Kusanthula Zolakwika za Dongosolo la Photodetector

Kusanthula Zolakwika za Dongosolo la Photodetector

Chiyambi cha Zinthu Zokhudza Zolakwika za Dongosolo muChowunikira zithunzi

Zinthu zofunika kuziganizira pa zolakwika za dongosolo ndi izi: 1. Kusankha zigawo:ma photodiode, ma amplifiers operational, resistors, capacitors, ADCs, power supply ics, ndi ma reference voltage sources. 2. Malo ogwirira ntchito: Mphamvu ya kutentha ndi chinyezi, ndi zina zotero. 3. Kudalirika kwa dongosolo: Kukhazikika kwa dongosolo, magwiridwe antchito a EMC.

Kusanthula Zolakwika za Dongosolo la Photodetectors

1. Photodiode: Mukuzindikira kwa photoelectricdongosolo, mphamvu ya ma photodiode pa zolakwika zadongosolo lamagetsiKuwonekera kwambiri m'mbali zotsatirazi:

(1) Kuzindikira (S)/ Kutsimikiza: Chiŵerengero cha chizindikiro chotulutsa (voltage/current) chikuwonjezeka △y ndi kuwonjezereka kwa input △x komwe kumayambitsa kuwonjezereka kwa kutulutsa △y. Ndiko kuti, s=△y/△x. Kuzindikira/kutsimikiza ndiye chinthu chachikulu chomwe chimapangitsa kuti sensor isankhe. Gawoli limawonekera makamaka mu mgwirizano wa ma photodiode monga mdima wamagetsi, komanso mu mawonekedwe enieni a ma photodetectors monga mphamvu yofanana ndi phokoso (NEP). Chifukwa chake, kusanthula kwakukulu kwa cholakwika chadongosolo kumafuna kuti sensitivity (S)/kutsimikiza kuyenera kukhala kokwera kuposa chofunikira chenicheni cha cholakwika kuti tikwaniritse zofunikira za cholakwika cha dongosolo lonse la photoelectric, chifukwa zotsatira za zolakwika zomwe zimayambitsidwa ndi zinthu zomwe zatchulidwa pambuyo pake ziyeneranso kuganiziridwa.

(2) Linearity (δL): Mlingo wa linearity wa ubale wochuluka pakati pa zotulutsa ndi zolowetsa za photodetector. yfs ndiye output yonse, ndipo △Lm ndiye maximum deviation of linearity. Izi zimaonekera makamaka mu linearity ndi linear saturation light power ya photodetector.

(3) Kukhazikika/Kubwerezabwereza: Chowunikira zithunzi chimakhala ndi kusalingana kwa zotsatira za zomwe zalowetsedwa mwachisawawa, zomwe ndi zolakwika mwachisawawa. Kupatuka kwakukulu kwa ma stroke a kutsogolo ndi kumbuyo kumaganiziridwa.

(4) Hysteresis: Chochitika chomwe ma curve a input-output a photodetector sakulumikizana panthawi yoyenda kutsogolo ndi kumbuyo.

(5) Kusinthasintha kwa kutentha: Mphamvu ya kusintha kulikonse kwa kutentha kwa 1℃ pa kusintha kwa kutulutsa kwa chowunikira cha photo. Kusinthasintha kwa kutentha kwa △Tm komwe kumachitika chifukwa cha kusinthasintha kwa kutentha kumawerengedwa kudzera mu kuwerengera kutentha kwa kutentha kwa malo ogwirira ntchito △T.

(6) Kusintha kwa nthawi: Chochitika chomwe kutulutsa kwa chowunikira zithunzi kumasintha pakapita nthawi pamene chosinthira cholowera sichinasinthe (zomwe zimayambitsa makamaka ndi kusintha kwa kapangidwe kake). Mphamvu yonse ya chowunikira zithunzi pa dongosolo imawerengedwa kudzera mu vekitala.

2. Ma amplifiers Ogwira Ntchito: Ma Parameter Ofunika Okhudza Cholakwika cha System Ma Amplifiers Ogwira Ntchito Ma Offset voltage Vos, Vos temperature drift, input offset current Ios, Ios temperature drift, input bias current Ib, input impedance, input capacitance, noise (input voltage noise, input current noise) Design gain thermal noise, power supply rejection ratio (PSRR), common-mode rejection ratio (CMR), open-loop gain (AoL), gain-bandwidth product (GBW), slew rate (SR), establishment time, total harmonic distortion.

Ngakhale kuti magawo a ma amplifier operational ndi ofunikira kwambiri pa dongosolo monga kusankha ma photodiode, chifukwa cha kuchepa kwa malo, matanthauzidwe enieni a magawo ndi mafotokozedwe sadzafotokozedwa pano. Pakupanga kwenikweni kwa ma photodetector, mphamvu ya magawo awa pa zolakwika za dongosolo iyenera kuyesedwa. Ngakhale kuti si magawo onse omwe angakhale ndi zotsatirapo zazikulu pa zosowa za polojekiti yanu, kutengera zochitika zenizeni za ntchito ndi zosowa zosiyanasiyana, magawo omwe ali pamwambapa adzakhala ndi zotsatira zosiyana pa zolakwika za dongosolo.

Pali magawo ambiri a ma amplifiers operational. Pa mitundu yosiyanasiyana ya ma signali, magawo akuluakulu omwe amayambitsa zolakwika za dongosolo amatha kuyang'ana kwambiri pa ma signali a DC ndi AC: ma signali osinthika a DC Voltage yolowera Vos, Vos temperature drift, input offset current Ios, input bias current Ib, input impedance, noise (input voltage noise, input current noise, design gain thermal noise), power supply rejection ratio (PSRR), common-mode rejection ratio (CMRR). Ac variation signal: Kuwonjezera pa ma parameter omwe ali pamwambapa, zotsatirazi ziyeneranso kuganiziridwa: input capacitance, open-loop gain (AoL), gain-bandwidth product (GBW), slew rate (SR), establishment time, and total harmonic distortion.