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Capacitive-Coupling Impedance Spectroscopy Using a Non-Sinusoidal Oscillator and Discrete-Time Fourier Transform: An Introductory Study

Department of Electrical and Electronic Engineering, Tokyo Denki University, Tokyo 120-8551, Japan
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Author to whom correspondence should be addressed.
Sensors 2020, 20(21), 6392; https://doi.org/10.3390/s20216392
Received: 4 October 2020 / Revised: 31 October 2020 / Accepted: 8 November 2020 / Published: 9 November 2020
(This article belongs to the Section Intelligent Sensors)
In this study, we propose a new short-time impedance spectroscopy method with the following three features: (1) A frequency spectrum of complex impedance for the measured object can be obtained even when the measuring electrodes are capacitively coupled with the object and the precise capacitance of the coupling is unknown; (2) the spectrum can be obtained from only one cycle of the non-sinusoidal oscillation waveform without sweeping the oscillation frequency; and (3) a front-end measuring circuit can be built, simply and cheaply, without the need for a digital-to-analog (D-A) converter to synthesize elaborate waveforms comprising multiple frequencies. We built the measurement circuit using the proposed method and then measured the complex impedance spectra of 18 resistive elements connected in series with one of three respective capacitive couplings. With this method, each element’s resistance and each coupling’s capacitance were estimated independently and compared with their nominal values. When the coupling capacitance was set to 10 nF or 1.0 nF, estimated errors for the resistive elements in the range of 2.0–10.0 kΩ were less than 5%. View Full-Text
Keywords: capacitive coupling; impedance spectroscopy; non-sinusoidal oscillator; DFT capacitive coupling; impedance spectroscopy; non-sinusoidal oscillator; DFT
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MDPI and ACS Style

Yamaguchi, T.; Ueno, A. Capacitive-Coupling Impedance Spectroscopy Using a Non-Sinusoidal Oscillator and Discrete-Time Fourier Transform: An Introductory Study. Sensors 2020, 20, 6392. https://doi.org/10.3390/s20216392

AMA Style

Yamaguchi T, Ueno A. Capacitive-Coupling Impedance Spectroscopy Using a Non-Sinusoidal Oscillator and Discrete-Time Fourier Transform: An Introductory Study. Sensors. 2020; 20(21):6392. https://doi.org/10.3390/s20216392

Chicago/Turabian Style

Yamaguchi, Tomiharu, and Akinori Ueno. 2020. "Capacitive-Coupling Impedance Spectroscopy Using a Non-Sinusoidal Oscillator and Discrete-Time Fourier Transform: An Introductory Study" Sensors 20, no. 21: 6392. https://doi.org/10.3390/s20216392

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