{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:22:16Z","timestamp":1760239336187,"version":"build-2065373602"},"reference-count":59,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2020,11,9]],"date-time":"2020-11-09T00:00:00Z","timestamp":1604880000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004298","name":"Secom Science and Technology Foundation","doi-asserted-by":"publisher","award":["SECOM science and technology foundation"],"award-info":[{"award-number":["SECOM science and technology foundation"]}],"id":[{"id":"10.13039\/501100004298","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001700","name":"Ministry of Education, Culture, Sports, Science and Technology","doi-asserted-by":"publisher","award":["Private University Research Branding Project"],"award-info":[{"award-number":["Private University Research Branding Project"]}],"id":[{"id":"10.13039\/501100001700","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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\u2019s resistance and each coupling\u2019s 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\u201310.0 k\u03a9 were less than 5%.<\/jats:p>","DOI":"10.3390\/s20216392","type":"journal-article","created":{"date-parts":[[2020,11,9]],"date-time":"2020-11-09T19:08:29Z","timestamp":1604948909000},"page":"6392","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Capacitive-Coupling Impedance Spectroscopy Using a Non-Sinusoidal Oscillator and Discrete-Time Fourier Transform: An Introductory Study"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2186-5527","authenticated-orcid":false,"given":"Tomiharu","family":"Yamaguchi","sequence":"first","affiliation":[{"name":"Department of Electrical and Electronic Engineering, Tokyo Denki University, Tokyo 120-8551, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5710-1721","authenticated-orcid":false,"given":"Akinori","family":"Ueno","sequence":"additional","affiliation":[{"name":"Department of Electrical and Electronic Engineering, Tokyo Denki University, Tokyo 120-8551, Japan"}]}],"member":"1968","published-online":{"date-parts":[[2020,11,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"66","DOI":"10.1021\/acsaem.9b01965","article-title":"Electrochemical impedance spectroscopy of metal oxide electrodes for energy applications","volume":"3","author":"Brear","year":"2020","journal-title":"ACS Appl. 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