Iindaba - inzwa ye-dTOF: Umgaqo osebenzayo kunye namacandelo angundoqo.

Bhalisela kwiMedia yethu yeNtlalo ukuze ufumane iPosi ngokukhawuleza

Itekhnoloji yeXesha elithe ngqo le-Flight (dTOF) yindlela entsha yokulinganisa ngokuchanekileyo ixesha lokubhabha lokukhanya, kusetyenziswa indlela yeTime Correlated Single Photon Counting (TCSPC).Le teknoloji ibalulekile kwizicelo ezahlukeneyo, ukusuka ekucingeni ukusondela kwi-elektroniki yabathengi ukuya kwiinkqubo eziphambili ze-LiDAR kwizicelo zeemoto.Embindini wayo, iinkqubo ze-dTOF zibandakanya amacandelo abalulekileyo aliqela, ngalinye lidlala indima ebalulekileyo ekuqinisekiseni imilinganiselo echanekileyo yomgama.

Amacandelo anguNdoqo weeNkqubo ze-dTOF

Umqhubi weLaser kunye neLaser

Umqhubi welaser, oyinxalenye ebalulekileyo yesekethe yothumelo, uvelisa imiqondiso yedijithali yepulse ukulawula ukukhutshwa kwelaser ngokutshintsha kweMOSFET.IiLaser, ngakumbiIiLasers eziPhumayo kwiCavity Surface(IiVCSELs), zithandwa ngenxa yespectrum yazo emxinwa, ukuqina kwamandla aphezulu, amandla okuguqula ngokukhawuleza, kunye nokulula kokudityaniswa.Ngokuxhomekeke kwisicelo, ubude bamaza be-850nm okanye i-940nm bukhethwa ukulinganisela phakathi kweencopho zokufunxa kwe-solar spectrum kunye nokusebenza kakuhle kwe-sensor quantum.

UThutho kunye nokuFumana i-Optics

Kwicala lokudlulisa, i-lens elula ye-optical okanye idibaniso yeelensi ezidibanisayo kunye ne-Diffractive Optical Elements (DOEs) iqondisa i-laser beam kwintsimi efunwayo yokujonga.I-optics efumanayo, ejolise ekuqokeleleni ukukhanya ngaphakathi kwendawo ekujoliswe kuyo, ixhamla kwiilensi ezinamanani aphantsi ka-F kunye nokukhanya okuphezulu okuhambelanayo, kunye nezihluzo ezinqamlekileyo zokuphelisa ukuphazamiseka kokukhanya okungaphandle.

I-SPAD kunye ne-SiPM Sensors

I-single-photon avalanche diodes (SPAD) kunye ne-Silicon photomultipliers (SiPM) zezona zinzwa eziphambili kwiinkqubo ze-dTOF.I-SPADs zihlukaniswa ngokukwazi ukuphendula kwiifotoni ezilodwa, ezibangela i-avalanche yangoku eyomeleleyo ngefoton enye, ezenza zibe zilungele imilinganiselo echanekileyo.Nangona kunjalo, ubukhulu bepixel yabo enkulu xa kuthelekiswa nezinzwa zeCMOS zemveli zinciphisa isisombululo sendawo yeenkqubo ze-dTOF.

Ixesha-ukuya-kwiDijithali isiguquli (TDC)

Isekethe ye-TDC iguqulela iimpawu ze-analog kwiimpawu zedijithali ezimele ixesha, ukubamba umzuzu ochanekileyo i-photon pulse nganye irekhodwa.Oku kuchaneka kubalulekile ekumiseleni indawo ekujoliswe kuyo ngokusekwe kwi-histogram yee-pulses ezirekhodiweyo.

