2023-03-24 スイス連邦工科大学チューリッヒ校(ETHZurich)
このセンサーは、繊維に直接統合され、着用者が疲労限界に達するときに休憩を取ることができるようにする。ETH Zurichは、特許を申請しており、これによって市場で使用可能なコスト効果の高いスマートウェアの製造が可能になる。
センサーは、特別なタイプの糸で作られており、通常よりも敏感で微小な動きでも感知できるようになっている。また、アンテナを含む完全に一体化された電気回路を形成し、繊維に直接縫い付けられ、スマートフォンに電気信号をワイヤレスで送信することもできる。スマートウェアは、スポーツだけでなく職場でも使用され、労働者の疲労に関する問題を解決する可能性がある。
＜関連情報＞
- https://ethz.ch/en/news-and-events/eth-news/news/2023/03/detecting-exhaustion-with-smart-sportswear.html
- https://onlinelibrary.wiley.com/doi/10.1002/adma.202209321
HACS：理論限界を超える感度を持つヘリカルオーセティックヤーン静電容量式歪みセンサー HACS: Helical Auxetic Yarn Capacitive Strain Sensors with Sensitivity Beyond the Theoretical Limit
Tyler J. Cuthbert, Brett C. Hannigan, Pierre Roberjot, Alexander V. Shokurov, Carlo Menon
Advanced Materials Published: 12 December 2022
DOI:https://doi.org/10.1002/adma.202209321
Abstract
The development of flexible strain sensors over the past decade has focused on accessing high strain percentages and high sensitivity (i.e., gauge factors). Strain sensors that employ capacitance as the electrical signal to correlate to strain are typically restricted in sensitivity because of the Poisson effect. By employing auxetic structures, the limits of sensitivity for capacitive sensors have been exceeded, which has improved the competitiveness of this modality of sensing. In this work, the first employment of helical auxetic yarns as capacitive sensors is presented. It is found that the response of the helical auxetic yarn capacitive sensors (termed as HACS) is dependent on the two main fabrication variables—the ratio of diameters and the helical wrapping length. Depending on these variables, sensors that respond to strain with increasing or decreasing capacitance values can be obtained. A greater auxetic character results in larger sensitivities accessible at smaller strains—a characteristic that is not commonly found when accessing high gauge factors. In addition, the highest sensitivity for auxetic capacitive sensors reported thus far is obtained. A mechanism of sensor response that explains both the variable capacitance response and the high gauge factors obtained experimentally is proposed.
