• Christoph Zysset, Nassim Nasseri, Lars Büthe, Niko Münzenrieder, Thomas Kinkeldei, Luisa Petti, Stefan Kleiser, Giovanni A Salvatore, Martin Wolf, and Gerhard Tröster.
• Electronics Laboratory, Swiss Federal Institute of Technology, Gloriastrasse 35, 8092 Zürich, Switzerland. zysset@ife.ee.ethz.ch
• Opt Express. 2013 Feb 11;21(3):3213-24.

AbstractBeing the closest layer to our body, textiles provide an ideal platform for integrating sensors and actuators to monitor physiological signals. We used a woven textile to integrate photodiodes and light emitting diodes. LEDs and photodiodes enable near-infrared spectroscopy (NIRS) systems to monitor arterial oxygen saturation and oxygenated and deoxygenated hemoglobin in human tissue. Photodiodes and LEDs are mounted on flexible plastic strips with widths of 4 mm and 2 mm, respectively. The strips are woven during the textile fabrication process in weft direction and interconnected with copper wires with a diameter of 71 μm in warp direction. The sensor textile is applied to measure the pulse waves in the fingertip and the changes in oxygenated and deoxygenated hemoglobin during a venous occlusion at the calf. The system has a signal-to-noise ratio of more than 70 dB and a system drift of 0.37% ± 0.48%. The presented work demonstrates the feasibility of integrating photodiodes and LEDs into woven textiles, a step towards wearable health monitoring devices.

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