Journal
BIOSENSORS & BIOELECTRONICS
Volume 26, Issue 1, Pages 80-86Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2010.05.013
Keywords
Wearable braincap; Contactless sensor; Brain-computer interface; Ambient-assisted living
Categories
Funding
- Center Algoritmi
- Portuguese Foundation for Science and Technology [SFRH/BD/42705/2007, SFRH/BD/21529/2005, SFRH/BD/39459/2007]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/21529/2005, SFRH/BD/42705/2007, SFRH/BD/39459/2007] Funding Source: FCT
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Wearable devices are used to record several physiological signals, providing unobtrusive and continuous monitoring These systems are of particular interest for applications such as ambient-assisted living (AAL), which deals with the use of technologies. like brain-computer Interface (BCI) The main challenge in these applications is to develop new wearable solutions for acquisition of electroenchephalogram (EEG) signals Conventional solutions based on brain caps, are difficult and uncomfortable to wear. This work presents a new optical fiber biosensor based on electro-active gel - polyacrylamide (PAAM) hydrogel with the ability to measure the required EEG signals and whose technology principle leads to contactless electrodes. Experiments were performed in order to evaluate the electro-active properties of the hydrogel and its frequency response, using an electric and optical setup A sinusoidal electric field was applied to the hydrogel while the light passes through the sample An optical detector was used to collect the resultant modulated light The results have shown an adequate sensitivity in the range of mu V, as well as a good frequency response, pointing the PAAM hydrogel sensor as an eligible sensing component for wearable biopotential recording applications. (C) 2010 Elsevier B.V. All rights reserved
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