Ultrasonic Gas Flow Meter -Dab tsi yog ultrasonic flow metercov khoom siv feem ntau siv hauv cov kav dej roj - yog lub ntsuas dej ntws nruab rau ntawm lub raj xa dej uas nqa cov roj ntws thiab ntsuas cov roj ntws siv lub hauv paus ntsiab lus ntawm ultrasound. Ib qho -channel ultrasonic gas flow meter yog ib qho cuab yeej nruab nrog ib qho channel nkaus xwb; ib tug multi-channel ultrasonic gas flow meter muaj ob los yog ntau tshaj. Lub hauv paus ntsiab lus ntawm ultrasonic gas flow meter rau ntsuas ndlwg tshaj tawm yog xam cov tseem ceeb ntawm cov kua roj, xws li tshaj tawm, ntws tus nqi, thiab ceev, los ntawm kev ntsuas lub sij hawm propagation ntawm ultrasound tsis nyob rau hauv cov pa nruab nrab.
Kev tshuaj xyuas ntawm lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm lub sijhawm- qhov sib txawv ntawm kev ntsuas ultrasonic gas ntws
Lub sij hawm- txawv txoj kev rau kev ntsuas cov pa roj ultrasonic - ib txoj cai feem ntau hais txog hauvTxhais ntawm Ultrasonic Flow Meter- txiav txim siab qhov nruab nrab roj tshaj tawm raws lub suab channel los ntawm kev siv lub sij hawm nthuav tawm qhov sib txawv ntawm ob lub suab ultrasonic propagating nyob rau hauv tib txoj kev thiab nyob rau hauv lub opposite direction. Thaum ultrasound propagates nyob rau hauv ib tug ntws nruab nrab roj, nws ceev hloov nrog cov roj tshaj tawm. Tshwj xeeb tshaj yog, kev nthuav tawm ceev ntawm ultrasound hloov nyob rau hauv tib txoj kev raws li cov roj tshaj tawm: thaum lub roj tshaj tawm nce, qhov ceev ntawm ultrasound propagating nyob rau hauv tib txoj kev coj kuj nce; conversely, yog hais tias cov roj tshaj tawm nce nyob rau hauv lub opposite kev taw qhia mus rau lub ultrasound propagation, qhov ceev ntawm lub ultrasound yuav txo raws li.
Basic Structure ntawm Ultrasonic Pipe Flow Sensor
Raws li pom hauv daim duab 2.1 - ib txwmSchematic Diagram ntawm Ultrasonic Flow Meter- ob lub ultrasonic transducers (hu ua probes los yog transducers) muaj peev xwm ntawm ob qho tib si kis thiab tau txais ultrasonic pulses yog embedded nyob rau hauv ib los yog ob sab ntawm cov yeeb nkab. Txoj kev tiag tiag ntawm lub teeb liab ultrasonic ntawm ob lub transducers yog hu ua lub suab channel, yog li ib khub ntawm transducers tsim ib lub suab channel. Cov transducers raug cais tawm ntawm cov kua nruab nrab los ntawm lub suab -pob tshab membrane los yog ib feem ntawm acoustic duct phab ntsa. Hauv ib qho -channelultrasonic flow meter, lub waveguide ntawm ob lub ultrasonic transducers cuam tshuam cov axis ntawm cov khoom siv.
Raws li pom hauv daim duab 2.1, cov yeeb nkab txoj kab uas hla yog D, thiab qhov ncaj - kab ntev ntawm lub ntsej muag kawg ntawm ob lub transducers A thiab B kos rau ntawm ob sab ntawm cov yeeb nkab yog qhov ntev L (tseem hu ua suab kab L). Nws txoj kev sib raug zoo nrog txoj kab uas hla D yog raws li nram no:
Hauv cov qauv: Φ yog lub kaum sab xis ntawm lub suab channel, uas yog lub kaum sab xis ntawm lub suab channel thiab lub axis ntawm cov yeeb nkab. Lub kaum sab xis ntawm lub suab channel kuj yog qhov xwm txheej ntawm lub yoj ultrasound.
Lub kaum sab xis xwm txheej - feem ntau tau tham hauv qhovCov qauv ntawm Ultrasonic Flow Meterzoo li hauvBlock Diagram ntawm Ultrasonic Flow Meter- cuam tshuam los ntawm ob qho tib si lub suab nrawm hauv cov kua dej thiab lub suab nrawm hauv cov khoom siv acoustic thiab cov yeeb nkab phab ntsa. Txawm li cas los xij, qhov kev hloov ntawm lub suab nrawm nrog qhov kub thiab txias feem ntau me me rau cov khoom siv dua li cov khoom siv roj. Thaum qhov kub hloov pauv me me, qhov cuam tshuam ntawm acoustic wedge thiab cov yeeb nkab phab ntsa khoom ntawm kev ntsuas qhov tseeb tuaj yeem tsis quav ntsej; Txawm li cas los xij, thaum qhov kub hloov pauv loj, kev kho yuav tsum tau ua rau qhov kev hloov pauv tseem ceeb hauv lub suab nrawm ntawm cov acoustic wedge thiab cov yeeb nkab phab ntsa khoom.
Lub transducer nrog qhov xwm txheej ntawm 30℃muaj qhov sib kis tau zoo, tsis tshua muaj zog poob, thiab qis excitation voltage, ua rau nws haum rau handheld ultrasonic flow meters qhov twg AC fais fab tuag tsis yooj yim. Lub transducer nrog qhov xwm txheej ntawm lub kaum sab xis ntawm 45℃muaj qhov qis dua, tab sis qhov hloov pauv siv lead ua loj tuaj yeem nce ntxiv kom nce qhov excitation voltage, ua rau nws tsim nyog rau qhov chaw nres tsheb ultrasonic flow meters lossis cov uas tuaj yeem siv AC zog.
