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Adaptive Optics In Ground Based Telescopes Pdf Free

 
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MessagePosté le: Jeu 6 Oct - 03:29 (2016)    Sujet du message: Adaptive Optics In Ground Based Telescopes Pdf Free Répondre en citant




Adaptive Optics In Ground Based Telescopes Pdf Free > urlin.us/4fvgq










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Adaptive,,,optics,,,has,,,been,,,used,,,to,,,enhance,,,the,,,performance,,,of,,,free,,,space,,,optical,,,communication,,,systems[13],,,[14],,,and,,,to,,,control,,,the,,,spatial,,,output,,,of,,,optical,,,fibers.[15].,,,The,,LGS,,can,,then,,be,,used,,as,,a,,wavefront,,reference,,in,,the,,same,,way,,as,,a,,natural,,guide,,star,,except,,that,,(much,,fainter),,natural,,reference,,stars,,are,,still,,required,,for,,image,,position,,(tip/tilt),,information.,,The,,lasers,,are,,often,,pulsed,,,with,,measurement,,of,,the,,atmosphere,,being,,limited,,to,,a,,window,,occurring,,a,,few,,microseconds,,after,,the,,pulse,,has,,been,,launched.,,ESO.,,,This,needs,to,be,considered,if,a,good,beam,profile,is,to,be,achieved,in,laser,applications.,The,,light,,first,,hits,,a,,tiptilt,,(TT),,mirror,,and,,then,,a,,deformable,,mirror,,(DM),,which,,corrects,,the,,wavefront.,,This,,,laser,,,beam,,,can,,,then,,,be,,,used,,,as,,,a,,,guide,,,star,,,for,,,the,,,AO.,,,Military;,,,$3.5,,,Million,,,in,,,Funding,,,Provided,,,ASDNews".,,,==>,,,It,,,happens,,,because,,,they,,,are,,,extraordinarily,,,faint,,,and,,,to,,,compound,,,the,,,problem,,,,they,,,are,,,right,,,next,,,to,,,something,,,that,,,is,,,enormously,,,brighter,,,Slide,,,9,,,:,,,Conclusion,,,==>,,,There,,,are,,,many,,,substantial,,,technological,,,challenges,,,in,,,AO.,,,

Kindly,,,go,,,to,,,the,,,Home,,,Page,,,and,,,click,,,the,,,proper,,,topic..,,,The,actual,beam,is,measured,by,photo,diodes.,The,correction,of,these,aberrations,requires,continuous,,high-frequency,measurement,and,compensation.,doi:10.12942/lrsp-2011-2.,,,The,positions,of,these,spots,are,compared,with,the,positions,of,reference,spots,,and,the,displacements,between,the,two,are,used,to,determine,the,local,curvature,of,the,wavefrontan,estimate,of,the,phase,nonuniformities,causing,aberration.,Adaptive,,,optics,,,is,,,a,,,new,,,technology,,,which,,,is,,,being,,,used,,,now,,,a,,,days,,,in,,,ground,,,based,,,telescopes,,,to,,,remove,,,atmospheric,,,tremor,,,and,,,thus,,,provide,,,a,,,clearer,,,and,,,brighter,,,view,,,of,,,stars,,,seen,,,through,,,ground,,,based,,,telescopes.,,,This,allows,the,system,to,ignore,most,scattered,light,at,ground,level;,only,light,which,has,travelled,for,several,microseconds,high,up,into,the,atmosphere,and,back,is,actually,detected.,..,==>,,Also,,it,,emits,,light,,by,,virtue,,of,,its,,warmth,,,introducing,,thermal,,noise,,,further,,degrading,,the,,astronomers,,,ability,,to,,detect,,faint,,objects,,Slide,,7,,:,,What,,do,,we,,require?,,==>,,Figure,,Slide,,8,,:,,Other,,Stars,,,Other,,Earths,,==>,,Perhaps,,the,,most,,exciting,,scientific,,program,,to,,benefit,,from,,the,,new,,approach,,to,,adaptive,,optics,,will,,be,,to,,look,,at,,Jupiter,,like,,planets,,orbiting,,other,,stars.,,

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