Development of textile-based resistive pressure sensing structures for wearable electronic systems

The aim of this research work is to develop textile-based resistive soft pressure sensing structures. In order to achieve this aim, two conductive knit fabrics are separated by non-conductive mesh fabric. Working mechanism of the sensors rely on gradual contact of the conductive fabrics through the mesh fabric thereby changing the electrical resistivity of the structure. Proposed sensors are compliant, flexible and easy to produce. The initial electrical resistance of the soft resistive sensors was measured before any applied load. It was observed that sensors were non-conductive. This indicates that sensing structures could also be utilized as flexible pressure switches. Effect of mesh size on sensitivities and working range of the sensors are also investigated. It was found that while bigger mesh size contributes the higher sensitivity, it reduces the working range of the sensor. However, this property can be utilized to adjust sensitivity and working range of the sensor for targeted applications.