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Proceedings Paper

Piezoresistive sensors for smart textiles
Author(s): Paul Calvert; Prabir Patra; Te-Chen Lo; Chi H. Chen; Amit Sawhney; Animesh Agrawal
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Paper Abstract

We have used inkjet printing to deposit silver conducting lines and small PEDOT (conducting polymer) sensors onto fabrics. The printed conductors penetrate into the fabric and can be shown to coat the individual fibers within the yarn, through the full thickness of the cloth. The PEDOT sensor has a resistance in the region of a few kilo-ohms and is connected to measuring equipment by printed silver lines with a resistance of a few ohms. In this way, local strains can be measured at different sites on a fabric. The PEDOT responds to a tensile strain by a reduction in resistance with a gauge factor (change in resistance/strain) from -5 to -20. This compares with conventional strain gauges where the gauge factor is normally +2. These sensors cycle to strains of over 10%. We have measured gauge factors as a function of the orientation of the sensing line to the fabric axes, to the strain axes for different fabric structures. We can correlate the gauge factor with the extent to which the twisted multifilament yarns are expected to become laterally compressed. In preliminary tests we have shown that these printed sensors can be used to monitor knee and wrist motions and so could be used to provide information in applications such as rehabilitation from joint damage.

Paper Details

Date Published: 5 April 2007
PDF: 8 pages
Proc. SPIE 6524, Electroactive Polymer Actuators and Devices (EAPAD) 2007, 65241I (5 April 2007); doi: 10.1117/12.715740
Show Author Affiliations
Paul Calvert, Univ. of Massachusetts/Dartmouth (United States)
Prabir Patra, Univ. of Massachusetts/Dartmouth (United States)
Te-Chen Lo, Univ. of Massachusetts/Dartmouth (United States)
Chi H. Chen, Univ. of Massachusetts/Dartmouth (United States)
Amit Sawhney, Univ. of Massachusetts/Dartmouth (United States)
Animesh Agrawal, Univ. of Massachusetts/Dartmouth (United States)

Published in SPIE Proceedings Vol. 6524:
Electroactive Polymer Actuators and Devices (EAPAD) 2007
Yoseph Bar-Cohen, Editor(s)

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