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NC State Research: Machine Learning to Create a Fabric-Based Touch Sensor (c) NC State University
13.05.2024

Machine Learning to Create a Fabric-Based Touch Sensor

A new study from NC State University combines three-dimensional embroidery techniques with machine learning to create a fabric-based sensor that can control electronic devices through touch.

As the field of wearable electronics gains more interest and new functions are added to clothing, an embroidery-based sensor or “button” capable of controlling those functions becomes increasingly important. Integrated into the fabric of a piece of clothing, the sensor can activate and control electronic devices like mobile apps entirely by touch.  

A new study from NC State University combines three-dimensional embroidery techniques with machine learning to create a fabric-based sensor that can control electronic devices through touch.

As the field of wearable electronics gains more interest and new functions are added to clothing, an embroidery-based sensor or “button” capable of controlling those functions becomes increasingly important. Integrated into the fabric of a piece of clothing, the sensor can activate and control electronic devices like mobile apps entirely by touch.  

The device is made up of two parts; the embroidered pressure sensor itself and a microchip which processes and distributes the data collected by that sensor. The sensor is triboelectric, which means that it powers itself using the electric charge generated from the friction between its multiple layers. It is made from yarns consisting of two triboelectric materials, one with a positive electric charge and the other with a negative charge, which were integrated into conventional textile fabrics using embroidery machines.

Rong Yin, corresponding author of the study, said that the three-dimensional structure of the sensor was important to get right.

“Because the pressure sensor is triboelectric, it needed to have two layers with a gap in between them. That gap was one of the difficult parts in the process, because we are using embroidery which is usually two-dimensional. It’s a technique for decorating fabric,” he said. “It’s challenging to make a three-dimensional structure that way. By using a spacer, we were able to control the gap between the two layers which lets us control the sensor’s output.”

Data from the pressure sensor is then sent to the microchip, which is responsible for turning that raw input into specific instructions for any connected devices. Machine learning algorithms are key to making sure this runs smoothly, Yin said. The device needs to be able to tell the difference between gestures assigned to different functions, as well to disregard any unintentional inputs that might come from the cloth’s normal movement.

“Sometimes the data that the sensor acquires is not very accurate, and this can happen for all kinds of reasons,” Yin said. “Sometimes the data will be affected by environmental factors like temperature or humidity, or the sensor touches something by mistake. By using machine learning, we can train the device to recognize those kinds of things.

“Machine learning also allows this very small device to achieve many different tasks, because it can recognize different kinds of inputs.”

The researchers demonstrated this input recognition by developing a simple music playing mobile app which connected to the sensor via Bluetooth. They designed six functions for the app: play/pause, next song, last song, volume up, volume down and mute, each controlled by a different gesture on the sensor. Researchers were able to use the device for several other functions, including setting and inputting passwords and controlling video games.

The idea is still in its early stages, Yin said, as existing embroidery technology is not capable of easily handling the types of materials used in the creation of the sensor. Still, the new sensor represents another piece of the developing wearable electronics puzzle, which is sure to continue picking up interest in the near future.

The paper, “A clickable embroidered triboelectric sensor for smart fabric,” is published in Device.

Source:

North Carolina State University, Joey Pitchford

sportswear Stocksnap, Pixabay
30.08.2023

Detecting exhaustion with smart sportswear

Researchers at ETH Zurich have developed an electronic yarn capable of precisely measuring how a person’s body moves. Integrated directly into sportswear or work clothing, the textile sensor predicts the wearer’s exhaustion level during physical exertion.

Exhaustion makes us more prone to injury when we’re exercising or performing physical tasks. A group of ETH Zurich researchers led by Professor Carlo Menon, Head of the Biomedical and Mobile Health Technology Lab, have now developed a textile sensor that produces real-time measurements of how exhausted a person gets during physical exertion. To test their new sensor, they integrated it into a pair of athletic leggings. Simply by glancing at their smartphone, testers were able to see when they were reaching their limit and if they ought to take a break.

Researchers at ETH Zurich have developed an electronic yarn capable of precisely measuring how a person’s body moves. Integrated directly into sportswear or work clothing, the textile sensor predicts the wearer’s exhaustion level during physical exertion.

Exhaustion makes us more prone to injury when we’re exercising or performing physical tasks. A group of ETH Zurich researchers led by Professor Carlo Menon, Head of the Biomedical and Mobile Health Technology Lab, have now developed a textile sensor that produces real-time measurements of how exhausted a person gets during physical exertion. To test their new sensor, they integrated it into a pair of athletic leggings. Simply by glancing at their smartphone, testers were able to see when they were reaching their limit and if they ought to take a break.

