Passive Sensing for the Internet of Medical Things : A Low-Cost Battery-Less Wearable Sweat Rate Sensor
López-Soriano, Sergio (Universitat Oberta de Catalunya. Internet Interdisciplinary Institute (IN3))
Parrón Granados, Josep (Universitat Autònoma de Barcelona. Departament de Telecomunicació i Enginyeria de Sistemes)
Melià-Seguí, Joan (Universitat Oberta de Catalunya)

Date:	2025
Abstract:	Continuous monitoring of the sweat rate can support the early diagnosis of several chronic diseases such as Parkinson's or diabetes. However, current wearable wireless devices use batteries that have a limited operating time, also increasing their cost, and thus, reducing their accessibility to a large part of the population. In that sense, passive IoT technologies could be exploited to produce battery-less low-cost antenna-based sensors (ABS). In this paper, we propose a UHF RFID battery-less antenna-based sensor that transforms the amount of sweat accumulated inside a microfluidic channel into a variation of the tag response. In order to provide multi-level sensing, we rely on the IC self-tuning sensor code, which is passively backscattered to the reader unit, instead of channel information which may provide insufficient resolution depending on the geographical location. The sensor performance is validated experimentally, achieving an accuracy of 90% in the estimation of the sweat loss and 95% in the estimation of the average sweat rate.
Grants:	Agencia Estatal de Investigación PID2021-122247OB-I00 Agencia Estatal de Investigación PID2021-127203OB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00174
Note:	Altres ajuts: TECNIO EXP under Grant URD250/23
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Microfluidics ; RFID ; Antenna-based sensor ; Sweat loss ; Sweat rate ; SDG 3 - Good Health and Well-being
Published in:	IEEE Internet of Things Journal, Vol. 12, Issue 8 (April 2025) , p. 10655-10663, ISSN 2327-4662

DOI: 10.1109/JIOT.2024.3514298

9 p, 6.3 MB

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