Mai daidaita na'urar silicondon FMCW
Kamar yadda muka sani, ɗaya daga cikin muhimman abubuwan da ke cikin tsarin Lidar na tushen FMCW shine babban mai daidaita layi. An nuna ƙa'idar aikinsa a cikin hoto mai zuwa: Amfani daMai daidaita DP-IQbisadaidaitawar gefe ɗaya (SSB), sama da ƙasaMZMaiki a wurin da babu komai, a kan hanya da kuma gefen gefen wc+wm da WC-WM, wm shine mitar daidaitawa, amma a lokaci guda ƙananan tashar suna gabatar da bambancin mataki na digiri 90, kuma a ƙarshe an soke hasken WC-WM, kawai lokacin canza mita na wc+wm. A cikin Hoto na b, shuɗin LR shine siginar FM chirp ta gida, RX orange shine siginar da aka nuna, kuma saboda tasirin Doppler, siginar bugun ƙarshe tana samar da f1 da f2.
Nisa da saurin sune:
Ga wani labarin da Jami'ar Shanghai Jiaotong ta buga a shekarar 2021, game daSSBjanareto waɗanda ke aiwatar da FMCW bisa gamasu daidaita hasken silicon.
An nuna aikin MZM kamar haka: Bambancin aiki na masu daidaita hannu na sama da ƙasa yana da girma sosai. Rabon ƙin yarda da na'urar ɗaukar sideband ya bambanta da ƙimar daidaita mitar, kuma tasirin zai yi muni yayin da mitar ke ƙaruwa.
A cikin hoton da ke ƙasa, sakamakon gwajin tsarin Lidar ya nuna cewa a/b shine siginar bugun a daidai gudun da kuma a nisa daban-daban, kuma c/d shine siginar bugun a daidai nisa da kuma a gudu daban-daban. Sakamakon gwajin ya kai 15mm da 0.775m / s.
A nan, kawai amfani da siliconna'urar daidaita haskedon FMCW an tattauna. A zahiri, tasirin silicon optical modulator bai yi kyau kamar na ba.Mai daidaita LiNO3, galibi saboda a cikin na'urar sarrafa haske ta silicon, ƙarfin canjin lokaci/sha/juyawar lokaci/juyawar lokaci ba ta da layi tare da canjin ƙarfin lantarki, kamar yadda aka nuna a cikin hoton da ke ƙasa:
Wato,
Alaƙar wutar lantarki ta fitarwamai daidaitatsarin shine kamar haka
Sakamakon shine babban tsari na cirewa:
Waɗannan za su haifar da faɗaɗa siginar mitar bugun da kuma raguwar rabon sigina zuwa hayaniya. To menene hanyar inganta layi na na'urar daidaita hasken silicon? A nan muna tattauna halayen na'urar da kanta ne kawai, kuma ba za mu tattauna tsarin diyya ta amfani da wasu tsare-tsare masu taimako ba.
Ɗaya daga cikin dalilan rashin daidaituwar yanayin yanayin daidaitawa tare da ƙarfin lantarki shine cewa filin haske a cikin jagorar raƙuman ruwa yana cikin rarrabawa daban-daban na sigogi masu nauyi da haske kuma ƙimar canjin yanayi ya bambanta da canjin ƙarfin lantarki. Kamar yadda aka nuna a cikin hoton da ke ƙasa. Yankin raguwar da ke da babban tsangwama yana canzawa ƙasa da na tsangwama tare da haske.
Hoto mai zuwa yana nuna lanƙwasa na canjin yanayin TID na tsari na uku da kuma na SHD na harmonic na tsari na biyu tare da yawan tarkacen, wato, mitar daidaitawa. Ana iya ganin cewa ikon dannewa na detuning don tarkacen mai yawa ya fi na tarkacen haske. Saboda haka, sake haɗawa yana taimakawa wajen inganta layi.
Abin da ke sama yayi daidai da la'akari da C a cikin samfurin RC na MZM, kuma yakamata a yi la'akari da tasirin R. Ga abin da ke gaba shine canjin CDR3 tare da juriyar jerin. Ana iya ganin cewa ƙaramin juriyar jerin, mafi girman CDR3.
A ƙarshe amma ba mafi ƙaranci ba, tasirin silicon modulator ba lallai bane ya fi muni fiye da na LiNbO3. Kamar yadda aka nuna a cikin hoton da ke ƙasa, CDR3 namai daidaita siliconzai fi na LiNbO3 girma idan aka samu cikakken son kai ta hanyar tsara tsari da tsawon na'urar mai daidaita yanayin aiki yadda ya kamata. Yanayin gwaji ya kasance iri ɗaya.
A taƙaice, ƙirar tsarin na'urar daidaita hasken silicon za a iya rage ta ne kawai, ba a warke ba, kuma ko za a iya amfani da shi a cikin tsarin FMCW yana buƙatar tabbatar da gwaji, idan da gaske ne, to zai iya cimma haɗin transceiver, wanda ke da fa'idodi don rage farashi mai yawa.
Lokacin Saƙo: Maris-18-2024