This invention, for which ETH Zurich has filed a patent, could pave the way for a new generation of smart clothing: many of the products currently on the market have electronic components such as sensors, batteries or chips retrofitted to them. In addition to pushing up prices, this makes these articles difficult to manufacture and maintain.

By way of contrast, the ETH researchers’ stretchable sensor can be integrated directly into the material fibres of stretchy, close-fitting sportswear or work clothing. This makes large-scale production both easier and cheaper. Menon highlights another benefit: “Since the sensor is located so close to the body, we can capture body movements very precisely without the wearer even noticing.”

An extraordinary yarn
When people get tired, they move differently – and running is no exception: strides shorten and become less regular. Using their new sensor, which is made of a special type of yarn, the ETH researchers can measure this effect. It’s all thanks to the yarn’s structure: the inner fibre is made of a conductive, elastic rubber. The researchers wrapped a rigid wire, which is clad in a thin layer of plastic, into a spiral around this inner fibre. “These two fibres act as electrodes and create an electric field. Together, they form a capacitor that can hold an electric charge,” says Tyler Cuthbert, a postdoc in Menon’s group, who was instrumental in the research and development that led to the invention.

Smart running leggings
Stitching this yarn into the thigh section of a pair of stretchy running leggings means that it will stretch and slacken at a certain rhythm as the wearer runs. Each movement alters the gap between the two fibres, and thus also the electric field and the capacitor’s charge.

Under normal circumstances, these charge fluctuations would be much too small to help measure the body’s movements. However, the properties of this yarn are anything but normal: “Unlike most other materials, ours actually becomes thicker when stretched,” Cuthbert says. As a result, the yarn is considerably more sensitive to minimal movements. Stretching it even a little produces distinctly measurable fluctuations in the sensor’s charge. This makes it possible to measure and analyse even subtle changes in running form.

But how can this be used to determine a person’s exhaustion level? In previous research, Cuthbert and Menon observed a series of testers, who ran while wearing athletic leggings equipped with a similar sensor. They recorded how the electric signals changed as the runners got more and more tired. Their next step was to turn this pattern into a model capable of predicting runners’ exhaustion which can now be used for their novel textile sensor.  But ensuring that the model can make accurate predictions outside the lab will require a lot of additional tests and masses of gait pattern data.

Textile antenna for wireless data transfer  
To enable the textile sensor to send electrical signals wirelessly to a smartphone, the researchers equipped it with a loop antenna made of conducting yarn, which was also sewn directly onto the leggings. “Together, the sensor and antenna form an electrical circuit that is fully integrated into the item of clothing,” says Valeria Galli, a doctoral student in Menon’s group.

The electrical signal travels from the stretchable sensor to the antenna, which transmits it at a certain frequency capable of being read by a smartphone. The wearer runs and the sensor moves, creating a signal pattern with a continuously fluctuating frequency, which a smartphone app then records and evaluates in real time. But the researchers still have quite a bit of development work to do to make this happen.

Applications include sport and workplace
At the moment, the researchers are working on turning their prototype into a market-ready product. To this end, they are applying for one of ETH Zurich’s sought-after Pioneer Fellowships. “Our goal is to make the manufacture of smart clothing cost-effective and thus make it available to a broader public,” Menon says. He sees the potential applications stretching beyond sport to the workplace – to prevent exhaustion-related injuries – as well as to rehabilitation medicine.

Ultra-thin smart textiles are being refined for their use in obstetric monitoring and will enable analysis of vital data via app for pregnancies. Photo: Pixabay, Marjon Besteman
24.07.2023

Intelligent Patch for Remote Monitoring of Pregnancy

During pregnancy, regular medical check-ups provide information about the health and development of the pregnant person and the child. However, these examinations only provide snapshots of their state, which can be dangerous, especially in high-risk cases. To enable convenient and continuous monitoring during this sensitive phase, an international research consortium is planning to further develop the technology of smart textiles. A patch equipped with highly sensitive electronics is meant to collect and evaluate vital data. In addition, the sensors will be integrated into baby clothing in order to improve the future of medical monitoring for newborns with the highest level of data security.

During pregnancy, regular medical check-ups provide information about the health and development of the pregnant person and the child. However, these examinations only provide snapshots of their state, which can be dangerous, especially in high-risk cases. To enable convenient and continuous monitoring during this sensitive phase, an international research consortium is planning to further develop the technology of smart textiles. A patch equipped with highly sensitive electronics is meant to collect and evaluate vital data. In addition, the sensors will be integrated into baby clothing in order to improve the future of medical monitoring for newborns with the highest level of data security.

