简介：Anewscreen-spotimagingmethodbasedonopticalmeasurementisproposed,whichisapplicabletotheclose-rangemeasurementofaircraft'sthree-dimensional(3D)attitudeparameters.Lasertrackerisusedtofinishtheglobalcalibrationsofthehigh-speedcamerasandthefixedscreensontestsite,aswellastoestablishmedia-coordinate-framesamongvariouscoordinatesystems.Thelasercooperationobjectmountedontheaircraftsurfaceprojectslaserbeamsonthescreensandthehigh-speedcamerassyn-chronouslyrecordthelight-spots'positionchangingwithaircraftattitude.Therecordedimagesequencesareusedtocomputetheaircraftattitudeparameters.Basedonthematrixanalysis,theerrorsourcesofthemeasurementaccuracyareanalyzed,andthemaximumrelativeerrorofthismathematicalmodelisestimated.Theexperimentalresultshowsthatthismethodeffectivelymakesthechangeofaircraftpositiondistinguishable,andtheerrorofthismethodisnomorethan3′whiletherotationanglesofthreeaxesarewithinacertainrange.

简介：Influencesofthescatteringphasefunctionsonspatiallyresolveddiffusereflectancefromahomogenoussemi-infinitemediumclosetosourcearestudiedwithMonteCarlosimulation.Itisshownthattheinfluencesofopticalparametershigherthanthesecondorderonthediffusereflectancearequiteweakintheregionfrom0.3toseveraltransportmeanfreepatheswhenHenyey-Greensteinphasefunctionoracombinedphasefunctionoftwoparametersareused.ButthisinfluencemaybesubstantialifthedoubleHenyey-Greensteinfunctionisusedtodescribethescatteringpropertyoftissue.