MEDICAL INSTRUMENTATION II BIOIMPEDANCE MEASUREMENT

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Presentation transcript:

MEDICAL INSTRUMENTATION II BIOIMPEDANCE MEASUREMENT BIOMEDICAL ENGINEERING 2006200401 TAE_EUI, KIM

Measurement of Resistor Measured known CCS No matter whether AC or DC, Able to measure fixed R

Measurement of Impedance Reactance Resistor

Measurement of Impedance

Measurement of Impedance Changed with Freq. Resistance at Impedance Reactance at Impedance

Measurement of Impedance changed Not changed Both changed R, C can be found Two equations and Two unknown variables We can calculate

Measurement of Impedance Two equations and Three unknown variables We can calculate at multi freq.

Phase-sensitive Demodulation Our goal is to find Voltage & Theta We have two components, We can separate by using Phase-sensitive Demodulation.

Measurement of Impedance - In phase component

Measurement of Impedance - Quadrature component

Measurement of Impedance

More Interpretation

Two-electrode Method Need to think about interface Electrode Contact interface phenomenon Skin

Two-electrode Method

Two-electrode Method i(t) v(t) v(t) sin v(t) cos

Four-electrode Method

Four-electrode Method i(t) v(t) v(t) sin v(t)c os

Three-electrode Method

Three-electrode Method i(t) v(t) v(t) sin v(t) cos

Noise Effect

Spectrum Analyser

Bio Impedance Spectroscophy

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