The Experts below are selected from a list of 612 Experts worldwide ranked by ideXlab platform
Ozgur Atalay - One of the best experts on this subject based on the ideXlab platform.
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knitted strain sensors impact of design parameters on sensing properties
Sensors, 2014Co-Authors: Ozgur Atalay, William Richard KennonAbstract:This paper presents a study of the sensing properties exhibited by textile-based knitted strain sensors. Knitted sensors were manufactured using flat-bed Knitting Technology, and electro-mechanical tests were subsequently performed on the specimens using a tensile testing machine to apply strain whilst the sensor was incorporated into a Wheatstone bridge arrangement to allow electrical monitoring. The sensing fabrics were manufactured from silver-plated nylon and elastomeric yarns. The component yarns offered similar diameters, bending characteristics and surface friction, but their production parameters differed in respect of the required yarn input tension, the number of conductive courses in the sensing structure and the elastomeric yarn extension characteristics. Experimental results showed that these manufacturing controls significantly affected the sensing properties of the knitted structures such that the gauge factor values, the working range and the linearity of the sensors varied according to the knitted structure. These results confirm that production parameters play a fundamental role in determining the physical behavior and the sensing properties of knitted sensors. It is thus possible to manipulate the sensing properties of knitted sensors and the sensor response may be engineered by varying the production parameters applied to specific designs.
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Textile-based weft knitted strain sensors: Effect of fabric parameters on sensor properties
Sensors (Switzerland), 2013Co-Authors: Ozgur Atalay, William Richard Kennon, Muhammad Dawood HusainAbstract:The design and development of textile-based strain sensors has been a focus of research and many investigators have studied this subject. This paper presents a new textile-based strain sensor design and shows the effect of base fabric parameters on its sensing properties. Sensing fabric could be used to measure articulations of the human body in the real environment. The strain sensing fabric was produced by using electronic flat-bed Knitting Technology; the base fabric was produced with elastomeric yarns in an interlock arrangement and a conductive yarn was embedded in this substrate to create a series of single loop structures. Experimental results show that there is a strong relationship between base fabric parameters and sensor properties.
Tilak Dias - One of the best experts on this subject based on the ideXlab platform.
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Knitting of electroconductive yarns
IEE Eurowearable '03, 2020Co-Authors: Jess Power, Tilak DiasAbstract:The advantages of producing 3-D conductive knitted textiles for the purpose of generating heat are enormous. Products may be developed that conform to complex contours providing a uniform heat distribution. Applications can be foreseen in the automotive sector; car seats, driving wheels and the interiors of door panel. Medical usage could involve conforming the knitted structure to the body, providing relief to sports injuries. In fact the development of 3-D knitted heating elements, could apply heat uniformly to any requirement whether technical, medical of merely a fashion aid. The area of electro-conductive textiles is currently under investigation, partly due to the amount of development that has been undertaken in fibres and yarns. Many textile products including garments are being developed for the purpose of generating heat or for use as electrical conductors. Past investigations in this area have given preference to weaving, due to the lack of awareness of the capabilities of the latest developments in electronic flat-bed Knitting Technology. The modern electronic flat-bed Knitting machine is capable of producing a variety of structures, which contribute significantly to the fabrics' mechanics and often denote their final application. Recent developments in CAD/CAM and the integration of mechatronic concepts with flat-bed Knitting machines have made it commercially possible to produce complex mixtures of shapes and structures utilising a variety of methods. The prospect of 3-D shaping a conductive textile structure on the flat-bed Knitting machine, offers vast potential for both technical and apparel applications. In order to enable 3-D shaped shells to be produced accurately for usage in electroconductive textiles, it is essential to have a full understanding of the geometrical properties of the knitted structure; and the effects that the various shaping techniques enforce
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Knitted electromagnetic textile surfaces
2013Co-Authors: Alan Tennant, W. Hurley, Tilak DiasAbstract:We report a commercially attractive approach to manufacturing conducting textiles which is based on computerised flat-bed Knitting Technology using conducting yarns. We examine how flat-bed Knitting can be used to manufacture large area samples of functional electromagnetic structures such as frequency selective surfaces (FSS). In addition we show how the Knitting process can be adapted to allow the integration of conducting vias into a 3-D knitted spacer structure to form an electromagnetic high impedance surface (HIS).
