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Bioimpedance MeasurementDept. of Biomedical Engineering YOUNHO HONG
Impedance measure + Z - constant current source i=0 measured knownresistance reactance
Impedance measure (Example) You are given with i(t) = I sin(2πft)1 1+j Re Im i V t 1 You are given with i(t) = I sin(2πft) You measure v(t) = V sin(2πft+θ)
Impedance measure (Example) Z
Impedance measure Z X ? phase-sensitive Demodulation sin(2πft)cos(2πft) phase-sensitive Demodulation
Impedance measure In-phase Component
Impedance measure Quadrature Component
Impedance measure V=VI+jVQ Vsin θ V θ Vcosθ (Quadrature Component)(In-phase Component) (Quadrature Component) V=VI+jVQ
Two-electrode Method Inject current and then measure voltage V I skinequivalent circuit V Inject current and then measure voltage ZC1 ZC2 Zb
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Four-electrode MethodV I skin E1 E3 E4 E2 ZC1 ZC3 Zb1 Zb2 ZC4 ZC2 Zb
Three-electrode MethodV I skin E1 E3 E2 ZC1 ZC3 ZC2 Zb1 Zb We can measure skin impedance using Three and Four electrode Method
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Bio Impedance SpectroscophyZ + - Repeat measurement for many frequencies θ f Zb f
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