Yethula umkhawulokudonsa nesikhathi sokukhuphuka kwe-photodetector
Isikhathi somkhawulokudonsa kanye nesikhathi sokukhuphuka (esaziwa nangokuthi isikhathi sokuphendula) se-photodetector yizinto ezibalulekile ekuhlolweni komtshina wokubona. Abantu abaningi abanalo ulwazi ngalezi mingcele ezimbili. Lesi sihloko sizokwethula ngokuqondile umkhawulokudonsa kanye nesikhathi sokukhuphuka se-photodetector.
Isikhathi sokukhuphuka (τr) nesikhathi sokuwa (τf) zombili ziyizinkomba ezibalulekile zokulinganisa isivinini sokuphendula sezithonjana zezithombe. Umkhawulokudonsa we-3dB, njengenkomba kusizinda semvamisa, uhlobene eduze nesikhathi sokukhuphuka ngokuya ngesivinini sokuphendula. Ubudlelwano phakathi kwe-BW yomkhawulokudonsa we-photodetector nesikhathi saso sokuphendula i-Tr bungaguqulwa cishe ngefomula elandelayo: Tr=0.35/BW.
Isikhathi sokukhuphuka yigama kubuchwepheshe be-pulse, echaza futhi esho ukuthi isignali iphakama ukusuka endaweni eyodwa (imvamisa: I-Vout * 10%) iye kwelinye iphuzu (ngokuvamile: I-Vout * 90%). I-amplitude yonqenqema olukhuphukayo lwesiginali ye-Rise Time ngokuvamile ibhekisela esikhathini esithathwayo ukuze sikhuphuke sisuka ku-10% siye ku-90%. Isimiso sokuhlola: Isignali idluliselwa endleleni ethile, futhi elinye ikhanda lesampula lisetshenziselwa ukuthola nokukala inani le-voltage pulse ekugcineni okukude.
Isikhathi sokukhuphuka kwesignali sibalulekile ekuqondeni izindaba zobuqotho besignali. Iningi lezinkinga ezihlobene nokusebenza kohlelo lokusebenza lomkhiqizo ekwakhiweni kwama-photodetectors womkhawulokudonsa wesivinini esikhulu zihlotshaniswa nayo. Lapho ukhetha i-photodetector, kufanele inikezwe ukunakwa okwanele. Isikhathi sokukhuphuka sinomthelela omkhulu ekusebenzeni kwesifunda. Uma nje ingaphakathi kwebanga elithile, kufanele ithathwe ngokungathi sína, ngisho noma iwububanzi obungacacile kakhulu.
Njengoba isikhathi sokukhuphuka kwesignali sincipha, izinkinga ezifana nokuboniswa, ukuwela i-crosstalk, ukuwa kwe-orbit, imisebe ye-electromagnetic, kanye nokugxuma komhlaba okubangelwa isignali yangaphakathi noma isignali ephumayo yesithwebuli sesithombe ziba nzima kakhulu, futhi inkinga yomsindo iba nzima kakhulu ukuyixazulula. Ngokombono wokuhlaziywa kwe-spectral, ukuncishiswa kwesikhathi sokukhuphuka kwesignali kulingana nokwanda komkhawulokudonsa wesignali, okungukuthi, kunezingxenye eziningi ze-high-frequency esignali. Yilezi zingxenye ezinemvamisa ephezulu ezenza umklamo ube nzima. Izintambo zokuxhuma kumele zithathwe njengezintambo zokudlulisela, okuholele ezinkingeni eziningi ebezingekho ngaphambilini.
Ngakho-ke, ohlelweni lokufaka isicelo semishini yokuthwebula izithombe, kufanele ube nomqondo onjalo: lapho isignali yokuphumayo yesithwebuli sesithombe inonqenqema olukhuphukayo noma i-overshoot enzima, futhi isignali ingazinzile, kungenzeka kakhulu ukuthi isithwebuli sezithombe osithengile asihlangabezani nezidingo zomklamo ezifanele zobuqotho besignali futhi asikwazi ukuhlangabezana nezidingo zakho zangempela zohlelo lokusebenza ngokomkhawulokudonsa kanye nemingcele yesikhathi sokukhuphuka. Imikhiqizo yokubona ugesi we-JIMU Guangyan yonke isampula yama-chips akamuva athuthukile e-photoelectric, ama-chips asebenza ngesivinini esiphezulu amplifier, namasekhethi okuhlunga anembile. Ngokusho kwezimpawu zangempela zesignali yohlelo lokusebenza lwamakhasimende, zifanisa umkhawulokudonsa kanye nesikhathi sokukhuphuka. Isinyathelo ngasinye sicabangela ubuqotho besignali. Gwema izinkinga ezivamile ezifana nomsindo wesignali ephezulu kanye nokuzinza okubi okubangelwa ukungafani phakathi komkhawulokudonsa kanye nesikhathi sokukhuphuka ekusetshenzisweni kwama-photodetectors kubasebenzisi.
Isikhathi sokuthumela: Sep-29-2025