Ultrasonic transducers ua lub luag haujlwm tseem ceeb hauv ultrasonic vuam tshuab. Ib lub zoo ultrasonic transducer tuaj yeem ua kom muaj zog thiab ruaj khov tso zis tawm lub zog. Tsuas yog thaum koj nkag siab cov tsis ntawm lub ultrasonic transducer koj tuaj yeem phim koj ultrasonic generator. Yog li, yuav ua li cas txiav txim rau kev ua haujlwm ntawm ultrasonic transducers?
1. Tsis
1) Neeg kho tshuab resonance zaus (Fs)
Qhov no hais txog kev ua haujlwm tsawg zaus ntawm lub tseev tsim, uas yuav tsum nyob ze rau qhov txiaj ntsig yuav tsum muaj nyob rau hauv tus qauv tsim, thiab yuav tsum sib phim nrog kev ua haujlwm ntawm qhov ntsuas hluav taws xob.
2) Dynamic tsis kam (R1)
Qhov tsis kam ntawm cov ceg txuas ntawm cov kab hluav taws xob piezoelectric vibrator yuav tsum me me li sai tau nyob hauv tib qho kev txhawb nqa! Txog kev ntxuav lossis vuam vibrators, feem ntau yog nruab nrab ntawm 5Ω-20Ω. Yog tias nws loj dhau, yuav muaj teeb meem nrog lub tshee lossis kev co lub zog, xws li lub tshuab hluav taws xob tsis sib xws lossis lub zog hloov qis dua, lub neej luv ntawm lub vibrator, thiab lwm yam.
3) Txhua yam zoo tshaj (Qm)
Kev txiav txim siab los ntawm cov txheej txheem kev coj ua nkhaus, Qm=Fs / (F2-F1), Qm siab dua, zoo dua, vim tias Qm ntau dua, ntau dua qhov ua haujlwm ntawm cov oscillator. Tab sis Qm yuav tsum sib phim nrog cov fais fab. Thaum Qm tus nqi nce siab dhau lawm, lub tshuab fais fab tsis tuaj yeem sib phim. Txhawm rau tu lub vibrator, ua tau Qm tus nqi siab dua, zoo dua. Feem ntau hais lus, Qm ntawm lub tshuab ua kev tu tsev yuav tsum yog 500-1000. Yog tias nws qes dhau, qhov ua haujlwm ntawm lub tshee yuav tsawg, thiab yog tias nws siab dhau, lub hwj huam mov tsis tuaj yeem sib phim. Rau ultrasonic vuam lossis kev ua, Qm tus nqi ntawm lub vibrator nws tus kheej yog feem ntau ntawm 50-1000, thiab tag nrho cov system yog 1500-3000. Yog tias nws tsawg dhau, qhov ua rau kev vibration yuav tsawg, tab sis nws yuav tsum tsis txhob siab dhau, vim tias Qm siab dua, kev ua haujlwm loj npaum li cas. Txoj hauv kev nqaim, lub hwj huam sib txuas yog qhov nyuaj rau qhov sib xyaws, uas yog, lub hwj huam hluav taws xob tsis yooj yim rau kev ua haujlwm ntawm qhov rov ua haujlwm siab, thiab cov cuab yeej tsis tuaj yeem ua haujlwm ib txwm ua.
4) Lub Zog Dawb (CT)
Lub zog capacitance ntawm piezoelectric ntaus ntawv ntawm ib zaus ntawm 1kHz yog ua raws nraim nrog tus nqi ntsuas los ntawm cov ntsuas hluav taws xob digital ntsuas. Cov nqi no rho tawm ntawm kev ua haujlwm tau zoo ntawm C1 kom tau txais qhov khoom siv hluav taws xob tiag C0, C0=CT-C1. Thaum siv inductance kom sib npaug C0, hauv kev tsim kho Circuit Court ntawm lub tshuab ua ultrasonic, qhov sib npaug kom yog ntawm C0 tuaj yeem txhim kho qhov zoo ntawm lub zog ntawm lub hwj huam, muaj ob txoj hauv kev siv inductance tshuav, cov sib law liag thiab cov sib dhos ua ke.
5) Anti-resonance zaus (Fp)
Lub resonance zaus ntawm cov ceg hluav taws xob sib txuam ntawm cov piezoelectric vibrator. Ntawm qhov zaus no, lub impedance Zmax ntawm lub piezoelectric vibrator yog qhov loj tshaj plaws. Yog hais tias qhov cuam tshuam rov qab los tiv thaiv Zmax qis heev, lub suab ua kom pom tau muaj teeb meem.
2. Cov duab duab
Feem ntau hais lus, kev ua haujlwm ntawm kev tsuj ntawm lub tshuab kev co lossis lub tshuab hluav taws xob piezoelectric transducer tuaj yeem raug txiav txim ncaj qha los ntawm lub cav qhov sib koom ua ke hauv daim duab, uas yog yooj yim thiab kev xav tau.
1) Raws li qhov xwm txheej ib txwm, lub voj voos admittance yog ib lub voj voog, thiab lub logarithmic graph tsuas muaj ob khub ntawm qhov tsawg kawg nkaus thiab qhov tseem ceeb tshaj plaws.
2) Nyob rau hauv cov xwm txheej tsis zoo, ntau lub voj me ntawm cov kab sib txuam tau tshwm sim ntawm kab sib chaws admittance graph, thiab logarithmic coordinate graph muaj ntau tus khub ntawm yam tsawg kawg thiab qhov tseem ceeb.
Yog li nyob rau hauv dab tsi tshwm sim yuav admittance vajvoog thiab kev coj nkhaus ntawm piezoelectric ceramics lossis hloov pauv tshwm sim txawv txav? Muaj feem ntau yog cov xwm txheej hauv qab no:
1) Piezoelectric ceramics muaj teeb meem, xws li sab hauv delamination.
2) Daim tawv nti nti tshwm sim thaum sib dhos ntawm qhov hloov ntawm.
3) Cov teeb meem nrog cov qauv tsim lossis kev sib dhos ntawm ultrasonic horn thiab pwm.
4) Qhov chaw nyob ib ncig ntawm tus pas nrig kev nyuaj siab tsoo vim qhov tsis zoo mloog ntawm lub tshuab hloov pauv.
Feem ntau hais lus, kev qhuas cov kab thiab kev nkag mus muaj feem cuam tshuam rau txhua lwm yam. Yog hais tias qhov kev cia ntawm txoj kab ntawm qhov ntsuas qhov ib ce yog qhov qub, R1 qis dua thiab Qm siab dua. Ntawm qhov tsis sib xws, yog tias txoj kab kev nkag ntawm lub tshee tshee yog qhov txawv txav, feem ntau R1 loj dua thiab Qm me dua. Raws li yog ib feem tseem ceeb ntawm cov khoom siv ultrasonic, qhov zoo ntawm ultrasonic transducer yog cuam tshuam ncaj qha rau kev pab lub neej ntawm cov khoom siv.
