Sib nqus teb sensor tuaj yeem tshawb pom cov xov xwm sib nqus hauv ib puag ncig, thiab ua lub zog kis, tus mob fais fab kis, aerospace thiab lwm daim teb. Raws li kev tshaj lij sib cav sib luag Nanomaterial, MHD tsis yog ua rau muaj cov khoom siv roj ntshato zoo nkauj heev, tab sis kuj yog cov khoom siv hluav taws xob ua kom zoo dua qub Nyob rau hauv xyoo tas los, MHD Fiber sib nqus teb sensor tau txhawj xeeb ntau yam, kev tiv thaiv corrosion, muaj kev nyab xeeb thiab txhawb nqa rau kev saib xyuas tej thaj chaw deb.
Tam sim no, cov kev sib nqus ua ke lub teb chaws sensor qauv ntawm MHD fiber ntau suav nrog MHD [8], ib-hom-hom fiber ntau-hom fiber ntau thiab ntev ntev. Cov sensors no yog demodulated los ntawm ob txoj kev tseem ceeb: kev kuaj pom tus nqi muaj txiaj ntsig zoo thiab ua kom tau txais kev ntsuas sib nqus. Txawm li cas los xij, lub sensor raws li kev pom tus nqi tau yooj yim yog cuam tshuam los ntawm lub zog hluav taws xob hloov kho ntawm lub hauv paus, uas yuav ua rau qhov ntsuas yuam kev nce ntxiv. Sensors raws li wavelenghwhength kom muaj kev cia siab rau ntsuas hluav taws xob hloov pauv, uas tsis yog yuav tsum tau nce nqi rau cov khoom siv kho tshiab. Tsis tas li ntawd, cov teeb pom zoo ntau zaus muab tsuas yog ib qho chaw ntawm kev ntsuas lub peev xwm.
Txhawm rau daws cov teeb meem no, ib-channel tapered fiber ntau cov sib nqus Lub kaw lus tau tsim los kom kov yeej cov kev txwv ntawm cov thev naus laus zis qub thiab muab ntau qhov tseeb, ntau lub ntsiab lus sib nqus xov kev ntsuas kev daws teeb meem.
Lub hauv paus ntsiab lus ntawm Ob Channel Conical Fiber sib nqus teb
Qhov kis tau, txais tos, photointric hloov dua tshiab thiab cov ntaub ntawv ntawm pulsed teeb yog ua los ntawm theem-rhiab lub sij hawm sau recindometer (otd) nyob rau sab laug ntawm daim duab. Vim yog lub zog loj ntawm cov mem tes thawj zaug thaum UM-OTD Dais xa cov mem tes xeem ntawv, tus tau txais cov teeb liab uas xa rov qab nyob rau lub sijhawm luv luv. Txhawm rau kom daws tau cov teeb meem no, ntsuas cov fiber tsawg txuas nrog cov zis ntawm OTDr. Cov txheej txheem ua haujlwm tshwj xeeb yog raws li hauv qab no: lub pulsed teeb tsim los ntawm lub pob hluav taws xob φ-otdr yog thawj zaug ntawm cov mem tes txheej txheem ntawm cov teeb liab txheej txheem tom ntej.
Lub teeb pom kev zoo ces txuas txuas mus rau chaw nres nkoj 2 ntawm cov kab, kis tau los ntawm kev kho sab hauv sab hauv, thiab tso zis los ntawm chaw nres nkoj 3 ntawm cov kab ncig. Tom ntej no, lub teeb pom kev nkag mus rau coupler 1 (OC1), qhov twg 1% ntawm OC 90, thaum 99% ntawm lub teeb pom kev zoo kom hnov tau kom hnov tau kom hnov tau kom paub txog cov channel 2 uas muaj OC3 thiab OC4. Nyob rau hauv kev xav paub channel 1, lub pulsed teeb tau rov qab mus rau OC2 tom qab dhau los ntawm kev xav tau (Su), thiab 1% ntawm lub teeb tau kis rov qab mus rau lub voj voos. Ib yam li ntawd, hauv kev xav paub channel 2, lub teeb kuj ua raws tib txoj kev mus voj voog. Kev taug kev ntawm lub pulsed teeb yog qhia los ntawm cov xub hauv daim duab. Pulsed lub teeb tau cycled ntau zaus nyob rau hauv cov kev xav channel, thiab txhua zaus nws dhau los ntawm cov pob sib nqus su, nws yuav tau qee yam poob.
