Comparative study of the weft-knitted strain sensors

In this study, weft-knitted strain-sensing structures are described, along with the materials and manufacturing techniques required to produce the fabrics on a computerised flat-bed knitting machine. Knitted sensing fabrics with conductive yarns, i.e. silver-plated nylon yarn and polyester-blended stainless steel yarn have been created with different design possibilities. A laboratory test set-up was built to characterise the knitted sensors and the resulting equivalent resistance under the different level of strains. The most successful samples have been realised through a series of single conductive courses within the interlock base fabric structure using silver-plated nylon in terms of responsivity, repeatability and lower electrical signal drift. Deficiencies associated with strain-sensing structures realised through the intermeshing of conductive yarns have also been addressed.

[1]  M. Senthilkumar,et al.  Elastane fabrics – A tool for stretch applications in sports , 2011 .

[2]  Xiaoming Tao,et al.  Electrical textile sensors for repeated large deformation: structures and electromechanical properties , 2008, International Conference on Experimental Mechanics.

[3]  Ding Yong-sheng.  Design and Analysis of Woven Structure-Based Flexible Strain Sensor , 2008 .

[4]  Bridget J. Munro,et al.  The intelligent knee sleeve: a wearable biofeedback device , 2008 .

[5]  J.G. da Silva,et al.  High sensitivity low cost capacitive strain gage , 2004, Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.04CH37510).

[6]  R. Zhang,et al.  Study of the Structural Design and Capacitance Characteristics of Fabric Sensor , 2011 .

[7]  Ching-Tang Huang,et al.  Parametric design of yarn-based piezoresistive sensors for smart textiles , 2008 .

[8]  S. Mukhopadhyay,et al.  Resistive fibre-meshed transducers , 2003, Seventh IEEE International Symposium on Wearable Computers, 2003. Proceedings..

[9]  Lucy E. Dunne,et al.  Overlock-Stitched Stretch Sensors: Characterization and Effect of Fabric Property , 2013 .

[10]  W. Schomburg,et al.  The design of metal strain gauges on diaphragms , 2004 .

[11]  Michal Frydrysiak,et al.  Textronic clothing with resistance textile sensor to monitoring frequency of human breathing , 2012, 2012 IEEE International Symposium on Medical Measurements and Applications Proceedings.

[12]  Holger Harms,et al.  Textile pressure sensors for sports applications , 2010, 2010 IEEE Sensors.

[13]  Dan Mihai Stefanescu,et al.  Strain gauges and Wheatstone bridges — Basic instrumentation and new applications for electrical measurement of non-electrical quantities , 2011, Eighth International Multi-Conference on Systems, Signals & Devices.

[14]  Xm M. Tao,et al.  Strain sensing behavior of electrically conductive fibers under large deformation , 2011 .

[15]  Tilak Dias,et al.  Design and fabrication of Temperature Sensing Fabric , 2014 .

[16]  Fuh-Gwo Yuan,et al.  Carbon nanotube yarn strain sensors , 2010, Nanotechnology.

[17]  Ozgur Atalay,et al.  Weft-Knitted Strain Sensor for Monitoring Respiratory Rate and Its Electro-Mechanical Modeling , 2015, IEEE Sensors Journal.

[18]  Matthew W. Chan,et al.  Localized strain sensing using high spatial resolution, highly-sensitive MEMS resonant strain gauges for failure prevention , 2011, 2011 16th International Solid-State Sensors, Actuators and Microsystems Conference.

[19]  Dezhi Zhou,et al.  Conducting polymers electromechanical actuators and strain sensors , 2003 .

[20]  Ozgur Atalay,et al.  Textile-Based Weft Knitted Strain Sensors: Effect of Fabric Parameters on Sensor Properties , 2013, Sensors.

[21]  Ozgur Atalay,et al.  Knitted Strain Sensors: Impact of Design Parameters on Sensing Properties , 2014, Sensors.

[22]  M. Skrifvars,et al.  Stretch sensing properties of conductive knitted structures of PEDOT-coated viscose and polyester yarns , 2014 .

[23]  Gerhard Tröster,et al.  Combining electronics on flexible plastic strips with textiles , 2013 .

[24]  Gordon G. Wallace,et al.  Polypyrrole coated nylon lycra fabric as stretchable electrode for supercapacitor applications , 2012 .

[25]  Dezhi Zhou,et al.  Conducting polymer coated lycra , 2005 .