回轉體三維表面形狀檢測研究.pdf

1、中國科學技術大學碩士學位論文回轉體三維表面形狀檢測研究姓名：韓耘申請學位級別：碩士專業(yè)：固體力學指導教師：何世平2002.6.1川轉休二維嵌llIf彤狀榆測研究AbstractThetechniqueofautomatictopographymeasurementplaysaveryimportantroleinmanufactureandmoldingofsolidobjects，inverseengineeringinCAD／CAM

2、，onlinequalitycontrolinproductionline，visualidentificationofroboticsandSOonGratingprojectedmethodcallanalyzethedeformedgratingdirectlytoobtaintheheightinformationofobjects，withoutneedingareferencegratingItreducesthedeman

3、dofmeasuringequipmentsComparedwithtraditionalnmir6method，gratingprojectedmethodhasamoresimpleprincipleandispaidmoreandmoreattentioninrecentyearsWhilethe3Dtopographyoflargeobjectsaremeasuredbygratingprojectedmethodinsitu，

4、someproblemsshouldbeconsidered，suchasthecalibrationofcoordinatesystemandgeometryparameters，thevariationofgratingperiodcausedbylargeprojectedangelandSOonThoseproblemsshouldberesearchedtoguaranteethemeasuringprecisionTheca

5、librationoftheCOOrdinatesystemandgeometryparametersiSprovidedinthisPaDerTheformulasthatconsiderthevariationofgrateperiodarededucedCalibrationexperimentalresultsaregivenandexperimentalprecisionisdiscussedcarefullyWhengrat

6、ingprojectedmethodisusedtomeasurethetopographyoflargeobjectsorrevolvingobjects，fhewholefieldtopographymeasurementcannotbeaccomplishedinonetimeaccordingtOthelimitationofcameraangleprojectangleandtheprofileofobjectsSeveral

7、photosofprojectedgratingspatternsshouldbetakenfromdifferentcameraandprojectangelsHOWtocombinethemeasuringdataofgratingprojectedpatternsisakeyfactorofmeasuringthetopographyofrevolvingobjectsAnewdatacombinationmethod，which

8、iSbasedoncylinderCOOrdinatetransfoim。isproposedinthispaperTheequationsandoperatingstepsareintroducedwiththeverificationofexperimentsFFTorphaseshiftingmethodisusedtounwrapthephaseofgratingsintraditionalmethodButinsomesitu

9、ationsuchasatthediscontinuityofobjects，thosemethodswillbringfaultsinunwrappingphaseDualgratingphaseunwrappingmethodisdiscussedinthispaperandexperimentsresultsareprovidedKeyword：3Dtopographymeasurement，Gratingprojectedmet