Development of high time resolution measurement system of frequency characteristics in bioelectrical impedance for biodynamic analysis

Takao Nakamura, Toshimasa Kusuhara, Yoshitake Yamamoto

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

We have proposed biodynamic analysis using bioelectrical impedance at 50 kHz, which is measured with synchronous rectification method. In order to analyze impedance parameters in biodynamics, the measurement of frequency characteristics in bioelectrical impedance with a high time resolution are required. Therefore we have developed a high time resolution measurement system for bioelectrical impedance with 10 frequency points and time resolution of 1 ms. A voltage EA, which consisted of fundamental wave and 9 kinds of harmonic wave from 1 kHz to 1 MHz, were converted to current. The current flowed through human body and a potential voltage, EV was detected in the measured part. After A/D conversion of EV and EA in the sampling frequency 2 MHz, data number 2048 points, the impedance were calculated using Fast Fourier Transform. The measured time 1.024 ms was the period of the fundamental wave and time resolution of this system. The specification is enough accuracy for measurement of bioelectrical impedance for biodynamic analysis.

Keywords

  • Biodynamic analysis
  • Bioelectrical impedance
  • Frequency characteristics
  • High time resolution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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