Ukuhlaziywa Kwamaphutha Esistimu Ye-Photodetector

Ukuhlaziywa Kwamaphutha Esistimu Ye-Photodetector

Isingeniso Sezici Ezithonya Amaphutha Esistimu kuIsitholi sezithombe

Izinto ezicatshangelwayo mayelana nephutha elihlelekile zifaka: 1. Ukukhethwa kwezingxenye:ama-photodiode, ama-amplifier okusebenza, ama-resistor, ama-capacitor, ama-ADC, ama-ics okunikezwa kwamandla, kanye nemithombo ye-voltage yokubhekisela. 2. Indawo yokusebenza: Ithonya lokushisa kanye nomswakama, njll. 3. Ukuthembeka kwesistimu: Ukuqina kwesistimu, ukusebenza kwe-EMC.

Ukuhlaziywa Kwephutha Lesistimu Yama-Photodetector

1. I-Photodiode: Ku-ukutholwa kwe-photoelectricuhlelo, ithonya lama-photodiode emaphutheni e-uhlelo lwe-photoelectrickubonakala kakhulu kulezi zici ezilandelayo:

(1) Ukuzwela (S)/ Isixazululo: Isilinganiso sokwanda kwesignali yokukhipha (i-voltage/current) △y nokwanda kokufaka △x okubangela ukwanda kokukhipha △y. Okungukuthi, s=△y/△x. Ukuzwela/isixazululo yisimo esiyinhloko sokukhethwa kwenzwa. Le pharamitha ibonakala ngokuqondile ekuxhumaneni okuqondile kwama-photodiode njengogesi omnyama, kanye nasekubonakalisweni okuqondile kwama-photodetector njengamandla alinganayo nomsindo (NEP). Ngakho-ke, ukuhlaziywa okuyisisekelo kakhulu kwephutha elihlelekile kudinga ukuthi ukuzwela (S)/isixazululo kumele kube phezulu kunemfuneko yangempela yephutha ukuze kuhlangatshezwane nezidingo zephutha zesistimu yonke ye-photoelectric, njengoba umthelela wephutha obangelwa yizici ezishiwo kamuva nawo udinga ukucatshangelwa.

(2) Umugqa (δL): Izinga lomugqa wobudlelwano obunobungako phakathi kokukhiphayo nokufakwayo kwe-photodetector. I-yfs ingumphumela ogcwele, kanti i-△Lm ingukuphambuka okuphezulu komugqa. Lokhu kubonakala ngqo emandleni okukhanya okuqondile kanye nokugcwala okuqondile kwe-photodetector.

(3) Ukuzinza/Ukuphindaphinda: I-photodetector inokungahambisani kokukhipha kokufaka okungahleliwe okufanayo, okuyiphutha elingahleliwe. Kucatshangelwa ukuphambuka okuphezulu kokushaya phambili nokubuyela emuva.

(4) I-Hysteresis: Isenzakalo lapho amajika abonisa khona okufakwayo-okukhiphayo kwe-photodetector engahlangani khona ngesikhathi sokuhamba kwayo phambili nangemuva.

(5) Ukukhukhuleka kwezinga lokushisa: Ithonya lokushintsha ngakunye kwezinga lokushisa elingu-1℃ ekushintsheni kokukhishwa kwe-photodetector. Ukuphambuka kokukhukhuleka kwezinga lokushisa △Tm okubangelwa ukukhukhuleka kwezinga lokushisa kubalwa ngokubalwa kokukhukhuleka kwezinga lokushisa kwebanga lokushisa lendawo yokusebenza △T.

(6) Ukushintsha kwesikhathi: Isenzakalo lapho umphumela we-photodetector ushintsha ngokuhamba kwesikhathi lapho i-input variable ihlala ingashintshi (izimbangela zibangelwa kakhulu izinguquko esakhiweni sayo sokwakheka). Ithonya eliphelele lokuphambuka kwe-photodetector ohlelweni libalwa nge-vector sum.

2. Ama-amplifier okusebenza: Amapharamitha Ayinhloko Athinta Iphutha Lesistimu Ama-amplifier Okusebenza I-Vos ye-offset voltage, i-Vos temperature drift, i-input offset current Ios, i-Ios temperature drift, i-input bias current Ib, i-input impedance, i-input capacitance, umsindo (umsindo we-input voltage, umsindo wamanje wokufaka) Umsindo wokushisa we-gain design, isilinganiso sokwenqatshwa kokunikezwa kwamandla (PSRR), isilinganiso sokwenqatshwa kwemodi evamile (CMR), i-open-loop gain (AoL), umkhiqizo we-gain-bandwidth (GBW), izinga lokushaya (SR), isikhathi sokusungulwa, ukuhlanekezelwa okuphelele kwe-harmonic.

Nakuba amapharamitha ama-amplifier okusebenza ebaluleke kakhulu njengengxenye yesistimu njengokukhethwa kwama-photodiode, ngenxa yokulinganiselwa kwesikhala, izincazelo zepharamitha ezithile kanye nezincazelo ngeke zichazwe lapha. Ekwakhiweni kwangempela kwama-photodetector, ithonya lala mapharamitha emaphutheni ahlelekile kufanele lihlolwe. Nakuba kungewona wonke amapharamitha angaba nomthelela omkhulu ezidingweni zephrojekthi yakho, kuye ngezimo zangempela zohlelo lokusebenza kanye nezidingo ezahlukene, amapharamitha angenhla azoba nemiphumela ehlukile emaphutheni ahlelekile.

Kunemingcele eminingi yama-amplifier okusebenza. Ngezinhlobo ezahlukene zesignali, amapharamitha ayinhloko abangela amaphutha esistimu angagxila kumasignali e-DC ne-AC: Izimpawu eziguquguqukayo ze-DC I-Vos, i-Vos temperature drift, i-input offset current Ios, i-input bias current Ib, i-input impedance, umsindo (umsindo we-input voltage, umsindo wamanje wokufaka, umsindo wokushisa wokuthola umklamo), isilinganiso sokwenqatshwa kokunikezwa kwamandla (PSRR), isilinganiso sokwenqatshwa kwemodi evamile (CMRR). Isignali yokuguquguquka kwe-Ac: Ngaphezu kwamapharamitha angenhla, okulandelayo nakho kudingeka kucatshangelwe: i-input capacitance, i-open-loop gain (AoL), umkhiqizo we-gain-bandwidth (GBW), izinga lokushaya (SR), isikhathi sokusungulwa, kanye nokuphambuka okuphelele kwe-harmonic.