Kodi chowunikira zithunzi cha PIN n'chiyani?

Kodi ndi chiyaniChowunikira chithunzi cha PIN

Chojambulira zithunzi ndi chida chodziwira bwino kwambirichipangizo cha semiconductor photonicchomwe chimasintha kuwala kukhala magetsi pogwiritsa ntchito mphamvu ya photoelectric. Gawo lake lalikulu ndi photodiode (PD photodetector). Mtundu wodziwika kwambiri umapangidwa ndi PN junction, ma electrode leads ofanana ndi chubu shell. Chimakhala ndi unidirectional conductivity. Voltage yopita patsogolo ikagwiritsidwa ntchito, diode imagwira ntchito; voltage yobwerera ikagwiritsidwa ntchito, diode imadulidwa. PD photodetector ndi yofanana ndi diode yodziwika bwino ya semiconductor, kupatula kutiChowunikira zithunzi cha PDimagwira ntchito pogwiritsa ntchito mphamvu yamagetsi yobwerera m'mbuyo ndipo imatha kuonekera. Imapakidwa kudzera pawindo kapena kulumikizana ndi ulusi wa kuwala, zomwe zimathandiza kuti kuwala kufikire gawo la chipangizocho lomwe limayang'ana kuwala.

Pakadali pano, gawo lomwe limagwiritsidwa ntchito kwambiri mu PD photodetector si PN junction koma PIN junction. Poyerekeza ndi PN junction, PIN junction ili ndi I layer yowonjezera pakati. I layer ndi N-type semiconductor yokhala ndi doping concentration yochepa kwambiri. Chifukwa ndi pafupifupi Intrinsic semiconductor yokhala ndi concentration yochepa, imatchedwa I layer. Layer I ndi yokhuthala pang'ono ndipo pafupifupi imatenga dera lonse la depletion. Ma photon ambiri a incident amayamwa mu I layer ndikupanga ma electron-hole pairs (photogenerated carriers). Kumbali zonse ziwiri za I layer pali P-type ndi N-type semiconductors okhala ndi doping concentration yambiri kwambiri. Ma P ndi N layer ndi ochepa kwambiri, omwe amayamwa gawo laling'ono kwambiri la incident photons ndikupanga ma photocarriers ochepa opangidwa ndi photoelectric. Kapangidwe kameneka kakhoza kufulumizitsa kwambiri liwiro la reaction ya photoelectric effect. Komabe, dera lotambalala kwambiri la depletion lidzawonjezera nthawi yoyenda ya ma photocarriers opangidwa ndi photoelectric m'dera la depletion, zomwe m'malo mwake zimapangitsa kuti response ichepe. Chifukwa chake, m'lifupi mwa dera la depletion liyenera kusankhidwa moyenera. Liwiro la yankho la PIN junction diode lingasinthidwe mwa kulamulira m'lifupi mwa dera lotha ntchito.

Chowunikira chithunzi cha PIN ndi chowunikira bwino kwambiri cha ma radiation chomwe chili ndi mphamvu zambiri komanso chogwira ntchito bwino pozindikira. Chimatha kuyeza molondola mitundu yosiyanasiyana ya mphamvu ya ma radiation ndikupeza yankho mwachangu komanso magwiridwe antchito olimba kwambiri.chowunikira zithunziNdi kusintha zizindikiro ziwiri za mafunde a kuwala pambuyo pa ma frequency a beat kukhala zizindikiro zamagetsi, kuchotsa phokoso lowonjezera la mphamvu ya kuwala kwa oscillator, kukulitsa chizindikiro cha ma frequency apakati, ndikukweza chiŵerengero cha chizindikiro-ku-phokoso. Ma PIN photodetector ali ndi kapangidwe kosavuta, kosavuta kugwiritsa ntchito, kukhudzidwa kwambiri, kukwera kwambiri, bandwidth yayikulu, phokoso lochepa, komanso mphamvu yamphamvu yoletsa kusokoneza. Amatha kugwira ntchito mokhazikika m'malo osiyanasiyana ovuta ndipo amagwiritsidwa ntchito makamaka pozindikira chizindikiro cha lidar poyesa mphepo.