22/06/01Umsinga omnyamangumthombo wengxolo yekhamera exhomekeke kwiqondo lobushushu kunye ne-exposure-time, elinganiswa ngee-electron nge-pixel nganye, ngesekhondi nganye yexesha lokuvezwa. Kusetyenziso olusebenzisa amaxesha okuvezwa angaphantsi kwesekondi enye, kunye nobumnyama bangoku obungaphantsi kwe-1e-/p/s, bunokungahoywa kwizibalo zophawu-kwingxolo-ubungakanani.
Umzekelo, kwixabiso langoku elimnyama le-0.001 e/p/s, amaxesha okuvezwa kwe-1ms okanye i-60 imizuzwana omabini akhokelela kwigalelo lengxolo engabalulekanga, apho ixabiso lengxolo linikezelwa ngexabiso langoku elimnyama liphindaphindwe lixesha lokuvezwa, konke phantsi kwengcambu. Nangona kunjalo, ikhamera eyahlukileyo ene-2e-/p/s kwi-60s exposure iya kuba negalelo eyongezelelweyo √120 = 11e- yengxolo yangoku emnyama, enokuthi ibaluleke kakhulu kunengxolo efundwayo kumanqanaba okukhanya aphantsi. Sekunjalo, kwi-1ms exposure, nalo mgangatho uphakamileyo wangoku omnyama awusayi kuhoywa.
Umzobo 1: Umfanekiso we-1 (a) uvela kwikhamera ye-CMOS epholileyo yaseTucsenFL 20BWukuba umbane omnyama uphantsi njenge-0.001e/pixel/s. Umzobo 1(b) ubonisa ukuba uMfanekiso 1(a) unawoa imvelaphi ebalaseleyo leyoaNdiphantse ndakhuseleka kwingxolo yangoku emnyama nangona ixesha lokuvezwa lilide kangange-10s.
Ingxolo yangoku emnyama ibangelwa yintshukumo ye-thermal yee-electron ngaphakathi kwe-sensor yekhamera. Zonke iiathom zifumana intshukumo ye-thermal vibrational, kwaye ngamanye amaxesha i-electron inokuthi 'ixhume' iphume kwi-substrate yesivamvo sekhamera iye kwiqula le-pixel apho ii-photoelectrons ezichongiweyo zigcinwa khona. Akunakwenzeka ukwahlula phakathi kwezi electron 'ze-thermal' kunye nee-electron eziye zavela ngokufunyanwa ngempumelelo kwefotoni. Ngexesha lokuvezwa komfanekiso, ezi electron zinokwakha, zibe negalelo kumqondiso wangoku obumnyama. Nangona kunjalo, inani elichanekileyo leelektroni alikhethi, likhokelela kwigalelo lengxolo yangoku emnyama. Ekupheleni kokuvezwa, zonke iintlawulo ziyalinganiswa zicinywe kwi-pixel elungele ukuvezwa okulandelayo.
Ingxolo yangoku emnyama ixhomekeke kwiqondo lobushushu, kodwa ikwaxhomekeke kakhulu kuyilo lwesivamvo sekhamera kunye nolwakhiwo kunye nekhamera ye-elektroniki, ngoko inokwahluka kakhulu ukusuka kwikhamera ukuya kwikhamera kwiqondo lobushushu elifanayo.
Ingaba umsinga omnyama osezantsi ubalulekile kumfanekiso wam?Nokuba ixabiso elinikiweyo elimnyama langoku liya kuba negalelo elikhulu kumlinganiselo wemifanekiso yakho ukuya kwingxolo kunye nomgangatho womfanekiso uxhomekeke ngokupheleleyo kwimeko yakho yokucinga.
Kwimizobo yokukhanya okuphezulu kunye namawaka eefotoni ngepikseli nganye emva kokuvezwa kwekhamera, ubumnyama bangoku akunakwenzeka ukuba bubaluleke kakhulu kumgangatho womfanekiso ngaphandle kokuba kuvezwe.mii-es zinde kakhulu (amashumi emizuzwana ukuya kwimizuzu) njengakwi-astronomy applications.
Umzobo 2: Ingcebiso yekhamera yexesha elide yaseTucsen
