Wearable Bioimpedance Hydration Monitoring System Using Conformable AgNW Electrodes

Sponsored by IEEE Sensors Council (ieee-sensors.org/)
Title: Wearable Bioimpedance Hydration Monitoring System Using Conformable AgNW Electrodes
Author: Tanner Songkakul{1}, Shuang Wu{1}, Parvez Ahmmed{1}, William D. Reynolds Jr.{2}, Yong Zhu{1}, Alper Bozkurt{1}
Affiliation: {1}North Carolina State University, United States; {2}Onda Vision Technologies, United States
Abstract: Monitoring hydration level could be vital for maintaining physiological and cognitive performance during physical exertion and thermal stress. We present a miniaturized, custom and wearable bioimpedance spectroscopy (BIS) system consisting of a Bluetooth-enabled system-on-a-chip and an analog front-end circuit that is integrated with conformable, flexible, and stretchable silver-nanowire electrodes. This system is capable of performing four-electrode BIS at a range of frequencies between 5 kHz and 195 kHz, transmitting the data wirelessly to a data aggregator, and configuring the front-end circuit parameters over-the-air when needed. A 150 mAh lithium polymer battery can power the system for 18 hours. In this study, proof-of-concept in-vitro validation of the system generated promising results.
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