ENSAIT (Ecole Nationale Supérieure des Arts et Industries Textiles), Institute Centrale Lille, GEMTEX, Laboratoire de Génie et Matériaux Textiles, 2 Allée Louise et Victor Champier, 59056 Roubaix CEDEX 1, F-59000 Lille, France.
Sensors (Basel). 2020 Nov 20;20(22):6641. doi: 10.3390/s20226641.
By incorporating electrically conductive yarns into a waterproof membrane, one can detect epoxy resin cracking or liquid leakage. Therefore, this study examined the electrical conductivity variations of several yarns (metallic or carbon-based) for cracking and water detection. The first observations concerned the detectors' feasibility by investigating their conductivity variations during both their resin implementation processes and their resin cracking. Throughout this experiment, two phenomena were detected: the compression and the separation of the fibres by the resin. In addition, the resin cracking had an important role in decreasing the yarns' conductivity. The second part of this study concerned water detection. Two principles were established and implemented, first with yarns and then with yarns incorporated into the resin. First, the principle of absorption was based on the conductivity variation with the yarns' swelling after contact with water. A short circuit was established by the creation of a conductive path when a drop of water was deposited between two conductive, parallel yarns. Through the influence of the yarns' properties, this study explored the metallic yarns' capacity to better detect water with a short circuit and the ability of the carbon-based yarns to detect water by the principle of absorption.
通过将导电纱线融入防水膜中，可以检测到环氧树脂的裂缝或液体泄漏。因此，本研究考察了几种纱线（金属或基于碳的）的导电性变化，以检测裂缝和水。首先，通过研究纱线在树脂实施过程中和树脂裂缝过程中的电导率变化，考察了探测器的可行性。在整个实验过程中，检测到了两个现象：树脂对纤维的压缩和分离。此外，树脂裂缝对降低纱线的导电性有重要作用。本研究的第二部分涉及水的检测。建立并实施了两个原理，首先是使用纱线，然后是将纱线纳入树脂中。首先，吸收原理基于纱线接触水后膨胀导致的电导率变化。当两束导电平行纱线之间滴一滴水时，会形成一个短路，从而建立一个导电通路。通过纱线性能的影响，本研究探索了金属纱线在短路上更好地检测水的能力，以及碳基纱线通过吸收原理检测水的能力。