Ukuphonononga iiParamitha zokuSebenza kwe-dTOF

Uluhlu lokufunyanwa kunye nokuchaneka

Uluhlu lokubhaqa lwenkqubo ye-dTOF ngokwethiyori lunwenwela ukuya kuthi ga apho ii-pulses zokukhanya zingahamba kwaye zibonakaliswe emva kwi-sensor, ichongwe ngokucacileyo kwingxolo.Kubathengi be-electronics, ugxininiso luhlala lungaphakathi kwi-5m uluhlu, kusetyenziswa i-VCSELs, ngelixa izicelo ze-automotive zingafuna uluhlu lwe-100m okanye ngaphezulu, lufuna ubugcisa obuhlukeneyo njenge-EELs okanye.i-fiber lasers.

cofa apha ukufunda ngakumbi malunga nemveliso

Uluhlu oluphezulu olungenamakhwiniba

Uluhlu oluphezulu ngaphandle kokungaqondakali luxhomekeke kwixesha eliphakathi kwee-pulses ezikhutshwayo kunye ne-modulation frequency ye-laser.Umzekelo, kunye ne-modulation frequency ye-1MHz, uluhlu olucacileyo lunokufikelela kwi-150m.

Ukuchaneka kunye nemposiso

Ukuchaneka kwiinkqubo ze-dTOF kunqunyelwe ngokwendalo ngobubanzi be-pulse ye-laser, ngelixa iimpazamo zinokuvela kwizinto ezahlukeneyo zokungaqiniseki kumacandelo, kubandakanywa nomqhubi we-laser, impendulo ye-SPAD sensor, kunye nokuchaneka kwesekethe ye-TDC.Amaqhinga afana nokusebenzisa i-SPAD yokukhangela inokunceda ukunciphisa ezi mpazamo ngokuseka isiseko sexesha kunye nomgama.

Ingxolo kunye nokuThintana koMphazamiso

Iisistim ze-dTOF kufuneka zilwe ingxolo yangasemva, ngakumbi kwindawo yokukhanya okuqinileyo.Ubuchwephesha obunjengokusebenzisa iipikseli ezininzi ze-SPAD ezinamaqondo ahluka-hlukeneyo okuthomalalisa anokunceda ukulawula lo mngeni.Ukongeza, isakhono se-dTOF sokwahlula phakathi kokubonisa ngokuthe ngqo kunye neendlela ezininzi kwandisa ukomelela kwayo ngokuchasene nokuphazamiseka.

ISigqibo seSithuba kunye nokuSetyenziswa kwamandla

Ukuqhubela phambili kwi-teknoloji ye-SPAD ye-sensor, efana nokuguqulwa kokukhanya kwecala langaphambili (i-FSI) ukuya kwiinkqubo zokukhanyisa ngasemva (BSI), ziye zaphucula kakhulu amaxabiso e-photon absorption kunye nokusebenza kakuhle kwenzwa.Le nkqubela phambili, idityaniswe nendalo eshukumayo yeenkqubo ze-dTOF, ikhokelela kusetyenziso lwamandla olusezantsi xa kuthelekiswa neenkqubo zamaza eziqhubekayo ezifana ne-iTOF.

Ikamva leTekhnoloji ye-dTOF

Ngaphandle kwemiqobo ephezulu yobugcisa kunye neendleko ezinxulumene nobuchwepheshe be-dTOF, iingenelo zayo ngokuchaneka, uluhlu, kunye nokusebenza kakuhle kwamandla kuyenza ibe ngumgqatswa othembisayo kwizicelo zexesha elizayo kwiinkalo ezahlukeneyo.Njengoko itekhnoloji ye-sensor kunye noyilo lwesekethe yombane iqhubeka nokuvela, iinkqubo ze-dTOF zilungele ukwamkelwa ngokubanzi, ukuqhuba izinto ezintsha kwi-elektroniki yabathengi, ukhuseleko lweemoto, nangaphaya.

Ukusuka kwiphepha lewebhu02.02 TOF系统第二章 dTOF系统 - 超光 Ngokukhawuleza kunokukhanya (faster-than-light.net)
ngumbhali: Chao Guang

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