Yuav ua li cas paub qhov zoo ntawm ultrasonic transducer? Dab tsi tsis cuam tshuam rau nws?

Ultrasonic transducer

1. Parameters

1) Mechanical resonance zaus (Fs)

Qhov no yog hais txog kev khiav hauj lwm zaus ntawm lub vibration system, uas yuav tsum nyob ze rau qhov kev cia siab ntawm tus nqi raws li qhov ua tau hauv kev tsim thiab yuav tsum ua kom haum rau qhov chaw ua haujlwm ntawm lub zog.

2) Dynamic tsis kam (R1)

Kev ua haujlwm ntawm cov ceg ntawm lub piezoelectric vibrator yog qhov me me raws li qhov ua tau raws li qhov kev txhawb nqa tib yam! Rau kev tu lossis vuam vibrator, nws feem ntau yog nruab nrab ntawm 5 Ω thiab 20 Ω. Yog tias nws loj dhau lawm, lub vibrator lossis vibration system yuav muaj teeb meem hauv kev ua haujlwm, xws li Circuit Court mismatch, kev hloov pauv tsis zoo, lub neej luv luv ntawm vibrator, thiab lwm yam.

3) Mechanical quality factor (Qm)

Nws yog txiav txim los ntawm txoj kev nkhaus conductance uas Qm=Fs/(F2-F1), qhov siab dua Qm yog, qhov zoo dua, vim tias Qm siab dua, qhov ua tau zoo ntawm vibrator yog siab dua. Txawm li cas los xij, Qm yuav tsum phim cov khoom siv hluav taws xob. Yog tias tus nqi Qm siab dhau lawm, cov khoom siv hluav taws xob tsis tuaj yeem phim. Rau kev ntxuav lub vibrator, qhov siab dua tus nqi Qm, qhov zoo dua. Feem ntau hais lus, Qm rau kev ntxuav lub vibrator yuav tsum yog 500-1000. Yog tias nws qis dhau, kev ua haujlwm ntawm lub vibrator yog qis. Yog tias nws siab dhau lawm, cov khoom siv hluav taws xob tsis tuaj yeem sib phim. Rau ultrasonic vuam lossis ua, Qm tus nqi ntawm lub vibrator nws tus kheej feem ntau yog 50-1000, thiab tag nrho cov system yog 1500-3000. Yog tias nws qis dhau, qhov kev vibration efficiency tsawg, tab sis nws tsis tuaj yeem siab dhau, vim tias qhov siab dua Qm, qhov nqaim ntawm kev ua haujlwm bandwidth, thiab cov khoom siv hluav taws xob yog qhov nyuaj rau kev sib tw, uas yog, cov khoom siv hluav taws xob nyuaj ua haujlwm. ntawm qhov chaw resonant zaus, thiab cov khoom siv tsis tuaj yeem ua haujlwm li qub.

4) Dawb capacitance (CT)

Tus nqi capacitance ntawm cov cuab yeej piezoelectric ntawm zaus ntawm 1kHz yog raws li tus nqi ntsuas los ntawm digital capacitance meter. Tshem tawm qhov dynamic capacitance C1 los ntawm tus nqi no kom tau txais qhov tseeb static capacitance C0, C0=CT-C1. C0 yuav tsum sib npaug nrog inductance thaum siv. Nyob rau hauv Circuit Court tsim ntawm ultrasonic machining tshuab, zoo ntsuas C0 tuaj yeem txhim kho lub zog ntawm cov khoom siv hluav taws xob. Muaj ob txoj hauv kev los siv qhov sib npaug inductance, sib npaug sib npaug thiab sib txuas.

5) Anti resonant zaus (Fp)

Lub resonant zaus ntawm cov ceg sib luag ntawm lub piezoelectric vibrator. Ntawm qhov zaus no, qhov impedance Zmax ntawm piezoelectric vibrator yog loj. Yog hais tias lub anti resonant impedance Zmax tsawg heev, lub vibrator yog faulty.

Ultrasonic transducer

2. Cov duab kos duab

Feem ntau hais lus, kev vibration kev ua tau zoo lossis piezoelectric transducer ntawm kev co tuaj yeem raug txiav txim ncaj qha los ntawm lub logarithmic coordinate diagram, uas yog yooj yim thiab intuitive.

1) Feem ntau, lub voj voog nkag yog ib lub voj voog, thiab lub logarithmic coordinate graph tsuas muaj ib khub ntawm qhov tsawg kawg nkaus thiab qhov siab tshaj plaws.

2) Nyob rau hauv cov xwm txheej txawv txav, muaj ntau lub voj voog me me ntawm lub voj voog nkag, thiab muaj ntau khub ntawm minima thiab maxima ntawm logarithmic coordinate graph.

Nyob rau hauv dab tsi tshwm sim yuav lub voj voog nkag thiab conductance nkhaus ntawm piezoelectric ceramics los yog transducers yuav txawv txav? Feem ntau muaj cov xwm txheej hauv qab no:

1) Piezoelectric ceramics muaj lawv tus kheej cov teeb meem, xws li sab hauv delamination.

2) Lub transducer tau tawg thaum sib dhos.

3) Cov teeb meem tshwm sim hauv kev tsim lossis sib dhos ntawm ultrasonic horn thiab pwm.

4) Qhov chaw nyob ib ncig ntawm qhov kev ntxhov siab sib tsoo vim qhov tsis zoo ntawm cov transducer.