ECG thiab Lub Plawv Ntsuas Xyuas: 6 Kauj Ruam

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

Electrocardiogram, tseem hu ua ECG, yog qhov kev ntsuas uas pom thiab sau cia tib neeg lub plawv kev siv hluav taws xob. Nws txheeb xyuas lub plawv dhia thiab lub zog thiab lub sijhawm ntawm cov hluav taws xob cuam tshuam los ntawm txhua ntu ntawm lub plawv, uas tuaj yeem txheeb xyuas cov teeb meem hauv lub plawv xws li mob plawv nres thiab lub plawv dhia tsis xwm yeem. ECG's hauv tsev kho mob cuam tshuam nrog kaum ob qhov hluav taws xob rau ntawm daim tawv nqaij ntawm lub hauv siab, caj npab thiab txhais ceg. Hauv qhov tsis yooj yim no, peb tsuas yog siv peb lub tshuab hluav taws xob, ib qho rau txhua lub dab teg ua ob qhov chaw kaw suab thiab ib qho rau pob taws sab xis raws li hauv av. Nws yog ib qho tseem ceeb kom nco ntsoov tias 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.

Txhawm rau kom tau txais thiab txheeb xyuas tib neeg lub teeb liab ECG, peb xav tau lub ntsuas hluav taws xob ntsuas uas ua kom lub teeb liab nkag los ntawm 1000, lub ntsej muag lim uas tshem tawm cov suab nrov tam sim no (60 Hz) thiab lim qis uas lim lwm lub suab nrov saum 250 Hz. Kev txiav tawm 250Hz tau siv vim tias qhov ntau zaus ntawm tib neeg ECG yog nruab nrab ntawm 0-250Hz

Kauj ruam 1: Cov ntaub ntawv

Lub tshuab hluav taws xob muaj nuj nqi, Lub zog siv hluav taws xob, Oscilloscope, Breadboard.

Resistors: 1k - 500k ohm

Capacitors: 20 - 100 nF

Lub tshuab ua haujlwm x5 (UA741)

Kauj Ruam 2: Tsim Cov Khoom Siv Ua Kom Zoo Tshaj

Xa mus rau lub Circuit Court thiab qhov sib npaug ntawm qhov ntsuas qhov ntsuas. Peb thawj yuav tsum tau suav qhov tseeb resistor qhov tseem ceeb. Txij li qhov ntsuas qhov ntsuas tau muaj 2 theem muaj ob qhov sib txawv, k1 thiab k2. Txij li thaum peb xav tau qhov nce ntawm 1000, k1 sib npaug los ntawm k2 yuav tsum sib npaug rau ib txhiab. Hauv qhov kev qhia no peb siv cov txiaj ntsig hauv qab no, xav hloov pauv cov txiaj ntsig no yog tias koj tsis muaj ntau yam ntawm cov neeg tawm tsam.

R1 = 1000Ω, R2 = 15000Ω, K1 = 1+(2*15000)/1000 = 31R3 = 1000Ω, R4 = 32000Ωhence, K2 = 32000/1000 = 32

Tam sim no koj paub dab tsi resistor qhov tseem ceeb koj xav tau, mus tom ntej thiab ua lub Circuit Court.

Txhawm rau ntsuas qhov ntsuas qhov ntsuas, koj tuaj yeem siv lub tshuab hluav taws xob ua haujlwm los tsim lub sine yoj nrog qhov paub dav, txuas nws mus rau lub tswv yim ntawm Circuit Court thiab txuas cov zis ntawm lub tshuab hluav taws xob mus rau oscilloscope, koj yuav tsum pom aa sine wave nrog qhov dav 1000 zaug loj dua li cov tswv yim sine wave

Kauj Ruam 3: Tsim Ntej Lim

Zoo ib yam li qhov ntsuas qhov ntsuas, xa mus rau Circuit thiab equations kom pom qhov tsim nyog tivthaiv qhov tseem ceeb. Peb paub tias hauv qhov lim dej no, peb yuav tsum txiav tawm zaus ntawm 60Hz yog li f0 yog 60Hz, peb kuj tseem yuav siv qhov zoo ntawm 8 uas yuav ua rau peb raug qhov tseeb. Siv cov txiaj ntsig no peb tam sim no tuaj yeem pom cov khoom tsim nyog tsim nyog:

C = 100 nF, Q = 8, w0 = 2ℼf = 2*pi*60 = 120pi

R1 = 1/(2*8*120*pi*100*10^-9) = 1658Ω

R2 = (2*8)/(120*pi*100*10^-9) = 424kΩ

R3 = (1658*424000)/(1658+424000) = 1651Ω

Tam sim no koj paub qhov tseem ceeb ntawm cov khoom siv uas koj xav tau mus tom ntej thiab tsim cov Circuit Court. Tsis yog tias koj tuaj yeem siv cov neeg tawm tsam sib luag lossis ua ntu zus kom tau txais txiaj ntsig kom ze li sai tau rau qhov txiaj ntsig xav tau.

