Advances made in technology of electronic sensors, have resulted in the development and utilization of flexible sensors in personal electronics, artificial intelligence, and industrial production. The use of wearable textile pressure sensors has become widespread due to desire for flexibility, ease of use, lightness, comfort and their ability to fit to 3D objects. In this study, Piezoresistive sensors were designed based on spinning of core-wrap yarns. Conductive yarns with various conductivities were used in the production of the developed sensors. The designed sensor have merits such as ease of fabrication, no use of chemical or complex tools, low cost of production and the high rate of production. The electromechanical behavior of the core-wrapped Piezoresistive yarns in terms of their electrical resistance variation under exertion of various mechanical stresses such as pressure, tension, torsion, bending together with various atmospheric environmental conditions and eventually 5 laundering cycles was eva‎luated. Results vividly demonstrated the inability of the exerted stresses in affecting the electrical resistance of the core-wrapped Piezoresistive yarns. The sensor samples were prepared by two orthogonally placed Piezoresistive yarns. These textile-based assembled pressure sensors benefitted from advantages such as high sensitivity. The sensitivity of the flexible sensor was found to be 3.29 kpa-1 and wide range of pressure from 1 to 750 kilopascals. The high-pressure range and the associated variable sensitivities of the core-wrapped yarns enables the sensor to be used in a wide range of applications. The study also substantiated the linear response of these sensors. In order to eva‎luate the spatial pressure distribution, mapping operation was carried out, using 4x4 matrices composed of the Piezoresistive yarns. It was found that for 1 and 4 cm2 resolutions, the obtained data are very acceptable and valid. The developed matrices were incorporated in woven fabrics. The fabric construction were plain and sateen using pick densities. It was found that behavior of the test fabric sensor is both dependent on the fabric pattern and pick density. Finally, it was concluded that the use of Sateen weave and high pick density results in production of highly reliable sensor with satisfactory output signal .

محمد ذره بيني اصفهاني , محسن شنبه

عبدالكريم حسيني , وحيد عبادي