University of Oulu

J. Kilpijärvi, J. Tolvanen, J. Juuti, N. Halonen and J. Hannu, "A Non-Invasive Method for Hydration Status Measurement With a Microwave Sensor Using Skin Phantoms," in IEEE Sensors Journal, vol. 20, no. 2, pp. 1095-1104, 15 Jan.15, 2020.

A non-invasive method for hydration status measurement with a microwave sensor using skin phantoms

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Author: Kilpijärvi, J.1; Tolvanen, J.1; Juuti, J.1;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2019-12-09


Fluid balance is important for a healthy human being. In this paper, a method to measure hydration status was developed and tested towards non-invasive measurement from human skin. Measurement of hydration status was performed by a microwave sensor utilizing a complementary split ring resonator (CSRR). The sensor was modeled, manufactured and then characterized by measuring tailor made skin phantoms based on the realistic electrical properties of skin with different degrees of hydration status. Qualitative longer term (>24 h) evaluation of the sensor was also performed by measuring polyester tissue that was drying over the time. Hydration status, represented by dehydrated, normal and hydrated skin phantoms, based on polyurethane with carbon and ceramic additives, was measured successfully by monitoring the changes in resonance frequency around 5.52 GHz. All results were compared to the dielectric reference measurements done by a commercial laboratory instrument.

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Series: IEEE sensors journal
ISSN: 1530-437X
ISSN-E: 1558-1748
ISSN-L: 1530-437X
Volume: 20
Issue: 2
Pages: 1095 - 1104
DOI: 10.1109/JSEN.2019.2945817
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by Proof of concept (POC) funding, University of Oulu. The Center of Microscopy and Nanotechnology at the University of Oulu is acknowledged for technical support. Authors wish to thank Fab Lab Oulu for access to the CNC router. J. K. would like to acknowledge support of the Tauno Tönning Foundation.
Copyright information: © The Authors 2019. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see