Txhawm rau ntsuas lub ntsuas phoo, koj tuaj yeem ua qhov nrawm nrawm. Tawm tswv yim sine wave nrog qhov dav ntawm 0.5V thiab sib txawv zaus. Saib seb qhov dav ntawm qhov tso zis uas txuas nrog oscilloscope hloov pauv thaum koj nyob ze rau 60Hz. Piv txwv li thaum koj zaus qis dua 50 lossis siab dua 70 koj yuav tsum pom lub teeb liab tso tawm zoo ib yam li cov tswv yim tab sis qhov ze dua koj mus rau 60Hz qhov dav yuav tsum qis dua. Yog tias qhov no tsis tshwm sim txheeb xyuas koj lub Circuit Court thiab xyuas kom tseeb tias koj siv qhov ntsuas qhov ntsuas raug.

Kauj Ruam 4: Tsim Qhov Kev Txiav Txim Thib Ob Butterworth Lim

Hom lim qis uas peb siv yog qhov ua haujlwm thib ob. Lub lim dej no tau siv vim tias nws muab rau peb kom zoo txaus thiab txawm hais tias nws xav tau lub zog tab sis kev ua tau zoo dua. Lub lim dej tau tsim los txiav tawm cov zaus ntau dua 250 Hz. Qhov no yog vim tias ECG teeb liab muaj qhov sib txawv sib txawv uas nyob nruab nrab ntawm xoom thiab 250 Hz thiab txhua lub teeb liab uas muaj ntau dua 250 Hz yuav suav tias yog suab nrov. Thawj daim duab qhia pom cov txheej txheem ntawm cov lim lim qis nrog txhua qhov raug qhov cuam tshuam qhov tseeb. (Nco ntsoov tias R7 yuav tsum yog 25632Ω hloov 4kΩ). Cov duab thib ob suav nrog txhua qhov kev ua zauv uas koj tuaj yeem siv los laij tus nqi ntawm koj tus kheej.

Txhawm rau ntsuas qhov lim dej qis, siv lub tshuab hluav taws xob ua haujlwm los tsim hluav taws xob sine nrog qhov dav ntawm 0.5V. Thaum nkag mus ntau zaus qis dua 250Hz, koj yuav tsum pom cov zis zoo ib yam li cov tswv yim tab sis qhov loj dua koj tau tom qab 250Hz cov zis yuav tsum tau me dua thiab thaum kawg dhau los ze rau xoom.

Kauj ruam 5: Muab tag nrho ua ke

Tom qab koj ua tiav kev tsim peb theem, muab tag nrho lawv ua ke los ntawm kev tso cov cuab yeej siv suab nrov, ua raws los ntawm lub hauv paus lim, thiab tom qab ntawd lim qis. Koj lub voj voog yuav tsum zoo ib yam li cov duab no.

Kauj Ruam 6: Xeem Lub Circuit Court

Siv lub tshuab hluav taws xob ua haujlwm, tawm tswv yim pom zoo ECG teeb liab nrog qhov dav ntawm qhov tsis loj dua 15mV rau cov tswv yim ntawm lub ntsuas qhov ntsuas. Txuas qhov tso tawm ntawm cov lim qis dhau mus rau oscilloscope. Koj yuav tsum tau txais cov zis zoo ib yam li cov duab no. Lub teeb liab ntsuab yog qhov tso tawm ntawm lub rooj tsavxwm thiab lub teeb liab yog lub teeb liab nkag mus rau hauv Circuit Court. Koj kuj tseem tuaj yeem ntsuas lub plawv dhia los ntawm kev tau txais cov zaus siv oscilloscope thiab muab tus lej ntawd sib npaug 60.

Nco ntsoov tias yog tias koj xav ntsuas koj tus kheej lub teeb liab ECG koj tuaj yeem ua li ntawd los ntawm kev txuas ob lub tswv yim ntawm cov cuab yeej ntsuas suab rau txhua tus ntawm koj lub dab teg siv hluav taws xob thiab ua rau koj txhais ceg. Tsuas yog ua kom nyob nruab nrab ua ntej ua qhov no kom ntseeg tau tias lub Circuit Court thiab Circuit-to-instrument txuas tau siv cov txheej txheem cais tawm kom raug.