Cov txheej txheem:
- Kauj Ruam 1: Tsim Cov Khoom Siv Hluav Taws Xob
- Kauj Ruam 2: Tsim Lub Tshuab Ntsis
- Kauj Ruam 3: Tsim Lub Lim Dej Tsawg
- Kauj Ruam 4: Kuaj Circuit Court
- Kauj Ruam 5: ECG Circuit ntawm LabView
- Kauj Ruam 6: ECG thiab Lub plawv dhia
Video: Yuav Ua Li Cas Tsim ECG thiab Lub Plawv Tus Kheej Digital Saib: 6 Kauj Ruam
2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:29
Ib qho electrocardiogram (ECG) ntsuas cov hluav taws xob ua haujlwm ntawm lub plawv dhia los qhia tias lub plawv dhia nrawm npaum li cas thiab nws lub suab sib dhos li cas. Muaj lub tshuab hluav taws xob, tseem hu ua nthwv dej, uas taug kev hla lub plawv los ua kom lub plawv leeg tso ntshav tawm nrog txhua qhov kev ntaus. Txoj cai thiab sab laug atria tsim thawj P nthwv dej, thiab txoj cai thiab sab laug hauv qab ua rau lub QRS nyuaj. Qhov T kawg kawg yog los ntawm kev rov qab hluav taws xob mus rau lub xeev so. Cov kws kho mob siv cov cim ECG los kuaj mob plawv, yog li nws tseem ceeb kom tau txais cov duab meej.
Lub hom phiaj ntawm cov lus qhia no yog kom tau thiab lim lub tshuab hluav taws xob electrocardiogram (ECG) teeb liab los ntawm kev sib txuas cov cuab yeej ntsuas qhov ntsuas, ntsuas lub hauv siab, thiab lim qis hauv lub Circuit Court. Tom qab ntawd cov cim qhia yuav dhau los ntawm A/D hloov pauv mus rau LabView los tsim lub teeb duab lub sijhawm thiab lub plawv dhia hauv BPM.
"Qhov no tsis yog cuab yeej siv kho mob. Qhov no yog rau lub hom phiaj kev kawm nkaus xwb siv cov cim ntsuas. Yog tias siv lub voj voog no rau kev ntsuas ECG tiag, thov xyuas kom lub Circuit Court thiab Circuit-to-instrument txuas tau siv cov txheej txheem cais tawm kom raug."
Kauj Ruam 1: Tsim Cov Khoom Siv Hluav Taws Xob
Txhawm rau tsim qhov ntsuas qhov ntsuas, peb xav tau 3 op amps thiab 4 qhov sib txawv sib txawv. Ib qho cuab yeej siv tshuab ua kom lub zog nce ntxiv ntawm cov nthwv dej tso tawm. Rau qhov kev tsim qauv no, peb tsom mus rau qhov nce ntawm 1000V kom tau txais lub teeb liab zoo. Siv cov kab zauv hauv qab no los laij cov tshuaj tiv thaiv uas tsim nyog qhov twg K1 thiab K2 tau txais txiaj ntsig.
Theem 1: K1 = 1 + (2R2/R1)
Theem 2: K2 = -(R4/R3)
Rau qhov kev tsim no, R1 = 20.02Ω, R2 = R4 = 10kΩ, R3 = 10Ω tau siv.
Kauj Ruam 2: Tsim Lub Tshuab Ntsis
Qhov thib ob, peb yuav tsum tsim lub thais lim siv lub op amp, resistors, thiab capacitors. Lub hom phiaj ntawm cov khoom siv no yog lim tawm suab nrov ntawm 60 Hz. Peb xav lim raws nraim ntawm 60 Hz, yog li txhua yam hauv qab no thiab siab dua qhov zaus no yuav dhau mus, tab sis qhov dav ntawm qhov nthwv dej yuav qis tshaj ntawm 60 Hz. Txhawm rau txiav txim siab qhov ntsuas ntawm qhov lim, peb tau siv qhov nce ntawm 1 thiab qhov ua tau zoo ntawm 8. Siv qhov sib npaug hauv qab no los xam qhov tsim nyog resistor qhov tseem ceeb. Q yog qhov ua tau zoo, w = 2*pi*f, f yog qhov nruab nrab zaus (Hz), B yog bandwidth (rad/sec), thiab wc1 thiab wc2 yog qhov txiav tawm zaus (rad/sec).