Ruaj khov xeem ntawv
Ua ntej, nyob rau hauv qhov chaw tsis sib nqus chaw nyob ib puag ncig, cov tso zis kho qhov muag ntawm lub laser tau rov ua dua rau txoj kab ntawm nruab nrab ntawm cov kab ke, raws li muaj nyob hauv Daim Duab. 4 (a). Nws tuaj yeem pom tau tias qhov nruab nrab tso zis optical lub zog ntawm lub laser yog}}} mw, uas yog sib npaug rau 4.26% ntawm qhov nruab nrab. Nyob rau hauv 3 {{{}} rechnuming impliments, qhov ntsuas nruab nrab ntawm sensor channel 1}}}}}. 109 db / km thiab 0.124 db / km, Kev sau nyiaj rau 0.942% thiab 0.684% ntawm lawv cov lus txhais tau tias muaj txiaj ntsig, feem. Qhov no qhia tau hais tias txawm hais tias lub zog ntawm lub teeb ua kev hloov pauv, lub kaw lus tseem qhia tau kev ruaj khov zoo thiab ntsuas kev ntsuas tau yog txhim khu kev qha.
Qhov thib ob, lub renor raws li 1 thiab 2 tau muab tso rau hauv qab kev sib nqus sib nqus ntawm 5 mt los ntsuas cov lus teb uas muaj kev sib nqus. Cov txiaj ntsig sim tau pom hauv Daim Duab. 4 (b). Nws tuaj yeem pom tau tias qhov nruab nrab hauv nruab nrab ntawm kev pom zoo channel 1 yog}}}. 131 DB / KM, Accialing rau {}. 882% ntawm tus nqi nruab nrab. Qhov nruab nrab attenfital slope ntawm sensor channel 2 {}}. 94 db / k}}. 312% ntawm tus nqi. Cov ntaub ntawv no ua pov thawj tias cov lus teb ntawm cov kev ntsuas ntawm lub zog hauv qab ntawm cov kev sib nqus muaj cov kev sib nqus muaj kev sib nqus thiab ruaj khov.
Lub tswv yim tshiab dual-channel tapered fiber ntau cov sib nqus kev sib nqus (TDM) thev naus laus zis ntau zaus sib nqus teb cov kev sib nqus. Lub kaw lus kuaj pom tus nqi ua raws li ntawm pulsed teeb nyob rau hauv cov kev xav txog cov channel precisely thiab ua ke los paub kev ntsuas ib txhij ntawm ntau lub ntsiab lus sib nqus.
Piv nrog cov tsoos Mhd Fiber sib nqus teb sensor, tab sis kuj tau ua kom muaj zog dua lub peev xwm rov qab muaj zog, tab sis kuj tseem muaj zog rau lub zog hluav taws xob. Qhov kev sim ua kom pom tau tias cov kev sib nqus ntawm cov kev sib nqus ntawm ob qho kev pom zoo ntawm {}}. 466}. 466}. 42 mt thiab 2 ~ 7 mt. Cov ntaub ntawv no qhia tau tias lub kaw lus tuaj yeem muab kev ntsuas siab tau tshwm sim ntau ntau ntawm cov sib nqus.
Lub kaw lus siab muaj ntau cov txiaj ntsig: Cov txheej txheem ntau lawm, muaj zog rov qab siv zog, kev txhawb nqa zoo, txhawb rau cov chaw taws teeb saib xyuas thiab lwm yam. Yog li ntawd, nws yog tsim nyog tshwj xeeb rau cov ntawv thov uas xav tau ntau cov kab sib xyaw ua ke, xws li cov chaw tiv thaiv loj thiab kev tshawb fawb dav dav, qhia dav cov ntawv thov kev thov.