywhich2D／3Dinformationofthetwo-phaseflowsystemcanbeobtained．ElectricalResistanceTomography(ERT)technique，whichisbasedonresistancesensorprinciple，hastheadvantagesoflow—cost，non—intrusive，fast-res

4、ponding．Asanovelmeasurementtechnique，ERTcanplayanimportantroleintheon-lineparametermeasurementofthetwo—phaseflowsystem．However,thedevelopmentofERTispreliminary,manyproblemsshouldbesolvedbeforeitspracticalapplications．TwoofthekeyproblemsofERTtechniqueares

5、tudiedinthisdissertation．Themaincontributionsarelistedasfollows：1．ThestateoftheartofProcessTomographytechniqueisreviewed．TheforwardproblemandinverseproblemofERTareanalyzedi珏eexistingproblemsarediscussed．Meanwhile．itiSemphasizedthattheSOft-fieldcharacteri

6、sticandthelOWresolutionofimagereconstructionarethekeyproblemsthatresultinthedifficultyofitspracticalapplications．2．ItiSverydifficulttoanalyzethecharacteristicsofthe2Dnon．homogeneousfieldsor3Dfieldsbyusinganalyticalmathematicsdirectly．Afiniteelementsimula

7、tionsoftwareiSdevelopedforERTsystem．111emainfunctionsincludetheself-divisionoffiniteelement，thesettingofflowpatternandthesolutionoftheforwardproblem，eta1．．Also．itiSthefoundationofotherresearchWOrkinthisdissertation．3．ThesensitivityfieldofERTsensorisstudi

8、eddetailedlybyusingthesimulationsoftware．Throughtheanalysisofthesoft．fieldcharacteristic．itiSfoundthatthesensitivityfielddistributionisaffectedbythelocation，thesizeandtheconductivityofthedispersephasemedium．Meanwhile．theso