Lub hauv paus ntsiab lus ntawm theem photoelectric rangefinder
Lub teeb nthwv dej (lub teeb infrared lossis laser) tso tawm los ntawm lub teeb ci nkag mus rau hauv lub modulator thiab yog modulated los ntawm high-frequency xws li teeb liab los ntawm tus tswv oscillator (hu ua tus tswv oscillator), dhau los ua amplitude-modulated yoj. Qhov no amplitude modulation yoj los ntawm sab nraud optical txoj kev mus rau hauv lub receiver, convergence nyob rau hauv lub photoelectric ntaus ntawv, lub optical teeb liab yog tam sim ntawd hloov mus rau hauv ib tug hluav taws xob teeb liab. Cov teeb liab hluav taws xob no yog qhov amplitude modulated yoj puag ncig mus rau qhov ntsuas kab tom qab demodulation ntawm cov teeb liab siab heev, nws theem tau ncua sijhawm.
Qhov no high-frequency ranging signal thiab high-frequency signal los ntawm lub zos oscillator (hu ua lub zos oscillator) los ntawm cov teeb liab sib tov rau photoelectric mixing, zaus xaiv thiab amplification kom tau ib tug tsawg-frequency ranging teeb liab, qhia nyob rau hauv. thawj theem ncua sij hawm ntawm high-frequency ranging teeb liab tseem khaws cia. Txhawm rau nqa tawm tshaj li theem, lub ntsiab oscillation high-frequency ranging teeb liab yog ib feem ntawm cov teeb liab siv hu ua nrog lub teeb liab ntau zaus thiab oscillation tib lub sij hawm mus rau hauv cov khoom siv teeb liab siv, tom qab xaiv zaus thiab amplification, tau txais tuaj yeem siv tau raws li kev siv tshaj li theem ntawm kev siv lub teeb liab ntawm qhov tsawg-zaus, hais tias, vim tias tsis muaj kev ncig mus ncig mus rau txoj kab ntsuas, yog li tsis muaj ntxhw nyob hauv tiam ntawm lub sijhawm ntawd qeeb. Yog li ntawd, thiab tib lub sijhawm pub mis rau phasor siv cov thev naus laus zis ntsuas cov thev naus laus zis rau theem kev sib piv, hauv cov zaub yuav qhia cov txiaj ntsig ntawm cov teeb liab mus rau thiab los ntawm kab ntawm kev ntsuas ntawm theem qeeb.
Thaum siv qhov ntsuas zaus, cov zaub yuav tsuas yog tsawg dua ib lub lim tiam ntawm theem sib txawv ntawm tus lej sib thooj, ntau tshaj li ib lub lim tiam ntawm tus lej ntawm tag nrho lub lis piam ntawm qhov sib txuas ntawm qhov ntsuas ntawm tus naj npawb ntawm cov ko taw tsis tuaj yeem ua tau. paub, vim li no, theem rangefinder lub ntsiab oscillator thiab kev co ntawm ob lub ntsiab lus kuj muaj cov txheej txheem coarse scale oscillation zaus, piv txwv li, zaus ntawm lub ntsiab oscillator thiab oscillation zaus ntawm oscillator. Raws li tau hais ua ntej, yog tias qhov kev ntsuas tib yam nrog cov ntxhib ntsuas cov kab xev ntau zaus, cov kab xev ntsuas zoo thiab ib pawg ntawm cov ntxhib ntsuas cov kab xev sib xyaw ua ke, koj tuaj yeem tau txais tag nrho qhov kev ncua deb los ntsuas qhov tseem ceeb.