The beginning of a pregnancy is accompanied by a period of intensive health monitoring of the baby and the pregnant person. Conventional prenatal examinations with ultrasound devices, however, only capture snapshots of the respective condition and require frequent visits to doctors, especially in high-risk pregnancies. With the help of novel wearables and smart textiles, researchers in the EU-funded project Newlife aim to enable continuous obstetric monitoring in everyday life.

One goal of the consortium, consisting of 25 partners, is the development of a biocompatible, stretchable, and flexible patch to monitor the progress of the pregnancy and the embryo. Similar to a band-aid, the patch will be applied to the pregnant person’s skin, continuously recording vital data using miniaturized sensors (e.g., ultrasound) and transmitting it via Bluetooth.

For some time now, modern medical technology has been relying on smart textiles and intelligent wearables to offer patients convenient, continuous monitoring at home instead of stationary surveillance. At the Fraunhofer Institute for Reliability and Microelectronics IZM, a team led by Christine Kallmayer is bringing this technology to application-oriented implementation, benefitting from the Fraunhofer IZM’s years of experience with integrating technologies into flexible materials. For the integrated patch, the researchers are using thermoplastic polyurethane as base materials, in which electronics and sensors are embedded. This ensures that the wearing experience is similar to that of a regular band-aid instead of a rigid film.

To ensure that the obstetric monitoring is imperceptible and comfortable for both pregnant individuals and the unborn child, the project consortium plans to integrate innovative MEMS-based ultrasound sensors directly into the PU material. The miniaturized sensors are meant to record data through direct skin contact. Stretchable conductors made of TPU material tracks will then transmit the information to the electronic evaluation unit and finally to a wireless interface, allowing doctors and midwives to view all relevant data in an app. In addition to ultrasound, the researchers are planning to integrate additional sensors such as microphones, temperature sensors, and electrodes.

Even after birth, the new integration technology can be of great benefit to medical technology: With further demonstrators, the Newlife team plans to enable the monitoring of newborns. Sensors for continuous ECG, respiration monitoring, and infrared spectroscopy to observe brain activity will be integrated into the soft textile of a baby bodysuit and a cap. "Especially for premature infants and newborns with health risks, remote monitoring is a useful alternative to hospitalization and wired monitoring. For this purpose, we must guarantee an unprecedented level of comfort provided by the ultra-thin smart textiles: no electronics should be noticeable. Additionally, the entire module has to be extremely reliable, as the smart textiles should easily withstand washing cycles," explains Christine Kallmayer, project manager at Fraunhofer IZM.

For external monitoring of the baby's well-being, the project is also researching ways to use camera data and sensor technology in the baby's bed. Once the hardware basis of the patch, the textile electronics, and the sensor bed is built and tested, the project partners will take another step forward. Through cloud-based solutions, AI and machine learning will be used to simplify the implementation for medical staff and ensure the highest level of data security.

The Newlife project is coordinated by Philips Electronics Nederland B.V. and will run until the end of 2025. It is funded by the European Union under the Horizon Europe program as part of Key Digital Technologies Joint Undertaking under grant number 101095792 with a total of 18.7 million euros.

Source:

Fraunhofer Institute for Reliability and Microintegration IZM

Submarine sensors have lots to tell us about the situation below the surface. Fraunhofer IZM has mounted sensor systems on the two manta ray fins of the unmanned underwater vehicle designed by EvoLogics. (c) EvoLogics GmbH
11.10.2022

Textile Skin & Smart Sensors: Robo-Ray in Search of Munitions

Giant arsenals of unexploded ordinance are sitting on the ocean floor, lost in battle or dumped as waste. The risky job of detecting these underwater hazards is currently given to submarines specially fitted for the purpose. But even they cannot get to some of the tighter or harder to reach spots, forcing expert divers to go down and take over the often life-threatening work.

A German research consortium including Fraunhofer IZM is now using a submarine robot that is as nimble and mobile as a manta ray and equipped with innovative connected sensors on its fins to gather more information about its surroundings. It can measure water pressure so precisely that metal objects can be detected on the ocean floor, even if they are covered by sediment.

Giant arsenals of unexploded ordinance are sitting on the ocean floor, lost in battle or dumped as waste. The risky job of detecting these underwater hazards is currently given to submarines specially fitted for the purpose. But even they cannot get to some of the tighter or harder to reach spots, forcing expert divers to go down and take over the often life-threatening work.

