基于导电纤维针织物的柔性传感器研究

Research on Flexible Sensors Based on Knitted Fabric with Conductive Fiber

本文以4种镀银纱纬编针织物为试样,测试了其单向拉伸时的导电性能,考察了拉伸性能对其电阻的影响。研究结果表明,在小应变的情况下,电阻与其应变成线性关系;竖条纹双罗纹针织物的灵敏度最大,横条纹双罗纹针织物的次之,镀银纱纬平针织物的最小;纱线间接触电阻的变化是引起纬平针织物电阻变化的最关键因素;将双罗纹织物重复拉伸来模拟心跳信号,结果显示电阻能基本稳定在一个值上,可以满足传感器稳定性的要求。

Four kinds of weft knitted fabrics made of silver-plating yarn were taken as samples and their conductivities were tested under weft tensile to investigate the relationships between tensile property and resistance. The results are the following: the resistance of fabric has a linear relationship with strain within a definite range; as for strain sensitivity, vertical stripe interlock with silver-plating and wool yarn, horizontal stripe interlock fabric with silver-plating and wool yarn fabric is the most remarkable one, plain fabrics with silver-plating and spandex comes second, and plain fabric with silver-plating yarn is the least; the change of contact resistance among yarns during stretching caused different fabric sensitive to strain; when the interlock fabrics were stretched repeatedly to simulate the heartbeat signals, their resistances remained stable at a value, so they can satisfy the stability requirement.