Knitted RESi: A Highly Flexible, Force-Sensitive Knitted Textile Based on Resistive Yarns

Pointner, Andreas; Preindl, Thomas; Mlakar, Sara; Aigner, Roland; Haller, Michael

doi:10.1145/3388534.3407292

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…Rather than attaching functional objects to a soft structure, the soft structure itself might become functional. This might be achieved by the use of functional dyes [21], or by weaving or knitting fabric or clothing consisting of multi-material yarns [22,60]. Such multi-material fabrication enables creating devices with integrated sensors [48,52] as well as detailed characterization of interaction between textile design and sensor performance [84,85].…”

Section: Knit Structures and Soft Wearablesmentioning

confidence: 99%

Singing Knit: Soft Knit Biosensing for Augmenting Vocal Performances

Reed

Skach

Strohmeier

et al. 2022

Augmented Humans 2022

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Section: Knit Structures and Soft Wearablesmentioning

confidence: 99%

Singing Knit: Soft Knit Biosensing for Augmenting Vocal Performances

Reed

Skach

Strohmeier

et al. 2022

Augmented Humans 2022

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“…Force sensors has been an active area of research over the past years in the flexible electronics and MEMS sensor communities [28,[65][66][67][68][69][70][71][72][73]]. Today's force sensors can be roughly divided into three groups, impedance based sensors, piezo sensors and magnetic sensors [23, 25-27, 29, 53, 74-77].…”

Section: Discrete Mems Force Sensorsmentioning

confidence: 99%

WiForceSticker: Batteryless, Thin Sticker-like Flexible Force Sensor

Gupta¹,

Park²,

Bashar³

et al. 2022

Preprint

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Any two objects in contact with each other exert a force that could be simply due to gravity or mechanical contact, such as a robotic arm gripping an object or even the contact between two bones at our knee joints. The ability to naturally measure and monitor these contact forces allows a plethora of applications from warehouse management (detect faulty packages based on weights) to robotics (making a robotic arms' grip as sensitive as human skin) and healthcare (knee-implants). It is challenging to design a ubiquitous force sensor that can be used naturally for all these applications. First, the sensor should be small enough to fit in narrow joints or not make the robotic arm bulky. Next, we don't want to lay long, cumbersome cables to read the force values from the sensor to the monitoring device. And finally, even current wireless technology requires a battery that could be hazardous for in-body applications. We develop WiForceSticker, a wireless, battery-free, sticker-like force sensor that can be ubiquitously deployed on any surface, such as all warehouse packages, robotic arms, and knee joints. WiForceSticker first designs a tiny 4 mm × 2 mm × 0.4 mm capacitative sensor design equipped with a 10 mm × 10 mm antenna designed on a flexible PCB substrate. Secondly, it introduces a new mechanism to transduce the force information on ambient RF radiations that can be read by a remotely located reader wirelessly without requiring any battery or active components at the force sensor, by interfacing the sensors with COTS RFID systems. The sensor can detect forces in the range of 0-6 N with sensing accuracy of < 0.5 N across multiple testing environments and evaluated with over 10, 000 varying force level presses on the sensor. We also showcase two application case studies with our designed sensors, weighing warehouse packages and sensing forces applied by bone joints.

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“…Recently, textile materials, including yarns and fibers, are considered promising substrates in wearable electronic products. ,, Textile-based electronics (e-textiles) are defined as smart textiles or smart fabrics that perceive and respond to the surrounding environment in a predictable manner. , Textile-based sensors have the advantages of being noninvasive, offering a high level of comfort, low in cost and light in weight, having good flexibility, and being suitable for all kinds of body shapes, which make them effective substitutes for traditional solid-state sensors . Textile-based ultrasoft, wear-resistant, and easily integrated pressure/stress sensors that can be mass manufactured, have breathability, high sensitivity, and stable output performances, as well as a fast response, have also been widely applied in wearable health monitoring and motion detection devices .…”

Section: Introductionmentioning

confidence: 99%

Three-Directional Spacer-Knitted Piezoresistant Strain and Pressure Sensor for Electronic Integration and On-Body Applications

Jiang,

Hu,

Jin

et al. 2023

ACS Appl. Mater. Interfaces

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The advancement of smart textiles has resulted in significant development in wearable textile sensors and offers novel interfaces to sense physical movements in daily life. Knitting, as a traditional textile fabrication method, is being used in promising ways to realize fully seamless fabrication and unobtrusive sensing in wearable textile applications. However, current flat-knitted sensors can sense strain only in the horizontal plane. This research presents a novel fully machine-knitted spacer piezoresistive sensor structure with a three-directional sensing ability that can detect both the pressure in the vertical direction and the strain in the warp/weft direction. Besides, it can sense the pressure under 1 kPa, which is critical in comfortable on-body interaction, one-piece integration, and wearable applications. Three sizes spacer-knitted sensors are evaluated in terms of their mechanical performance, stability cycles, and reaction to external factors such as sweat, laundering, etc. Then, the effect of material choice on sensor performance is evaluated and the rationale behind the use of different materials is summarized. Specifically, this research presents a detailed evaluation of the applications with both a single sensor and multiple sensor arrays for fine and gross motion sensing in several scenarios. The testing results demonstrate a fully machine-knitted piezoresistive sensor that can detect multidirectional motions (vertical, warp, and weft directions). In addition, this knitted sensor is scalable and can be facilely and seamlessly integrated into any garment piece. This universal knitted sensor structure could be made with a wide variety of materials for high sensitivity for multidirectional strain/pressure sensing, making it a high-compatibility sensor structure for wearable applications.

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Knitted RESi: A Highly Flexible, Force-Sensitive Knitted Textile Based on Resistive Yarns

Cited by 15 publications

References 3 publications

Singing Knit: Soft Knit Biosensing for Augmenting Vocal Performances

Singing Knit: Soft Knit Biosensing for Augmenting Vocal Performances

WiForceSticker: Batteryless, Thin Sticker-like Flexible Force Sensor

Three-Directional Spacer-Knitted Piezoresistant Strain and Pressure Sensor for Electronic Integration and On-Body Applications

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