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

Takao Nakamura; Toshimasa Kusuhara; Yoshitake Yamamoto

doi:10.1117/12.717000

24 October 2006 Development of high time resolution measurement system of frequency characteristics in bioelectrical impedance for biodynamic analysis

Takao Nakamura, Toshimasa Kusuhara, Yoshitake Yamamoto

Author Affiliations +

Proceedings Volume 6357, Sixth International Symposium on Instrumentation and Control Technology: Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence; 63571S (2006) https://doi.org/10.1117/12.717000
Event: Sixth International Symposium on Instrumentation and Control Technology, 2006, Beijing, China

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 E_A, which consisted of fundamental wave and 9 kinds of harmonic wave from 1 kHz to 1MHz, 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 E_A 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.

Citation Download Citation

Takao Nakamura, Toshimasa Kusuhara, and Yoshitake Yamamoto "Development of high time resolution measurement system of frequency characteristics in bioelectrical impedance for biodynamic analysis", Proc. SPIE 6357, Sixth International Symposium on Instrumentation and Control Technology: Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence, 63571S (24 October 2006); https://doi.org/10.1117/12.717000

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