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Development of Electrically Active Textiles
Advances in Science and Technology, 2008Co-Authors: Tilak Dias, Ravi Monaragala, William Hurley, R. WijeyesiriwardanaAbstract:The current generation of textiles, including technical textiles are passive. However the next generation of textiles will have the ability to monitor its environment and interact accordingly in order to accomplish a pre-programmed functionality. Such textiles can be considered as truly smart textiles, and they would consist of three basic components: 1. sensing and measuring capability; 2. activation capability; 3. intelligence (programming capability). One of the solutions for incorporating the above components into a textile structure is to create electrically active zones within the structure, whose electrical characteristics can change due to an environmental change or whose structural properties would change due to application of an electrical signal, for example change of dimensions due to the flow of an electrical current in the electrically active area. Generally textiles are made out of materials of very high electrical resistance and can, therefore, be considered as materials with good electrical insulating properties. The aim of the paper is to demonstrate the development of electrically active knitted structures and switches which have resulted from the research carried out by my research group in the School of Materials of the University of Manchester, UK. Around eight years ago a multidisciplinary research group was set-up by me in order to develop electrically active textiles (EAT®); the skills set of the group comprised of Knitting Technology, electronics and software engineering and textile fibres. Knitted structures exhibit following characteristics: • good tensile recovery properties; • superior drapability, which would provide excellent skin contact; • breathability: the structures are air permeable, giving more comfort. In view of the above we decided to utilise the latest Knitting Technology to develop EAT structures. Knitting Technology provides several different production routes; circular and flat-bed weft Knitting and warp Knitting. One Technology in particular, the modern computerised flat-bed Knitting Technology, has made quantum leaps during the last few decades thanks to the extensive use of mechatronic systems for all mechanical movements and CAD/CAM systems. The most important features of the Technology are: the precision positioning of fibres in 3D space; which is very useful in EAT construction, i.e. the placement of different fibres at appropriate positions in a knitted structure; • the freedom to construct structures with different binding elements; which is useful for the optimisation of EAT for maximum sensitivity and performance; • 3D structures add an additional dimension to the EAT construction; • multilayer structures are very useful for constructing EAT with integrated power and data lines; • true seamless garment Knitting. It is our belief that the best platform for the development of multilayered 3D EAT structures is provided by the above Technology. Different layers can be used for creating arrays of sensors and conductive pathways for power and data lines. Such EAT structures would be washable, and the Technology would enable them to be manufactured with a higher degree of precision at low cost (due to minimum labour involvement).
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Fibre-meshed transducers based real time wearable physiological information monitoring system
Eighth International Symposium on Wearable Computers, 2004Co-Authors: Ravindra Wijesiriwardana, K. Mitcham, Tilak DiasAbstract:Unobtrusive sensors are an important element in wearable systems. One approach in constructing unobtrusive transducers is to use smart materials and then integrate them into smart unobtrusive fabric structures. These types of transducers are called fabric transducers (Fibre-Meshed Transducers or FMTs). Fabrication is carried out via textiles manufacturing processes. In this paper we have discussed three types of FMTs and their applications. Also the discussion is further extended towards real time physiological monitoring system. We have constructed resistive, inductive and capacitive transducers with electronic flatbed Knitting Technology. The resistive FMTs that were developed inherited with limitations. The inductive FMTs are used for motion and gesture capturing of the kinematical joints of the human body, and capacitive FMTs are used as bio-potential electrodes, which were used to measure ECG. Also we have used the capacitive FMTs as switches. Further we have developed a PDA based wearable physiological monitoring system by using these novel FMTs.
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Conference proceedings of the Institute of Electrical Engineers Eurowearables 2003. Birmingham, UK
2003Co-Authors: Jess Power, Tilak DiasAbstract:The advantages of producing 3-D conductive knitted textiles for the purpose of generating heat are enormous. Products may be developed that conform to complex contours providing a uniform heat distribution. Applications can be foreseen in the automotive sector; car seats, driving wheels and the interiors of door panel. Medical usage could involve conforming the knitted structure to the body, providing relief to sports injuries. In fact the development of 3-D knitted heating elements, could apply heat uniformly to any requirement whether technical, medical of merely a fashion aid. The area of electro-conductive textiles is currently under investigation, partly due to the amount of development that has been undertaken in fibres and yarns. Many textile products including garments are being developed for the purpose of generating heat or for use as electrical conductors. Past investigations in this area have given preference to weaving, due to the lack of awareness of the capabilities of the latest developments in electronic flat-bed Knitting Technology. The modern electronic flat-bed Knitting machine is capable of producing a variety of structures, which contribute significantly to the fabrics' mechanics and often denote their final application. Recent developments in CAD/CAM and the integration of mechatronic concepts with flat-bed Knitting machines have made it commercially possible to produce complex mixtures of shapes and structures utilising a variety of methods. The prospect of 3-D shaping a conductive textile structure on the flat-bed Knitting machine, offers vast potential for both technical and apparel applications. In order to enable 3-D shaped shells to be produced accurately for usage in electroconductive textiles, it is essential to have a full understanding of the geometrical properties of the knitted structure; and the effects that the various shaping techniques enforce.
Muhammad Dawood Husain - One of the best experts on this subject based on the ideXlab platform.