A German research consortium including Fraunhofer IZM is now using a submarine robot that is as nimble and mobile as a manta ray and equipped with innovative connected sensors on its fins to gather more information about its surroundings. It can measure water pressure so precisely that metal objects can be detected on the ocean floor, even if they are covered by sediment.

Unmanned underwater vehicles or UUVs have been in use for several years, but high-tech pioneers for reliable underwater communication and innovative bionics like EvoLogics GmbH have let themselves be inspired by marine life like manta rays and adapted their look and technical anatomy to the submarine world.

With the enormous “wingspan” of their fins, manta rays are known to cover vast distances, while their extremely flexible vertebrae means that they can make surprisingly sharp turns on their seemingly weightless journey through the sea. Their robotic cousins can be very agile as well, but they were not smart enough yet to replace the professional divers who had to scour the sea floor for hours, looking for lost ordinance from the First or Second World War or other hazardous metal waste before offshore wind farms could be built or intercontinental cables could be put down. Now, the new robo ray will make it possible to detect submarine hazards with a whole battery of sensors.

The “Bionic RoboSkin” project, supported by Germany’s Ministry of Education and Research, is working to give the manta-shaped UUVs a flexible bionic sensor skin to help them navigate their underwater world. The skin is made from a compound fabric that is fitted with sensor elements and water-resistant connectors to supply the sensors with power and transmit their data. Researchers from Fraunhofer IZM have taken on the challenge of developing these integrated sensor modules with which the UUVs can detect touch or the proximity of objects and virtually see and analyze their surroundings. The project consortium is headed by EvoLogics GmbH and includes other experts in the field from TITV Greiz, Sensorik Bayern GmbH, the diving specialists of BALTIC Taucherei- und Bergungsbetrieb Rostock GmbH, and GEO-DV GmbH, all with one mission: To create a new generation of robots that can support their human partners with a range of semi or fully automated services and functions.

Their capabilities will not be limited to the sea: The researchers are looking at a second use case for a land-based robot sensor platform, fittingly called “Badger” or “Dachs” in German. It will navigate by GPS and be fitted with ground penetrating radar to detect metal objects below ground or conduct other ground survey work in harder to reach places (including tunneling work).

Under the robotic manta ray’s deceptively lifelike shell lies intricate technology: A permeable and therefore pressure-neutral fabric skin is created and fitted with integrated microelectronics for touch, flow, motion, and position sensors. This textile skin is then pulled tight over the robotic fins, creating a soft robotics machine that can sense its surroundings. The team at Fraunhofer IZM is responsible for the electronics that make this possible: They developed sensor nodes suitable for submersible use that can collect and pre-process the sensor data. These nodes do not only have to be fit for purpose, they also need to be extremely miniaturized to fit underneath the thin fabric skin and integrate the necessary connectors. In active operations below the waterline, these sensors can track parameters like acceleration, pressure, or absorbency. The researchers also included LEDs in the circuit board design that let the robotic manta rays communicate with human divers, for instance to signal a turn.

All of these components and sensor packages are integrated by means of a highly miniaturized embedding method and protected from the cold and wet environment by a robust case. Despite this, the footprint of the embedded modules is amazingly small at 23 x 10.5 x 1.6 mm³, fitting a complete sensor package and microcontroller in something the size of a common door key. The case itself works as a conductor by creating the mechanical and electrical contact with the sensor skin itself. The researchers chose a modular two-part design from their original vision of the product: The embedding module combines the individual electronic components on a millimeter scale for exceptional integration; the module case acts as the mechanical interface with the skin and makes the system as robust as it has to be for its destined purpose. The coupling between module and case relies on a seemingly simple clipping action: Small pins on the connector surface on the skin and tiny hooks on the sensor module itself snap together to form an easily de- and attachable interface. The resulting system is modular to allow easy reconfiguration.

The researchers at Fraunhofer IZM will now subject their robotic manta ray to a series of tests with their project partners. The results and findings from the “Bionic RoboSkin” project will likely be of use for many other projects and contribute to more pressure-neutral and reliable packaging solutions for flexible, mobile, and smarter service robots.

The “Bionic RoboSkin” project is supported through the VDI/VDE-IT by the Ministry of Education and Research (funding code 16ES0914) as part of the federal government’s research and innovation campaign 2016 to 2020 “Microelectronics from Germany – Driver of Innovation for the Digital Economy”.

Source:

Fraunhofer Institute for Reliability and Microintegration IZM

Graphik: Pixabay
11.01.2022

FIMATEC innovation network enters second funding phase

The network for the development of fiber materials technology for healthcare and sports will receive funding from the Central Innovation Programme for SMEs (ZIM) for another two years.

