Yambitsani bandwidth ndi nthawi yokwera ya photodetector

Yambitsani bandwidth ndi nthawi yokwera ya photodetector

Nthawi ya bandwidth ndi nthawi yokwera (yomwe imadziwikanso kuti nthawi yoyankha) ya photodetector ndi zinthu zofunika kwambiri pakuyesa kwa detector optical. Anthu ambiri sadziwa za magawo awiriwa. Nkhaniyi ifotokoza makamaka bandwidth ndi nthawi yokwera ya photodetector.

Nthawi yokwera ( τr ) ndi nthawi ya kugwa ( τf ) ndi zizindikiro zazikulu zoyezera kuthamanga kwa ma photodetectors. Kuthamanga kwa 3dB, monga chisonyezero mu chigawo chafupipafupi, chikugwirizana kwambiri ndi nthawi yowonjezereka malinga ndi liwiro la kuyankha. Ubale pakati pa bandwidth BW wa photodetector ndi nthawi yake yoyankhira Tr ikhoza kusinthidwa motsatira ndondomeko iyi: Tr = 0.35 / BW.

Kukwera nthawi ndi mawu mu teknoloji ya pulse, kufotokoza ndi kutanthauza kuti chizindikirocho chimatuluka kuchokera kumalo amodzi (kawirikawiri: Vout * 10%) kupita kumalo ena (nthawi zambiri: Vout * 90%). Kukula kwa m'mphepete kokwera kwa chizindikiro cha Rise Time nthawi zambiri kumatanthawuza nthawi yomwe imatengedwa kuti ikweze kuchokera pa 10% mpaka 90%. Mfundo yoyesera: Chizindikirocho chimaperekedwa m'njira inayake, ndipo mutu wina woyeserera umagwiritsidwa ntchito kupeza ndikuyeza kuchuluka kwa mphamvu yamagetsi kumapeto kwakutali.

Nthawi yokwera ya chizindikiro ndi yofunika kwambiri kuti timvetsetse nkhani za kukhulupirika kwa chizindikiro. Mavuto ambiri okhudzana ndi magwiridwe antchito azomwe amapanga pamapangidwe apamwamba kwambiri a bandwidth photodetectors amalumikizidwa nawo. Posankha photodetector, iyenera kupatsidwa chisamaliro chokwanira. Nthawi yowonjezereka imakhudza kwambiri kayendedwe ka dera. Malingana ngati ili m'gulu linalake, iyenera kutengedwa mozama, ngakhale itakhala yosadziwika bwino.

Pamene nthawi yokwera chizindikiro ikucheperachepera, mavuto monga kuwunikira, crosstalk, kugwa kwa orbit, ma radiation a electromagnetic, ndi kutsika kwapansi komwe kumachitika chifukwa cha siginecha yamkati kapena chizindikiro chotuluka cha photodetector chimakula kwambiri, ndipo vuto laphokoso limakhala lovuta kulithetsa. Kuchokera pamawonedwe a spectral kusanthula, kuchepetsa nthawi ya kukwera kwa chizindikiro kumakhala kofanana ndi kuwonjezeka kwa bandwidth ya chizindikiro, ndiko kuti, pali zigawo zambiri zamtundu wapamwamba mu chizindikiro. Ndi ndendende zigawo zapamwambazi zomwe zimapangitsa kuti mapangidwewo akhale ovuta. Mizere yolumikizira iyenera kutengedwa ngati mizere yopatsirana, zomwe zadzetsa mavuto ambiri omwe sanakhalepo kale.

Chifukwa chake, mukamagwiritsira ntchito ma photodetectors, muyenera kukhala ndi lingaliro lotere: pamene chizindikiro chotuluka cha photodetector chili ndi mapiri okwera kwambiri kapena ngakhale kuphulika kwakukulu, ndipo chizindikirocho sichikhazikika, ndizotheka kuti chithunzithunzi chomwe mwagula sichikukwaniritsa zofunikira za mapangidwe a kukhulupirika kwa chizindikiro ndipo simungathe kukwaniritsa zofunikira zanu zenizeni zokhudzana ndi bandwidth ndi nthawi yokwera. Zida zojambulira zithunzi za JIMU Guangyan zonse zimatengera tchipisi taposachedwa kwambiri zamtundu wazithunzi, tchipisi tambiri tambiri ta amplifier, ndi mabwalo olondola. Malinga ndi mawonekedwe enieni ogwiritsira ntchito makasitomala, amafanana ndi bandwidth ndi nthawi yowuka. Gawo lililonse limaganizira kukhulupirika kwa chizindikirocho. Pewani zovuta zodziwika bwino monga phokoso lalikulu la ma siginecha komanso kusakhazikika kosasunthika komwe kumachitika chifukwa cha kusagwirizana pakati pa bandwidth ndi nthawi yokwera pakugwiritsa ntchito ma photodetectors kwa ogwiritsa ntchito.