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1、自适应光学波前传感技术主要内容1、哈特曼夏克波前传感2、金字塔波前传感3、曲率波前传感都是非相干波前测量系统工作成绩哈特曼夏克波前传感EvolutionoftheHartmanntest–standarddevicesformeasuringwavefrontslopeerrors哈特曼夏克Onemethodfortestingalensormirroremploysanopaquemaskwithholesplacedbehindtheopticalelementundertest.Eachoftheholesactsasanap
2、erture,andsincethelightpassingthroughthelensisconverging,theimageproducedisanarrayofspots.Withpropercalibration,thepositionofthespotsisadirectindicationofthelocalwavefronttiltateachhole,andthusisadescriptionofthelensquality.ThistestiscalledtheHartmanntest.Hartmanntest哈
3、特曼夏克Shackplacedlensesintheholes,whichincreasedthelight-gatheringefficiencyofthemaskand,withthespotsfocused,reducedthedisturbingdiffractioneffectsoftheholes.Alensarrayforthispurposewasfirstmanufacturedin1971.Membersoftheastronomycommunitybegantousethissensorinthelate197
4、0sfortestingoflargetelescopeoptics.SomeastronomersusethetermHartmann–Shack(orShack–Hartmann)wavefrontsensor,butmanyshortenittosimplyHartmannsensor.History哈特曼夏克TheHartmannwavefrontsensorisshowninbelowfigure.Thewavefrontisdividedbyamask,asintheclassicaltest,anarrayofgrat
5、ings,oranarrayoftransmissivelenses.Eachofthebeamsinthesubaperturesisfocusedontoadetector.Todetectthepositionofthespot,variousformsofmodulation,detectorgeometry,andelectro-opticalprocessingareused.Foratmosphericturbulencecompensation,thelocalwavefronttiltmustbemeasureda
6、ccuratelyineachsubapertureofsize.Todothis,thesubaperturemustbelargeenoughtoresolvetheisoplanaticpatch.Duringhighturbulence,issmallandanisoplanatismdegradestheprocess.Hardydiscussesdetailsofthislarge-versus-smallsubaperturetradeforvariousopticalandatmosphericparameters.
7、Hartmannwavefrontsensor哈特曼夏克HartmannwavefrontsensorHartmannwavefrontsensingtechnique.AHartmannsensoriscomposedofanarrayoflensesforwavefrontdivisionandtypicallyaCCDarraywithmultiplepixelsusedforspotposition(wavefronttilt)determination.哈特曼夏克Ifthatsourceisanextendedobject
8、,theshapeoftheobjectisconvolvedwiththesubaperturediffractionpatternonthequadcell.Intensityvariationcanseriouslydegrad
