Menene PIN photodetector

Menene aPIN mai daukar hoto

Na'urar gano hoto daidai ne mai matukar kulawasemiconductor photonic na'urarwanda ke canza haske zuwa wutar lantarki ta hanyar amfani da tasirin photoelectric. Babban bangarensa shine photodiode (PD photodetector). Nau'in da aka fi sani shine ya ƙunshi mahaɗar PN, daidaitattun jagororin lantarki da harsashi na bututu. Yana da unidirectional conductivity. Lokacin da aka yi amfani da wutar lantarki na gaba, diode yana gudana; lokacin da aka yi amfani da wutar lantarki ta baya, diode yana yankewa. PD photodetector yayi kama da diode semiconductor na kowa, sai dai wannanPD photodetectoryana aiki ƙarƙashin wutar lantarki mai juyawa kuma ana iya fallasa shi. Ana tattara ta ta hanyar taga ko haɗin fiber na gani, yana ba da damar haske ya isa ga ɓangaren na'urar.

A halin yanzu, abin da aka fi amfani da shi a cikin PD photodetector ba shine haɗin PN ba amma haɗin PIN. Idan aka kwatanta da haɗin PN, haɗin PIN yana da ƙarin Layer I a tsakiya. Layer I Layer ne na nau'in semiconductor na nau'in N tare da ƙarancin adadin kuzari. Domin shi ne kusan Intrinsic semiconductor tare da ƙarancin maida hankali, ana kiran shi Layer I. Layer I yana da kauri sosai kuma kusan ya mamaye duk yankin da aka lalata. Yawancin photons da suka faru suna ɗauka a cikin Layer I kuma suna haifar da nau'i-nau'i-nau'i na electron (masu ɗaukar hoto). A ɓangarorin biyu na Layer I akwai nau'in P-type da N-type semiconductor tare da yawan adadin kuzari. Layukan P da N suna da sirara sosai, suna ɗaukar ƴan ɗimbin kaso na abubuwan da suka faru na photon da ke haifar da ƙaramin adadin masu ɗaukar hoto. Wannan tsarin zai iya haɓaka saurin amsawa na tasirin hoto. Koyaya, yanki mai faɗi da yawa zai tsawaita lokacin ɗimbin ɗimbin ɗaukar hoto a cikin yankin raguwa, wanda a maimakon haka yana haifar da martani a hankali. Sabili da haka, ya kamata a zaɓi nisa na yanki mai lalacewa. Ana iya canza saurin amsawar diode junction na PIN ta hanyar sarrafa faɗin yanki mai lalacewa.

PIN photodetector babban madaidaicin mai gano radiyo ne tare da ingantaccen ƙudurin kuzari da ingantaccen ganowa. Yana iya auna daidai nau'ikan nau'ikan makamashin radiation iri-iri da cimma saurin amsawa da babban aikin kwanciyar hankali. Aiki namai daukar hotoshine canza siginonin kalaman haske guda biyu bayan mitar bugun zuwa siginar lantarki, kawar da ƙarin ƙarar ƙarar hasken oscillator na gida, haɓaka siginar tsaka-tsaki, da haɓaka siginar-zuwa amo. Masu gano hoto na PIN suna da tsari mai sauƙi, sauƙin amfani, babban hankali, babban riba, babban bandwidth, ƙaramar amo, da ƙarfin hana tsangwama. Suna iya aiki a tsaye a wurare daban-daban masu tsauri kuma ana amfani da su musamman a cikin gano siginar lidar.