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BIOIMPEDANCE MEASUREMENT BIOMEDICAL ENGINEERING 2006200401 TAE_EUI, KIM

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. Impedance. Reactance. Resistor.

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BIOIMPEDANCE MEASUREMENT BIOMEDICAL ENGINEERING 2006200401 TAE_EUI, KIM

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  1. MEDICAL INSTRUMENTATION II BIOIMPEDANCE MEASUREMENT BIOMEDICAL ENGINEERING 2006200401 TAE_EUI, KIM

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

  3. Measurement of Impedance Impedance Reactance Resistor

  4. Measurement of Impedance

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

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

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

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

  9. Measurement of Impedance - In phase component

  10. Measurement of Impedance- Quadrature component

  11. Measurement of Impedance

  12. More Interpretation

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

  14. Two-electrode Method

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

  16. Four-electrode Method

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

  18. Three-electrode Method

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

  20. Noise Effect

  21. Spectrum Analyser

  22. Bio Impedance Spectroscophy

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