Uthotho lweFotodetector: Intshayelelo kwiBalance Photodetector

Intshayelelo kuI-Balance Photodetector(Isitshingi se-Optoelectronic Balance)
I-Balance Photodetector inokwahlulwa ibe yi-fiber optic coupling type kunye ne-spatial optical coupling type ngokwendlela yokudibanisa optical. Ngaphakathi, iqulethe i-photodiode ezimbini ezihambelana kakhulu, ingxolo ephantsi, imodyuli yesiphaluka se-bandwidth transimpedance amplifier, kunye nemodyuli yamandla ephantsi kakhulu. Ineempawu zomlinganiselo ophezulu wokulahlwa kwendlela eqhelekileyo, ingxolo ye-ultra-low, kunye ne-bandwidth ephezulu, kwaye isetyenziswa ngokubanzi kwintsimi yonxibelelwano oluhambelanayo lwe-optical. Ibe yindawo yophando kumashishini kunye neeyunivesithi kumazwe ahlukeneyo kwiminyaka yakutshanje.
Umgaqo wokuSebenza weBalance Photodetector (I-Optoelectronic Balance Detector)
I-Balance Photodetector isebenzisa iifotodiodes ezimbini kwimo eguqukayo njengeyunithi yokufumana ukukhanya. Xa ufumana isignali yokukhanya, i-photocurrent eveliswa ziifotodiode ezimbini iyathatyathwa kwaye idityaniswe ne-transimpedance amplifier ukuguqula isignali yangoku ibe ngumqondiso wombane ukuze uphume. Ukusetyenziswa kwesakhiwo sokunciphisa ukuzimela kunokucinezela ngokufanelekileyo isignali yemowudi eqhelekileyo eyaziswa ngokukhanya kwe-oscillator yendawo kunye nobumnyama bangoku, ukwandisa umqondiso wemowudi yokwahlula, kwaye kwinqanaba elithile liphucule ukukwazi ukubonwa kweempawu zokukhanya ezibuthathaka.
Izinto eziluncedo: Umlinganiselo ophezulu wokulahlwa kwendlela eqhelekileyo, uvakalelo oluphezulu, kunye ne-bandwidth ephezulu yokufumanisa inokuhlangabezana neemeko ezahlukeneyo zesicelo.
Ukungalungi: Amandla okukhanya asezantsi agcweleyo, alungele kuphela ukufumanisa ukukhanya obuthathaka, ukudibanisa kufuneka kuphuculwe.

I-FIG: Idayagram yomgaqo wokusebenza we-balance detector
Iiparamitha zokusebenza kweBalance Photodetector (OptoelectronicI-Balance detector)
1. Ukusabela
Ukuphendula kubhekiselele ekusebenzeni kakuhle kwefotodiode ekuguquleni imiqondiso yokukhanya ibe yifotocurrent, ewumlinganiselo wephotocurrent kumandla okukhanya. Ukukhetha i-photodiode kunye nokuphendula okuphezulu kunokuphucula ngokufanelekileyo uvakalelo lwe-Balance Photodetector.
Ukuphendula kubhekiselele ekusebenzeni kakuhle kwefotodiode ekuguquleni imiqondiso yokukhanya ibe yifotocurrent, ewumlinganiselo wephotocurrent kumandla okukhanya. Ukukhetha i-photodiode kunye nokuphendula okuphezulu kunokuphucula ngokufanelekileyo uvakalelo lwe-Balance Photodetector.
2. Ubungakanani boluhlu
I-bandwidth imele i-frequency yesignali apho i-amplitude yesiginali ye-Balance Photodetector ibola nge-3dB, kwaye ihambelana ne-parasitic capacitance ye-photodiode, ubungakanani be-transimpedance, kunye nemveliso ye-bandwidth ye-amplifier yokusebenza.
3. Umlinganiselo wokulahlwa kwendlela eqhelekileyo
Umlinganiselo wokulahlwa kwendlela eqhelekileyo isetyenziselwa ukulinganisa iqondo lokunyanzeliswa kweempawu zemowudi eziqhelekileyo ngababonisi abalinganiselayo, kwaye iimveliso zorhwebo ngokubanzi zifuna ubuncinci bendlela eqhelekileyo yokugatywa kwe-25dB.
4.NEP
I-Noise Equivalent Power: Amandla omqondiso wegalelo afunekayo kwi-signal-to-noise ratio ye-1, eyipharamitha ebalulekileyo yokulinganisa ukusebenza kwengxolo yenkqubo. Amacandelo aphambili ingxolo ye-detector elungeleleneyo yingxolo ye-optical scattering kunye nesandi sombane.

Ukusetyenziswa kwe-Balance Photodetector (i-Optoelectronic Balance Detector)
Kwiminyaka yakutshanje, i-Balance Photodetector isetyenziswe ngokubanzi kwiinkalo ezifana ne-laser wind radar, i-laser vibration measurement, i-fiber optic sensing, ukukhanya okubuthathaka okubonakalayo, ukubonwa kwe-spectral, ukubonwa kwegesi, njl njl.