Single-Camera Digital-Image Correlation Three-Dimensional Panoramic Measurement Using Reflector Imaging

被引：4
作者：
Ge Pengxiang [1 ,2 ]
Wang Huanqing [1 ,2 ]
Zhu Yilei [1 ,2 ]
Wang Yonghong [1 ,2 ]
机构：
[1] Hefei Univ Technol, Sch Instrument Sci & Optoelect Engn, Hefei 230009, Anhui, Peoples R China
[2] Hefei Univ Technol, Anhui Prov Key Lab Measuring Theory & Precis Inst, Hefei 230009, Anhui, Peoples R China
来源：
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG | 2022年 / 49卷 / 09期
关键词：
measurement digital image correlation; single camera; plane mirror imaging; panoramic measurement;
D O I：
10.3788/CJL202249.0904004
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Objective The conventional single-camera digital-image correlation (DIC) systemcanonlymeasurethein-planedeformationinformationofthemeasuredobject 2D-relatedinformationcannotmeettheneedforhigh-precisionmeasurementsowingtoacontinuousimprovementinmeasurementrequirements AcommonDICmeasurementmethodistouseabinocularormulticameraDICsystem ThebinocularDICsystemcanobtainthemeasuredobject????sin-planeandout-of-planedeformationinformation aswellas3Dcoordinatesforstereoreconstruction Owingtothelimitedfield-of-viewofthebinocularsystem itcanonlymeasureapartofthesurface andtheconventionalbinocularDICsystemdoesnothavethecapabilityofpanoramicmeasurement ThemulticameraDICsystemcanrealizethepanoramicdeformationmeasurementundermultipleviewpoints However themulticamerasystemincreasesthesystem????ssizeandmakesthecalibrationprocessdifficult Further itresultsinhighapplicationcosts whichhasasignificantimpactontheuseofthemulticameraDICsystem Therefore a3Dpanoramicmeasurementsolutionthatiseasytouse simpletocalibrate andlowinapplicationcostisrequire MethodsThispaperproposedamirror-assistedsingle-cameraDICsystemtorealize3Dpanoramicmeasurement andtheprinciplesofplanemirrorimagingandconversionofvirtualandrealimageswerederived Thesingle-cameraDICsystemutilizedtheimagingprincipleofmultiplanemirrorswiththeassistanceofsixplanemirrors allowingthefrontandrearsurfacesofthemeasuredobjecttobeimagedinacommonfield-of-view Theleftandrightopticalpathswereimagedsimultaneouslyandeachopticalpathcontainedtwoimagesofthefrontandbacksurfacesofthemeasuredobject Consequentlythismethoddividedasinglecameraintofourvirtualcameras achievingthenecessaryconditionsfor3Dpanoramic-relatedmeasurement Tobettercompletetheconversionofvirtualandrealimages theprojectedspecklepatternwasusedtoperform3Dreconstructiononthesurfaceofthemirrorbeforeexperiments Thefeasibilityandprecisionofthemethodwereverifiedbyimplementingdynamicandstaticexperiments respectivelyResultsandDiscussionsTheopticalpathdeviceFig6isusedfordynamicandstaticrelatedexperiments andtheconventionalbone-shapedmetalspecimenisselectedforthetensiletest AsshowninFig7 thefoursubregionsareimagedinacamerafield-of-view Thestrainchangetrendofthefoursubregionsinthesamesubregionisobservedduring0--90sstretchingtimeFig8Simultaneouslystrainsinthefoursubregionsarerelativelyclose Furtheranalysisisperformedforthemomentswithlargerfluctuations andthecloudmapinFig9showsthatthestraindifferencesinthefoursubregionsarestillsmall withstrainsgenerallydistributedatapproximately0 0125 ThedisplacementchangesinFig10andFig11showthatthecalculationprecisionofthismethodishigher andasthenumberofdisplacementsincreases theaccuracyofthemethodincreasescontinuouslyThedecisioncurrencyfor3Dreconstructionischoseninastaticexperiment Thethicknesscloudand3DreconstructioneffectofthedecisioncurrencyaredepictedinFig12andFig13 respectivelyThecontourisclearerfollowingreconstruction andthecalculatedthicknessvalueisclosertothetheoreticalvalue Theexperimentaleffectofthefour-cameraDICsystemiscomparedandanalyzedwiththe3Dreconstructioneffectofthismethod Bothmethodscanreconstructthe3DshapeofthedecisioncurrencyasillustratedinFig13andFig15 Thecomparisonrevealsthatthereconstructioneffectofthefour-cameraDICsystemdoesnothaveaparticularlyprominentadvantage whichfurtherindicatesthestrongerperformanceofthemethod ConclusionsHerein aplanarmirror-assistedsingle-cameraDICsystemisproposed whichexpandsasingle-cameraDICsystemtoafour-virtual-cameraDICsystem Theplane????smirroredimagescanperformpanoramicimagingonthefrontandbacksurfacesofthemeasuredobjectfromdifferentangles andbothopticalpathsystemscanperformpanoramicimagingonthefrontandbacksurfacesofthemeasuredobject Theopticalpathseparationallowsfor3Dstereomeasurements whichcompensatesforthecommonsingle-cameraDICsystem????sabilitytoonlymeasurein-planedeformation Inthetensileexperimentofthemetalspecimen thefoursubregionshavesimilarstrainchanges strainisgenerallydistributedatapproximately0 0125 andthedisplacementprecisionincreasesasthetensilevalueincreases the3Dreconstructionexperimentofthedecisioncurrencyhasgood3Dstereoreconstructioneffect andthereisnoobviousdifferencecomparedwiththetraditionalfour-cameraDICsystem Thesystemhasasimplestructure meetstherequirementsfor3Dpanoramicdynamicdeformationmeasurement andhasapromisingfutureapplication Meanwhile futureworkswillimplementtheopticalpathsystemtobetter adapt to the needs of various application environments
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