ECG Circuit: 7 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:29

Ib qho ECG yog ntsuas uas ntsuas lub zog hluav taws xob ntawm lub plawv los ntawm kev kaw lub plawv lub plawv dhia thiab ua haujlwm. Nws ua haujlwm los ntawm kev nyeem thiab nyeem cov cim los ntawm lub plawv siv cov hlau lead uas txuas nrog lub tshuab electrocardiograph. Cov Lus Qhia no yuav qhia koj yuav ua li cas tsim cov phiaj xwm uas kaw, lim, thiab qhia txog lub teeb liab hluav taws xob ntawm lub plawv. Qhov no tsis yog khoom siv kho mob. Qhov no yog rau lub hom phiaj kev kawm tsuas yog siv cov cim ntsuas. Yog tias siv qhov kev ntsuas no rau kev ntsuas ECG tiag tiag, thov xyuas kom lub Circuit Court thiab Circuit-to-instrument txuas tau siv cov txheej txheem cais tawm kom raug.

Lub voj voog no muaj peb theem sib txawv ua ke ua ke nrog LabView program. Cov neeg tawm tsam hauv lub tshuab ntsuas qhov ntsuas tau suav nrog qhov nce ntawm 975 kom ntseeg tau tias cov cim me me los ntawm lub plawv tseem tuaj yeem khaws tau hauv Circuit Court. Lub taub lim lim tawm tawm 60 Hz suab nrov los ntawm lub qhov hluav taws xob hauv phab ntsa. Cov lim qis dhau ua kom ntseeg tau tias lub suab nrov nrov tau raug tshem tawm ntawm Circuit Court kom pom lub teeb liab zoo dua.

Ua ntej pib qhov kev qhia no, nws yuav pab tau kom koj paub koj tus kheej nrog uA741 Lub Hom Phiaj Ua Haujlwm Lub Hwjchim Loj Cov pins sib txawv hauv op-amp muaj lub hom phiaj sib txawv thiab lub Circuit Court yuav tsis ua haujlwm yog tias lawv txuas nrog tsis raug. Kev txuas cov pins rau lub khob cij tsis raug cai kuj tseem yog txoj hauv kev yooj yim rau kib op-amp thiab ua rau nws tsis ua haujlwm. Qhov txuas hauv qab no muaj cov txheej txheem siv rau op-amps hauv cov lus qhia no.

Qhov Duab Duab:

Kauj Ruam 1: Sau Cov Khoom

Cov ntaub ntawv xav tau rau txhua 3 theem ntawm lim:

• Oscilloscope
• Muaj nuj nqi generator
• Fais fab mov (+15V, -15V)
• Solderless breadboard
• Ntau cov txiv tsawb kab thiab cov nab kuab
• ECG Electrode Stickers
• Ntau cov xov hlau jumper

Kev ntsuas suab nrov:

• 3 Op-amps (uA741)

• Resistors:

  • 1k3x wb
  • 12k2x wb
  • 39k2x wb

Ntim Lim:

• 1 Op-amp (uA741)

• Resistors:

  • 1,6kx 2
  • 417k ua

• Capacitors:

  • 100 nf x2
  • 200nf ua

Tsawg Pass Lim:

• 1 Op-Amp (uA741)

• Resistors:

  • 23,8k wb
  • 43k ua

• Capacitors:

  • 22 nxf
  • 47n fwv

Kauj Ruam 2: Tsim Cov Khoom Siv Amplifier

Cov cim qhia txog roj ntsha feem ntau tsuas yog tso tawm hluav taws xob nruab nrab ntawm 0.2 thiab 2 mV [2]. Cov hluav taws xob no tsawg dhau los tshuaj xyuas ntawm oscilloscope yog li peb xav tau los tsim lub tshuab hluav taws xob.

Tom qab koj lub Circuit tsim, ntsuas kom paub tseeb tias nws ua haujlwm tau zoo los ntawm kev ntsuas qhov hluav taws xob ntawm Vout (qhia raws li node 2 hauv daim duab saum toj no). Peb siv lub tshuab hluav taws xob ua haujlwm kom xa lub sine wave nrog cov lus tso tawm qhov siab ntawm 20 mV rau peb cov cuab yeej siv suab nrov. Txhua yam dhau deb tshaj qhov no yuav tsis muab rau koj qhov txiaj ntsig koj tab tom nrhiav vim tias op amps tsuas yog tau txais qee lub zog ntawm -15 thiab +15 V. Sib piv cov txiaj ntsig ntawm lub tshuab hluav taws xob ua haujlwm rau lub zog ntawm koj lub cuab yeej ntsuas thiab nrhiav kom tau qhov ze ntawm 1000 V. (Vout/Vin yuav tsum ze heev rau 1000).

Lub tswv yim rau kev daws teeb meem: Xyuas kom tseeb tias txhua tus tiv thaiv nyob hauv kΩ ntau.

[2] “Kev Ua Tau Zoo Electrocardiogram (ECG) Teeb Pom Kev Kho Mob | Kev Kawm | Cov khoom siv analog. " [Online]. Muaj: https://www.analog.com/en/education/education-library/articles/high-perf-electrocardiogram-signal-conditioning.html. [Tau txais: 10-Dec-2017].]

Kauj Ruam 3: Tsim Ntej Lim

Peb lub ntsej muag lim tau tsim los lim tawm zaus ntawm 60 Hz. Peb xav lim tawm 60 Hz los ntawm peb lub teeb liab vim tias yog qhov hloov pauv tam sim no pom hauv cov hluav taws xob.

