Testing of large optical surfaces with subaperture stitching

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1、TestingoflargeopticalsurfaceswithsubaperturestitchingShanyongChen,*ShengyiLi,YifanDai,andZiwenZhengCollegeofMechatronicEngineeringandAutomation,NationalUniversityofDefenseTechnology,DeyaRoad,Changsha,Hunan,China410073*Correspondingauthor:shanyongchen@tom.comReceived6F

2、ebruary2007;accepted5March2007;posted12March2007(Doc.ID79817);published18May2007Basedonourpreviouslyproposedsubaperturestitchingandlocalization(SASL)algorithm,wepresentstrategiesandaprototypefortestingoflargeopticalsurfaceswithsubaperturestitching.First,severalstrateg

3、iesareintroducedtodealwithnewproblemswhenapplyingtheSASLalgorithmtolargesurfaces.Theuncertaintyofthelateralscaleoftheinterferometeriscompensatedinthesamemannerasthatoftheradiiofbest-fitspheresinthealgorithm.Thenthecoarse–finestitchingstrategyisproposedtostitchtensofsuba

4、perturesefficiently.Second,aprototypefortestingoflargesurfaceswithsubaperturestitchingisdevelopedwithaweldedstructuralbase.Themodelofkinematicsisbuilttodeterminetheinitialconfig-urationofeachsubaperture,accordingtotherecordsofnullingmotion.Theuncertaintyoflinearmotionis

5、requiredtobenomorethan1mm,takingadvantageofthelargerangeofconvergenceoftheSASLalgorithm.Finallywepresentanexperimenttoverifythevalidityofthemethodandtheprototype.Asphericalsurfaceistestedandsuccessfullystitchedwith37subapertures.©2007OpticalSocietyofAmericaOCIScodes:1

6、20.3180,120.4630,220.4840.1.IntroductionSAToflargesurfaces,intermsofhighstabilityandThesubaperturetesting(SAT)methodhasbeendis-highprecisionwithinalargeworkspace.cussedformorethan20years.MosteffortswereQEDhasbeenmakingeffortstotesttheTerrestrialmadetotestlargeplanoopt

7、ics.However,in2003,PlanetFinderCoronagraph(TPF-C)secondaryandQEDTechnologies[1]claimedtosucceedindevelop-theJamesWebbSpaceTelescope(JWST)secondaryinganautomatedsubaperturestitchinginterferom-mirror,attemptingtoobtaininformationabouttheeterworkstationforsphericalandmil

8、dlyasphericsurfacefigure,waviness,andevenroughness.Itwassurfaceswithaperturesoflessthan200mm.believedthatonlyengineeringdetai