The influence of the textile substrate on the performance of a textile-based strain sensor has not been well understood or characterized in many wearable sensor evaluations. The underlying textile has its own anisotropic mechanical behaviors due to its woven or knit fabrication process, and introduces non-trivial structural influences on integrated wearable strain sensors. This study considers stitched strain sensors of two stitch geometries, fabricated on two different knit fabrics, with the sensor stitched in different orientations with respect to the knit structure. The resulting mechanical and electrical performance is characterized under cyclic extension, as the angle of extension (relative to the fabric) is also incrementally changed. The results illustrate a shift from linear to non-linear mechanical behavior as fabric stiffness increases, and variations in behavior between stitch geometries. Results show that force direction and sensor placement both introduce variability in calculated elastic modulus, which affect sensor modeling (e.g. predicting applied force from sensor response). A novel stitch geometry (the chainstitch sensor) is characterized as having a higher gauge force and lower transverse sensitivity factor than the coverstitch sensor. This work offers insight into the textile-sensor interface and design implications for development of textile-based sensors.
|Original language||English (US)|
|Title of host publication||ISWC 2019 - Proceedings of the 2019 ACM International Symposium on Wearable Computers|
|Publisher||Association for Computing Machinery|
|Number of pages||9|
|State||Published - Sep 9 2019|
|Event||23rd International Symposium on Wearable Computers, ISWC 2019 - London, United Kingdom|
Duration: Sep 9 2019 → Sep 13 2019
|Name||Proceedings - International Symposium on Wearable Computers, ISWC|
|Conference||23rd International Symposium on Wearable Computers, ISWC 2019|
|Period||9/9/19 → 9/13/19|
Bibliographical noteFunding Information:
This work was supported in part by the US National Science Foundation under grant #1722738.
© 2019 Association for Computing Machinery.
- Smart clothing
- Strain sensor
- Wearable sensor
- Wearable technology