Cov yam ntxwv ntawm qhov kub thiab txias ntawm Avalanche Photodetector

Cov yam ntxwv ntawm qhov kub thiab txias ntawmAvalanche Photodetector
Cov duab diodes avalanche (APD Photodetector) nyob hauv ib txoj haujlwm tseem ceeb hauv cov teb tsis muaj zog ntawm kev tshawb nrhiav teeb liab xws li laser ranging, lidar, optical time domain reflectometry, thiab quantum communication vim lawv qhov nce siab thiab rhiab heev. Txawm li cas los xij, kev ua tau zoo ntawm APD Photodetector, tshwj xeeb tshaj yog nws qhov nce avalanche (M) thiab breakdown voltage (Vbr), yog qhov yooj yim rau kev hloov pauv ntawm qhov kub thiab txias. Qhov kub thiab txias no yuav cuam tshuam rau qhov ruaj khov thiab kev ntsuas qhov tseeb ntawm lub system. Tsab xov xwm no tshuaj xyuas lub cev ntawmCov duab diodes avalanchekev hloov pauv ntawm qhov kub thiab txias, sau cov kev cai ntawm nws cov kev ntsuas tseem ceeb hloov pauv nrog qhov kub thiab txias, thiab qhia txog cov txheej txheem them nyiaj uas siv ntau xws li cov voj voog them nyiaj kub, kev hloov kho qhov tsis sib xws, thiab kev tswj qhov kub.
1. Lub cev nqaij daim tawv ntawm qhov kub thiab txias hloov pauv hauv Avalanche Photodetector
Cov yam ntxwv kub ntawm APDLub tshuab ntes duabfeem ntau yog txiav txim siab los ntawm lub tshuab tawg ntawm cov neeg nqa khoom hauv cov khoom siv semiconductor. Thaum siv qhov kev cuam tshuam rov qab siab, cov neeg nqa khoom raug nrawm los ntawm lub zog hluav taws xob kom tau txais lub zog kinetic, thiab sib tsoo thiab ionize nrog cov lattice atoms, tsim cov khub electron qhov tshiab thiab tsim cov avalanche multiplication. Thaum qhov kub nce ntxiv, lattice vibrations (phonon scattering) ua kom muaj zog, thiab txoj kev dawb nruab nrab ntawm cov neeg nqa khoom ntawm ob qhov kev sib tsoo luv dua. Qhov no txhais tau tias cov neeg nqa khoom nyuaj dua los sau cov zog txaus los ua rau ionization, ua rau cov coefficients ionization txo qis (α thiab β).
2. Kev Taw Qhia Txog Cov Yam Ntxwv Kub ntawm Avalanche Photodetector
APD siv cov nyhuv avalanche multiplication sab hauv kom ua tiav qhov rhiab heev, tab sis nws qhov nce siab yog rhiab heev rau qhov kub thiab txias. Thaum qhov kub nce, kev co ntawm lattice (phonon scattering) nce ntxiv, txoj kev thauj khoom dawb nruab nrab luv luv, ua rau nws nyuaj rau khaws lub zog txaus los ua rau collisional ionization, ua rau ionization coefficient txo qis. Yog li ntawd, qhov hluav taws xob tawg Vbr nce nrog qhov kub nce (coefficient kub zoo), thaum qhov nce avalanche M txo qis nrog qhov kub nce (coefficient kub tsis zoo).
3. Txoj kev them nyiaj
Lub tswv yim tseem ceeb ntawm kev them nyiaj yog "kev nce ruaj khov", uas txhais tau tias khaws qhov sib piv ntawm Vbias / Vbr (T) tas li. Muaj peb hom kev daws teeb meem engineering tseem ceeb:
3.1 Kev them nyiaj analog / digital raws li kev siv hluav taws xob siab-voltage bias
Kev them nyiaj analog: Taw qhia lub network thermistor hauv lub voj voog tawm tswv yim / siv los xa tawm ncaj qha rau qhov hluav taws xob bias nrog cov coefficient kub zoo.
MCU nrhiav kev them nyiaj (kev daws teeb meem tseem ceeb): Lub ntsuas kub saib xyuas qhov kub, thiab MCU xam qhov hluav taws xob bias uas xav tau raws li lub rooj sib piv "kub tawg voltage" uas tau khaws cia ua ntej, thiab tswj cov zis ntawm lub module high-voltage los ntawm DAC. Polynomial fitting kuj tseem siv tau hloov chaw nrhiav lub rooj kom ua tiav kev tswj bias.
3.2 Kev Sib Koom Tes ntawm Lub Sensor Kub thiab BOOST Boost Circuit Closed Loop Control
3.3 Lub Tub Yees Semiconductor (TEC) PID Kev Tswj Kub Tsis Tu Ncua
4. Cov ntsiab lus luv luv thiab cov lus qhia xaiv
Qhov kub hloov pauv ntawm Avalanche Photodetector yog vim muaj kev vam khom ntawm semiconductor ionization rate rau ntawm lattice scattering, uas qhia tau tias yog Vbr positive temperature coefficient thiab M negative temperature coefficient.
Yuav tsum xaiv txoj kev them nyiaj raws li qhov sib npaug ntawm tus nqi, cov kev cai ua tau zoo, thiab cov kev txwv ntawm ib puag ncig
Qhov xwm txheej pheej yig → Kev them nyiaj simulation ntawm Thermistor
Kev teeb tsa qhov ntsuas qhov hluav taws xob digital MCU (nrhiav/kho)
Qhov xwm txheej rhiab heev → TEC tswj qhov kub tas li
Nrog rau kev txhim kho ntawm LiDAR thiab kev sib txuas lus quantum, cov txheej txheem them nyiaj kub ntse thiab me me yuav dhau los ua qhov kev txhawb nqa tseem ceeb rau daim ntawv thov ntawm APD photodetector.