I-Optics yekhamera yedijithali ye-Large Synoptic Survey Telescope ishiya i-LLNL ilungele ukuhlanganiswa.
Umsebenzi omkhulu: ilensi enkulu kakhulu yekhamera yedijithali enkulu kakhulu.
Ilensi elinganisa amamitha ayi-1.57 ngaphesheya futhi kucatshangwa ukuthi iyilensi ephezulu kakhulu yokusebenza eyake yakhiwa selifikile I-SLAC National Accelerator Laboratory, okuyisinyathelo esikhulu maqondana nokugcina lapho iya khona kukhamera yedijithali esetshenziswa yi-Large Synoptic Survey Telescope (LSST).
Umhlangano ophelele welensi yekhamera, kufaka phakathi ilensi enkulu ye-L1 kanye nomlingani omncane weL2 lens elinganisa amamitha ayi-1.2 ububanzi, yenzelwe iLawrence Livermore National Laboratory (LLNL) futhi yakhiwe ngaphezu kweminyaka emihlanu nge I-Ball Aerospace nosonkontileka abancane Izinhlelo ze-Arizona Optical. Ilensi yesithathu, engu-L3, 72 amasentimitha ububanzi, nayo izothunyelwa kwi-SLAC kungakapheli nenyanga.
I-SLAC ilawula ukwakheka okuphelele, ubuqili kanye nomhlangano wokugcina wekhamera yedijithali ye-LSST eyi- $ 168 million, 3,200-megapixel digital, okuthiwa manje seyiqediwe ngamaphesenti angama-90 futhi izophela ekuqaleni kuka-2021.
"Ukuphumelela kokuqanjwa kwalo mhlangano oyingqayizivele we-optical kufakazela ubuchwepheshe be-LLNL obuhamba phambili emhlabeni ku-optics enkulu, okwakhiwe kumashumi eminyaka wesipiliyoni ekwakhiweni kwezinhlelo ze-laser ezinkulu nezinamandla kakhulu emhlabeni," kusho uScot Olivier, ubambe iqhaza kuphrojekthi ye-LSST kaLawrence Livermore isikhathi esingaphezu kweminyaka eyishumi.
Ngokusho kwe-LSST Corporation, ikhamera edijithali ku-LSST iyikhamera yedijithali enkulu kunazo zonke ezake zakhiwa. Isakhiwo sokugcina sizolinganisa u-1.65 x 3 metres nesisindo esingu-2,800 kg. Kungumfanekiso omkhulu ovulekile, obanzi obanzi obukwazi ukubuka ukukhanya kusuka ku-ultraviolet eseduze kuya kufoni ye-infrared.
Lapho zihlanganisiwe, amalensi e-L1 ne-L2 azohlala esakhiweni se-optics ngaphambili komzimba wekhamera; I-L3 izokwakha iwindi lokungena le-cryostat yekhamera, equkethe indiza yayo egxile kanye ne-electronics ehambisanayo.
Izidingo eziqondile zokugxila
The Ikhamera yedijithali ye-CCD izorekhoda izithombe ezibonwe uhlelo olukhulu lwe-telescope, uqobo lwayo a ukwakheka kwezibuko ezintathukuhlanganiswa izibuko zamabanga aphansi eziyimitha engu-8.4, amamitha angu-3.4 amasekondi namamitha ayi-5 emfundo ephakeme. Ukukhanya kokuqala ku-LSST kulindeleke ku-2020, ngokusebenza okugcwele okuzoqala ngo-2022.
Ukuklama ikhamera yedijithali ekwazi ukuhlangabezana nezinhloso ze-LSST zokuzicabangela okuholele ekutheni i-LLNL ibhekane nezinselelo eziningi, ngokusho kwethimba lephrojekthi. Uhlobo lokugcina lomtshina lusebenzisa umdwebo womtshina we-silicon we-189 16-megapixel ohlelwe ku-“rafts” ezingama-21 ukunikela ngesixazululo esiphelele esingu-3.2 gigapixels.
Ikhamera izothatha ukuvezwa kwemizuzwana engu-15 njalo ngemizuzwana engama-20, isibonakude siphinde sigcwaliswe futhi sihlale ngaphakathi kwemizuzwana emihlanu, sidinga isakhiwo esifushane futhi esiqinile. Lokhu kusho ukuthi inombolo encane kakhulu f, kanye nokugxila okunembile kwekhamera.
Imibhalo ye-LSST ikhombisa ukuthi ukuvezwa kwamasekhondi ayi-15 kungukuyekethisa ukuvumela ukubona zombili imithombo edangele nehambayo. Ukudalulwa okude kuzonciphisa ngaphezulu kokufundwa kwamakhamera nokubekwa kabusha kwe-telescope, kuvumela ukucabanga okujulile, kepha izinto ezihamba ngokushesha neziseduze noMhlaba zizohamba kakhulu ngesikhathi sokuvezwa. Indawo ngayinye esibhakabhakeni kufanele ibonwe ngokuvezwa okuningana kwe-15 kwesibili, ukwenqaba ukushaywa kwama-cosmic ray kuma-CCDs.
"Noma nini lapho wenza umsebenzi okokuqala ngqa, kuzoba nezinselelo, futhi ukukhiqizwa kwelensi ye-LSST L1 kubonakale kungehlukile," kuphawula uJustin Wolfe we-LLNL. “Usebenza nocezu lwengilazi olungaphezu kwamamitha amahlanu ububanzi futhi lungamasentimitha amane kuphela ubukhulu. Noma ikuphi ukuphatha kabi, ukushaqeka noma ingozi kungaholela ekonakaleni kwelensi. Ilensi iwumsebenzi wobuciko futhi sonke siziqhenya ngayo. ”
Isikhathi Iposi: Oct-31-2019