Izinto eziphambili zeifotodetectoruvavanyo
Ixesha le-bandwidth kunye nexesha lokunyuka (ekwabizwa ngokuba lixesha lokuphendula) le-photodetectors, njengezinto eziphambili kuvavanyo lwee-detectors, okwangoku zitsale ingqalelo yabaphandi abaninzi be-optoelectronic. Nangona kunjalo, umbhali ufumanise ukuba abantu abaninzi abaqondi ezi parameters zimbini kwaphela. Namhlanje, i-JIMu Optoresearch izakwazisa ngokuthe ngqo i-bandwidth kunye nokunyuka kwexesha leefoto zokubona wonke umntu.
Kwinqaku elidlulileyo malunga nokukhethwa kweeparamitha eziphambili zeiifotodiodes, sazisa ukuba zombini ixesha lokunyuka ( τr) kunye nexesha lokuwa ( τf ) zizalathisi eziphambili zokulinganisa isantya sokuphendula se-photodetectors. I-3dB bandwidth, njengesalathisi kwi-domain frequency, ihambelana ngokusondeleyo nexesha lokunyuka ngokwesantya sokuphendula. Ubudlelwane phakathi kwe-bandwidth ye-BW ye-photodetector kunye nexesha layo lokuphendula i-Tr inokuguqulwa ngokukhawuleza ngolu hlobo lulandelayo: Tr = 0.35 / BW.
Ixesha lokunyuka ligama kwi-teknoloji ye-pulse, ichaza kunye nentsingiselo yokuba isignali iphakama ukusuka kwelinye iphuzu (ngokuqhelekileyo: I-Vout * 10%) ukuya kwelinye iphuzu (ngokuqhelekileyo: Vout * 90%). I-amplitude yecala elikhulayo le-Rise Time signal ibhekisela ngokubanzi kwixesha elithathiweyo ukunyuka ukusuka kwi-10% ukuya kwi-90%. Umgaqo wovavanyo: Isiginali ihanjiswa ecaleni kwendlela ethile, kwaye enye intloko yesampulu isetyenziselwa ukufumana nokulinganisa ixabiso le-voltage pulse ekupheleni okude.
Ixesha lokunyuka komqondiso libalulekile ekuqondeni imiba yemfezeko yomqondiso. Uninzi lweengxaki ezinxulumene nokusebenza kwesicelo semveliso kuyilo lwei-photodetector enesantya esiphezuluzihambelana nayo. Xa ukhetha i-photodetector, kufuneka uhlawule ngokwaneleyo. Kubalulekile ukuba siseke ingcamango yokuba ixesha lokunyuka linempembelelo enkulu ekusebenzeni kwesekethe. Logama nje ikuluhlu oluthile, kufuneka ithathelwe ingqalelo, nokuba luhlobo olungacacanga kakhulu. Akukho mfuneko yokuchaza ngokuchanekileyo lo mgangatho woluhlu, kwaye awunakubaluleka okusebenzayo. Khawukhumbule ukuba iteknoloji yokucubungula i-chip yangoku yenze eli xesha lifutshane kakhulu, lifikelela kwinqanaba le-ps. Lixesha lokuba unikele ingqalelo kwimpembelelo yayo.
Njengoko ixesha lokunyuka komqondiso lincipha, iingxaki ezinje nge-reflection, crosstalk, ukuwohloka kwe-orbit, imitha ye-electromagnetic, kunye ne-bounce yomhlaba ebangelwa ngumqondiso wangaphakathi okanye isignali yemveliso ye-photodetector ibe nzima ngakumbi, kwaye ingxaki yengxolo iba nzima ukuyicombulula. Ukususela kumbono wokuhlalutya kwe-spectral, ukunciphisa ixesha lokunyuka kwesignali lilingana nokunyuka kwe-bandwidth yesignali, oko kukuthi, kukho amacandelo aphezulu aphezulu kwi-signal. Yiyo kanye la macandelo aphezulu-frequency eyenza uyilo lube nzima. Iintambo zoqhagamshelo kufuneka zithathwe njengeentambo zothumelo, nto leyo ekhokelele kwiingxaki ezininzi ebezingekho ngaphambili.
Ngoko ke, kwinkqubo yesicelo se-photodetectors, kufuneka ube nombono onjalo: xa isignali yesiphumo se-photodetector inomda onyukayo okanye i-overshoot enzima kakhulu, kwaye isibonakaliso asizinzile, kunokwenzeka ukuba i-photodetector oyithengileyo ayihlangabezani neemfuno zoyilo olufanelekileyo lwengqibelelo yomqondiso kwaye ayikwazi ukuhlangabezana neemfuno zakho zesicelo ngokwemiqathango ye-bandwidth kunye nokunyuka kwexesha. Iimveliso ze-photoelectric detector ye-JIMU Guangyan zonke iisampulu zeetshiphusi zombane zamva nje, iitshiphusi zeamplifier ezisebenza ngesantya esiphezulu, kunye neesekethe ezichanekileyo zokucoca. Ngokweempawu zeempawu zesicelo zabathengi, zihambelana ne-bandwidth kunye nexesha lokunyuka. Inyathelo ngalinye lithathela ingqalelo ukuthembeka komqondiso. Gwema iingxaki eziqhelekileyo ezifana nengxolo ephezulu yesignali kunye nokuzinza okungahambi kakuhle okubangelwa ukungalingani phakathi kwe-bandwidth kunye nexesha lokunyuka kwisicelo se-photodetectors kubasebenzisi.
Ixesha lokuposa: Sep-15-2025