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1、—29—NewUVDetectorConceptsJEAN-FRANC¸OISHOCHEDEZUDOSCHUHLE¨RoyalObservatoryofBelgiumMax-Planck-Institutf¨urAeronomieBruxelles,BelgiumKatlenburg-Lindau,GermanyPHILIPPELEMAIREInstitutd'AstrophysiqueSpatialeOrsay,FranceBOLD(BlindtotheOpticalLightDetectors)isaninternati
2、onalinitiativededicatedtothedevelopmentofnovelimagingdetectorsforUVsolarobservations.Itreliesonthepropertiesofwide-bandgapsemiconductormaterials(inparticulardiamondandAl-Ga-nitrides).ThisinvestigationisproposedinviewoftheSolarOrbiterUVinstruments,forwhichtheexpecte
3、dbenefitsofthenewsensors,visibleblindnessandradiationhardness,willbehighlyvaluable.Despitevariousadvancesinthetechnologyofimagingdetectorsoverthelastfewdecades,thepresentUVimagersbasedonsiliconCCDsormicrochan-nelplatesexhibitlimitationswhichareinherenttotheiractualm
4、aterialandtechnology.Yettheutmostspatialresolution,fasttemporalcadence,sensitivity,andphotometricac-curacywillallbedecisiveforforthcomingsolarspacemissions.Theadventofimagersmadeoflargewide-bandgapsemiconductorswouldsurmountmanypresentweaknesses.Thiswouldopenupnews
5、cientificprospectsand,bysimplifyingtheirdesign,wouldevenmaketheinstrumentscheaper.AsfortheSolarOrbiter,theaspirationforwide-bandgapsemiconductor-basedUVdetectorsisstillmoredesirablebecausethespacecraftwillap-proachtheSunwhereheatandradiationfluxesarehigh.Wedescribeth
6、emotivationslead-ingtosuchnewdevelopments,andpresentaprogrammetoachieverevolutionaryflightcameraswithintheSolarOrbiterschedule.29.1MotivationsCurrentsolaratmosphericstudiesshowthattheneedforimprovedUVobservationsisparamount.Practically,theobservationaldatacanbeobtai
7、nedbyemphasizingapparentlyindepen-dentattributes:temporal,spectral,spatialresolutions,signal-to-noiseratio,fieldofview,etc.Scientificinvestigationsbenefitfromalloftheseaspects.However,theyarecoupledbythephysicalprocessestobeobserved.Forexample,smallerphenomenausuallyh
8、avelessbrightness,andevolvefaster.Thisimpliesthatthequestsforhighresolution,cadenceandsensitivityarefundamentallyindivisible,andthegoalwouldbetom
