Binciken Kurakurai na Tsarin Photodetector

Binciken Kurakurai na Tsarin Photodetector

I. Gabatarwa ga Abubuwan Tasirin Kurakuran Tsarin a cikiMai daukar hoto

Takamaiman la'akari don kuskuren tsari sun haɗa da: 1. Zaɓin ɓangaren:photodiodes, Amplifiers masu aiki, resistors, capacitors, ADCs, ics na wutar lantarki, da maɓuɓɓugan wutar lantarki. 2. Yanayin aiki: Tasirin zafin jiki da zafi, da dai sauransu 3. Amintaccen tsarin: Tsarin tsarin, aikin EMC.

Ii. Nazari Kuskuren Tsari na Masu Binciken Hoto

1. Photodiode: Agano wutar lantarkitsarin, tasirin photodiodes akan kurakurai natsarin photoelectrican fi bayyana shi ta fuskoki masu zuwa:

(1) Sensitivity (S)/ Resolution: Matsakaicin siginar fitarwa (voltage/current) increment △ y zuwa ƙarar shigarwa △ x wanda ke haifar da haɓakar fitarwa △ y. Wato s=△y/△x. Hankali/ƙuduri shine yanayin farko don zaɓin firikwensin. Wannan siga yana bayyana musamman a cikin haɗin kai tsaye na photodiodes azaman duhu na halin yanzu, kuma a cikin takamaiman bayyanuwar masu gano hoto azaman ƙarfin amo daidai (NEP). Sabili da haka, mafi mahimmancin bincike na kuskuren tsari yana buƙatar cewa hankali (S) / ƙuduri dole ne ya zama mafi girma fiye da ainihin kuskuren da ake bukata don saduwa da bukatun kuskuren dukkanin tsarin photoelectric, kamar yadda tasirin kuskuren ya haifar da abubuwan da aka ambata daga baya kuma yana buƙatar la'akari.

(2) Linearity (δL): Matsayin layin layi na alaƙar ƙididdiga tsakanin fitarwa da shigar da mai daukar hoto. yfs shine cikakken fitarwa, kuma △ Lm shine mafi girman karkatar da layi. Ana bayyana wannan musamman a cikin layi da ikon jikewar haske na na'urar gano hoto.

(3) Kwanciyar hankali/ Maimaituwa: Mai gano hoto yana da rashin daidaituwar fitarwa don shigarwar bazuwar iri ɗaya, wanda shine kuskuren bazuwar. Ana la'akari da iyakar karkatar da bugun gaba da baya.

(4) Hysteresis: Lamarin da ke nuna halayen shigar-fitarwa na na'urar gano hoto ba ta yin karo da juna yayin tafiyarsa ta gaba da baya.

(5) Zazzabi drift: Tasirin kowane 1 ℃ canji a zazzabi a kan fitarwa canji na photodetector. Ana ƙididdige karkatar da yanayin zafin jiki △Tm wanda ke haifar da ɗigon zafin jiki ta hanyar lissafin yanayin zafin yanayin aiki △T.

(6) Guduwar lokaci: Al'amarin da fitowar na'urar daukar hoto ke canzawa a kan lokaci lokacin da ma'aunin shigar da bayanai ya kasance ba canzawa (sababbun galibin su ne saboda canje-canje a tsarin tsarin nasa). Ana ƙididdige cikakken tasirin karkatar da hoto akan tsarin ta hanyar jimlar vector.

2. Ayyukan amplifiers: Maɓallin Maɓallin Maɓallin Tsarin Tsarin Kuskuren Ayyuka Ayyukan Amplifiers Kashe ƙarfin lantarki Vos, Vos zafin jiki drift, shigar da biya na yanzu Ios, Ios zafin jiki drift, shigar da son rai halin yanzu Ib, shigar da impedance, shigar da capacitance, amo (shigar da ƙarfin lantarki amo, shigar da halin yanzu amo) Design samu thermal amo, ikon samar da rashi (PSRRjection reshe), MRRC rashi na gama gari (PSRRjection reshe). ribar buɗaɗɗen madauki (AoL), samfur ɗin riba-bandwidth (GBW), ƙimar kashewa (SR), lokacin kafawa, jimillar murdiya.

Kodayake ma'auni na amplifiers masu aiki suna da mahimmancin tsarin tsarin kamar zaɓi na photodiodes, saboda iyakokin sararin samaniya, ƙayyadaddun ma'anar ma'auni da kwatance ba za a yi karin bayani a nan ba. A cikin ainihin ƙirar masu binciken hoto, tasirin waɗannan sigogi akan kurakurai na tsari yakamata a kimanta su duka. Ko da yake ba duka sigogi na iya yin tasiri mai mahimmanci akan buƙatun aikinku ba, dangane da ainihin yanayin aikace-aikacen da buƙatu daban-daban, sigogin da ke sama zasu sami tasiri daban-daban akan kurakurai na tsari.

Akwai sigogi da yawa don amplifiers masu aiki. Don nau'ikan sigina daban-daban, manyan sigogin da ke haifar da kurakurai na tsarin za a iya mai da hankali kan siginar DC da AC: siginar siginar DC masu canzawa Input soket volt Vos, Vos zafin jiki drift, shigar da diyya halin yanzu Ios, shigar da son rai halin yanzu Ib, shigar da impedance, amo (shigar da ƙarfin lantarki amo, shigar da halin yanzu amo, ƙira samu thermal amo), ikon samar da rejection rabo (PSRR), gama-gari-mo rabo. Siginar bambancin AC: Baya ga sigogin da ke sama, ana buƙatar la'akari da waɗannan masu zuwa: ƙarfin shigarwa, riba mai buɗewa (AoL), samfurin bandwidth riba (GBW), ƙimar kashe (SR), lokacin kafawa, da jimillar murdiya.