Thaum sim ntsuas lub ntsuas phoo, ntsuas qhov siab tshaj-rau-ncov sib piv ntawm cov tswv yim thiab cov duab tso tawm. Ntawm 60 Hz, yuav tsum muaj qhov sib piv ntawm -20 dB lossis zoo dua. Qhov no vim tias ntawm -20 dB, qhov hluav taws xob tso tawm yog qhov tseem ceeb 0V, txhais tau tias koj ua tiav lim tawm lub teeb liab ntawm 60 Hz! Kuaj zaus ib puag ncig 60 Hz ib yam thiab kom paub tseeb tias tsis muaj lwm zaus uas tau raug lim tawm.

Lub tswv yim rau kev daws teeb meem: Yog tias koj tsis tuaj yeem tau txais -20dB ntawm 60 Hz, xaiv ib tus tiv thaiv thiab hloov nws me ntsis kom txog thaum koj tau txais cov txiaj ntsig xav tau. Peb yuav tsum ua si ib puag ncig nrog tus nqi R2 kom txog thaum peb tau txais cov txiaj ntsig uas peb xav tau.

Kauj Ruam 4: Tsim Tsawg Pass Lim

Peb lub lim qis dhau tau tsim los nrog kev txiav tawm ntawm 150 Hz. Peb xaiv qhov kev txiav tawm no vim tias qhov ntsuas dav tshaj plaws rau ECG yog 0.05 Hz - 150 Hz, piv txwv tias tsis muaj suab nrov thiab tsis muaj suab nrov ib puag ncig [3]. Lub lim qis dhau tuaj yeem tshem tawm lub suab nrov nrov los ntawm cov leeg lossis lwm qhov ntawm lub cev [4].

Txhawm rau ntsuas qhov Circuit no kom ntseeg tau tias nws ua haujlwm tau zoo, ntsuas Vout (qhia raws li node 1 hauv daim duab qhia chaw). Ntawm 150 Hz, qhov dav ntawm lub teeb liab tso tawm yuav tsum yog 0.7 npaug qhov dav ntawm cov teeb liab tawm tswv yim. Peb siv lub teeb liab nkag los ntawm 1V txhawm rau kom pom tau yooj yim tias peb cov zis yuav tsum yog 0.7 ntawm 150 Hz.

Cov lus qhia rau kev daws teeb meem: tsuav koj qhov kev txiav tawm tsis pub dhau ob peb Hz ntawm 150 Hz koj lub Circuit tseem yuav tsum ua haujlwm. Peb qhov kev txiav tawm xaus li 153 Hz. Qhov ntau rau cov cim qhia txog roj ntsha yuav hloov pauv me ntsis hauv lub cev yog tias tsuav koj tsis tawm ntau dua li ob peb Hz, koj lub Circuit tseem yuav ua haujlwm ntxiv.

[3] “ECG Lim | MEDTEQ. " [Online]. Muaj: https://www.medteq.info/med/ECGFilters. [Tau txais: 10-Dec-2017].

[4] KL Venkatachalam, JP E. Arrhythmia Electrophysiol, vol. 4, tsis muaj. 6, pp. 965-973, Kaum Ob Hlis 2011.

Kauj Ruam 5: Tsim LabView Program

[5] "BME 305 Tsim Lab Project" (Caij nplooj zeeg 2017).

Daim duab ntsuas ntsuas ntsuas kab mob no tau tsim los tshuaj xyuas lub teeb liab mus los ntawm txoj haujlwm, txheeb xyuas ECG qhov siab tshaj plaws, sau lub sijhawm sib txawv ntawm qhov siab tshaj, thiab laij lej BPM. Nws kuj tseem nthuav tawm daim duab ntawm ECG cov duab.

Kauj Ruam 6: Txuas Tag Nrho Peb Theem

Txuas tag nrho peb qhov kev sib txuas ua ke los ntawm kev txuas cov khoom siv ntawm lub tshuab ntsuas hluav taws xob mus rau cov tswv yim ntawm lub hauv paus lim thiab tso tawm ntawm lub ntsej muag lim rau cov tswv yim ntawm lim qis. Txuas cov txiaj ntsig ntawm cov lim qis dhau mus rau tus pabcuam DAQ thiab txuas tus pabcuam DAQ rau lub khoos phis tawj. Thaum txuas cov kab hluav taws xob ua ke, xyuas kom tseeb tias cov hlua hluav taws xob rau txhua daim ntawv tais tau sib txuas thiab cov kab hauv av tau txuas nrog tib lub dav hlau hauv av.

Hauv qhov ntsuas qhov ntsuas qhov ntsuas, qhov thib ob op-amp yuav tsum tau ua kom tsis txhob xau kom ob lub tshuab hluav taws xob coj mus txuas nrog rau qhov kev xeem tuaj yeem tuaj yeem txuas mus rau qhov sib txawv op amp hauv thawj theem ntawm lub lim ntawd.

Kauj Ruam 7: Tau Txais Cov Teeb Meem Los Ntawm Tib Neeg Cov Ntsiab Lus

Ib daim nplaum nplaum yuav tsum tau muab tso rau ntawm txhua lub dab teg, thiab ib qho yuav tsum tau muab tso rau ntawm pob taws rau hauv av. Siv cov nab kuab txuas los txuas ob lub xov tooj hluav taws xob rau cov khoom siv ntawm lub tshuab ua kom nrov nrov thiab pob taws rau hauv av. Thaum npaj txhij, nyem "khiav" ntawm qhov program LabView thiab pom koj lub plawv dhia thiab ECG ntawm qhov screen!