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Textile-based weft knitted strain sensors: Effect of fabric parameters on sensor properties
Sensors (Switzerland), 2013Co-Authors: Ozgur Atalay, William Richard Kennon, Muhammad Dawood HusainAbstract:The design and development of textile-based strain sensors has been a focus of research and many investigators have studied this subject. This paper presents a new textile-based strain sensor design and shows the effect of base fabric parameters on its sensing properties. Sensing fabric could be used to measure articulations of the human body in the real environment. The strain sensing fabric was produced by using electronic flat-bed Knitting Technology; the base fabric was produced with elastomeric yarns in an interlock arrangement and a conductive yarn was embedded in this substrate to create a series of single loop structures. Experimental results show that there is a strong relationship between base fabric parameters and sensor properties.
William Richard Kennon - One of the best experts on this subject based on the ideXlab platform.
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knitted strain sensors impact of design parameters on sensing properties
Sensors, 2014Co-Authors: Ozgur Atalay, William Richard KennonAbstract:This paper presents a study of the sensing properties exhibited by textile-based knitted strain sensors. Knitted sensors were manufactured using flat-bed Knitting Technology, and electro-mechanical tests were subsequently performed on the specimens using a tensile testing machine to apply strain whilst the sensor was incorporated into a Wheatstone bridge arrangement to allow electrical monitoring. The sensing fabrics were manufactured from silver-plated nylon and elastomeric yarns. The component yarns offered similar diameters, bending characteristics and surface friction, but their production parameters differed in respect of the required yarn input tension, the number of conductive courses in the sensing structure and the elastomeric yarn extension characteristics. Experimental results showed that these manufacturing controls significantly affected the sensing properties of the knitted structures such that the gauge factor values, the working range and the linearity of the sensors varied according to the knitted structure. These results confirm that production parameters play a fundamental role in determining the physical behavior and the sensing properties of knitted sensors. It is thus possible to manipulate the sensing properties of knitted sensors and the sensor response may be engineered by varying the production parameters applied to specific designs.
Ravindra Wijesiriwardana - One of the best experts on this subject based on the ideXlab platform.
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Inductive fiber-meshed strain and displacement transducers for respiratory measuring systems and motion capturing systems
2006Co-Authors: Ravindra WijesiriwardanaAbstract:Unobtrusive transducers play an important part in wearable and mobile computing fields. One out of many methods of implementations is to use smart materials and integrate them into intelligent structures via the route of fabric manufacturing processes that are capable of transducer action. This new breed of transducers is called fabric transducers. However, fabric transducers that were developed mainly focused on the variations in the resistance and capacitance of the electroconductive fabric structures. Therefore, they inhibit the disadvantages that are common in resistive and capacitive transducers. Moreover, they have limitations in operating as strain or displacement transducers. To overcome the limitations, research has been carried out to investigate constructions of an inductive fiber meshed strain and of displacement transducer. Electroconductive fibers (polymeric and metallic) of different conductivity levels were arranged in helical paths to form coils. The fibers were arranged by using flat bed-Knitting Technology. This paper discusses the constructions, simulations, performances, and limitations of the inductive fiber meshed transducers. Also, the discussion is further extended toward two specific applications: respiratory measuring systems and motion capturing systems
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Capacitive fiber-meshed transducers for touch and proximity-sensing applications
IEEE Sensors Journal, 2005Co-Authors: Ravindra Wijesiriwardana, K. Mitcham, W. Hurley, T. DiasAbstract:Capacitive sensing is used in manufacturing E-textiles for touch and proximity-sensing applications. The common approach is to construct electrodes on top of a nonconductive fabric structures. Woven and knitted fabric structures are used for the construction; metallic wire and conductive coated fibers are primarily used. Due to the performance degradation and poor comfort of these constructions, we have constructed electrodes with inherently conductive polymers and multifilament metallic fibers by integrating them into fiber-meshed structures such that the electrodes are a part of the nonconductive base structure. We have used capacitive and resistive measurement techniques for the detection. Out of many mechanical methods of fiber-integrating processors, we have used flat bed-Knitting Technology and Jacquard weaving Technology. In this paper, we have discussed the construction, sensing, and applications of capacitive fiber-meshed transducers and their applications.
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Fibre-meshed transducers based real time wearable physiological information monitoring system
Eighth International Symposium on Wearable Computers, 2004Co-Authors: Ravindra Wijesiriwardana, K. Mitcham, Tilak DiasAbstract:Unobtrusive sensors are an important element in wearable systems. One approach in constructing unobtrusive transducers is to use smart materials and then integrate them into smart unobtrusive fabric structures. These types of transducers are called fabric transducers (Fibre-Meshed Transducers or FMTs). Fabrication is carried out via textiles manufacturing processes. In this paper we have discussed three types of FMTs and their applications. Also the discussion is further extended towards real time physiological monitoring system. We have constructed resistive, inductive and capacitive transducers with electronic flatbed Knitting Technology. The resistive FMTs that were developed inherited with limitations. The inductive FMTs are used for motion and gesture capturing of the kinematical joints of the human body, and capacitive FMTs are used as bio-potential electrodes, which were used to measure ECG. Also we have used the capacitive FMTs as switches. Further we have developed a PDA based wearable physiological monitoring system by using these novel FMTs.