R1 = 1/(2QwC)
R2 = 2Q/(wC)
R3 = (R1+R2)/(R1+R2)
Q = w/B.
B = wc2 - wc1
Kauj Ruam 3: Tsim Lub Lim Dej Tsawg
Lub hom phiaj ntawm cov khoom siv no yog lim tawm cov zaus ntau dua ib qho kev txiav tawm ib ntus (wc), qhov tseem ceeb tsis pub lawv hla mus. Peb txiav txim siab lim dej ntawm 250 Hz zaus txhawm rau zam kev txiav ze ze rau qhov nruab nrab zaus siv los ntsuas lub teeb liab ECG (150 Hz). Txhawm rau xam cov txiaj ntsig peb yuav siv rau cov khoom siv no, peb yuav siv cov kab zauv hauv qab no:
C1 <= C2 (a^2 + 4b (k-1)) / 4b
C2 = 10/txiav tawm zaus (Hz)
R1 = 2 / (wc (a*C2 + (a^2 + 4b (k -1) C2^2 - 4b*C1*C2)^(1/2))
R2 = 1 / (b*C1*C2*R1*wc^2)
Peb yuav teeb tsa qhov nce li 1, yog li R3 dhau los ua qhov qhib Circuit Court (tsis muaj tus tiv thaiv) thiab R4 dhau los ua hluav taws xob luv (tsuas yog xaim).
Kauj Ruam 4: Kuaj Circuit Court
Ib qho kev cheb AC tau ua rau txhua qhov kev txiav txim siab ua haujlwm ntawm lub lim. AC cheb ntsuas qhov loj ntawm cov khoom siv ntawm ntau zaus. Koj cia siab tias yuav pom cov duab sib txawv nyob ntawm cov khoom siv. Qhov tseem ceeb ntawm AC cheb yog kom ntseeg tau tias lub Circuit Court ua haujlwm tau zoo ib zaug. Txhawm rau ua qhov kev sim no hauv chav sim, tsuas sau Vout/Vin ntawm ntau qhov ntau zaus. Rau qhov ntsuas qhov ntsuas peb tau ntsuas los ntawm 50 txog 1000 Hz kom tau txais ntau yam. Txog qhov ntsuas qhov ntsuas, peb sim los ntawm 10 txog 90 Hz kom tau txais lub tswv yim zoo ntawm qhov kev tivthaiv li cas nyob ib ncig ntawm 60 Hz. Rau qhov lim qis dhau, peb tau sim los ntawm 50 txog 500 Hz kom nkag siab tias lub Circuit Court ua li cas thaum nws txhais tau tias yuav hla thiab thaum nws txhais tau tias yuav tsum nres.
Kauj Ruam 5: ECG Circuit ntawm LabView
Tom ntej no, koj xav tsim daim duab thaiv hauv LabView uas simulates ECG teeb liab los ntawm A/D hloov pauv thiab tom qab ntawd teeb lub teeb liab ntawm lub khoos phis tawj. Peb pib los ntawm kev teeb tsa qhov ntsuas ntawm peb daim phiaj DAQ teeb tsa los ntawm kev txiav txim siab nruab nrab lub plawv peb xav tau; peb xaiv 60 tus neeg ntaus ib feeb. Tom qab ntawd siv qhov zaus ntawm 1kHz, peb tuaj yeem txiav txim siab tias peb xav tau los ua kom pom qhov ntxhib 3 vib nas this kom tau txais 2-3 ECG qhov siab tshaj hauv cov phiaj xwm yoj. Peb tso tawm 4 vib nas this kom ntseeg tau tias peb ntes tau ECG qhov siab tshaj. Daim duab thaiv kab ntawv yuav nyeem lub teeb liab nkag mus thiab siv lub ncov kom pom tseeb txhawm rau txiav txim siab ntau npaum li cas lub plawv dhia tshwm sim.
Kauj Ruam 6: ECG thiab Lub plawv dhia
Siv cov cai los ntawm daim duab thaiv, ECG yuav tshwm nyob rau hauv lub thawv yoj yoj, thiab cov neeg ntaus ib feeb yuav tshwm nyob ib sab ntawm nws. Tam sim no koj muaj lub plawv dhia ua haujlwm saib xyuas! Txhawm rau tawm tsam koj tus kheej ntau dua, sim siv koj lub Circuit Court thiab hluav taws xob los tso saib koj lub plawv dhia lub sijhawm tiag!
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