The Federal Ministry for Economic Affairs and Climate Action (BMWi) approved a corresponding application in December 2021. This will continue to provide funding for the development of innovative functional fibers, smart textiles and application-optimized fiber composite materials until June 2023 and strengthen the technological competitiveness and innovative strength of small and medium-sized enterprises (SMEs).

The network for the development of fiber materials technology for healthcare and sports will receive funding from the Central Innovation Programme for SMEs (ZIM) for another two years.

The Federal Ministry for Economic Affairs and Climate Action (BMWi) approved a corresponding application in December 2021. This will continue to provide funding for the development of innovative functional fibers, smart textiles and application-optimized fiber composite materials until June 2023 and strengthen the technological competitiveness and innovative strength of small and medium-sized enterprises (SMEs).

For this purpose, the FIMATEC innovation network combines competences from different engineering and scientific disciplines with small and medium-sized manufacturers and service providers from the target sectors in medicine and sports (e.g. orthopaedics, prosthetics, surgery, smart textiles) as well as players from the textile and plastics industry.      

This interdisciplinary combination of industrial partners and application-oriented research institutions increases competitiveness and enables the players to realise their technical research and development projects quickly and in a targeted manner. The focus for the joint R&D projects of the companies and research institutions is on the development of innovative materials and efficient manufacturing technologies. 
          
Fiber-based materials have become indispensable in many applications in medicine and sports. As a pure fiber, processed into a textile or as a fiber composite plastic, they offer an almost unlimited variety for adjusting property and functional profiles. At the same time, the demands on the range of functions, performance and cost-effectiveness are constantly increasing, so that there is great potential for innovation. Developments are driven on the one hand by new materials and manufacturing processes, and on the other by innovative applications. Products with new and superior functions create a technological advantage over international competitors and enable higher sales revenues. In addition, efficient processes, application-optimized materials or even the integration of functions into the basic structure of textile materials lead to lower production costs and improved marketing opportunities in the future.
For developments in this context, the partners have joined forces in the FIMATEC innovation network, thus combining their expertise. Within the network, innovative materials and processes are being developed jointly in the following areas and tested in future-oriented products and services:

  • Functional fibers
    Innovative fiber materials with integrated functionalities
  • Preforming
    Highly load path optimized fiber orientations for complex fiber composite components.    
  • Smart Textiles
    Textile-based sensors and actuators
  • Hybrid material and manufacturing technologies
    Application-optimized components through cross-technology solution approaches.    
  • Fiber composites  
    Intelligent matrix systems and function-optimized fiber materials.    
  • Fiber-reinforced 3D printing  
    High-quality additive manufacturing processes for the efficient production of individualized products.

 
17 network partners are researching fiber-based materials for medical and sports technologyCurrently, ten companies and seven research institutions are involved in FIMATEC. Interested companies and research institutions as well as potential users can continue to participate in the cooperation network or R&D projects. In the course of membership, the partners are actively supported in identifying and initiating innovation projects as well as securing financing through funding acquisition. One application for ZIM project funding has already been approved by FIMATEC in its first year.

The aim of the already approved project "CFKadapt" is to develop a thermoformable fiber-plastic composite material for optimally adaptable orthopedic aids such as prostheses and orthoses. In the "Modul3Rad" project, which is currently being worked out in detail, the project partners intend to develop a modular lightweight frame system for the construction of user-friendly therapy tricycles, suitable for everyday use by severely and very severely disabled children. Three further collaborative projects are already in the planning stage.

The technology and knowledge transfer enables in particular small and medium-sized enterprises (SMEs) to access cutting-edge technological research, especially these are often denied access to innovations due to the lack of their own research departments. The IWS GmbH has taken over the network management for FIMATEC and supports the partners from the first idea to the search for suitable project partners and the preparation and coordination of funding applications. The aim is to obtain funding from the Central Innovation Programme for SMEs (ZIM), which offers companies funding opportunities for a wide range of technical innovation projects in cooperation with research institutions.

FIMATEC-netzwork partners
all ahead composites GmbH | Veitshöchheim | www.bike-ahead-composites.de
Altropol Kunststoff GmbH | Stockelsdorf | www.altropol.de
Diondo GmbH | Hattingen | www.diondo.com
Mailinger innovative fiber solutions GmbH | Sontra | www.mailinger.de
Sanitätshaus Manfred Klein GmbH & Co. KG | Stade | www.klein-sanitaetshaus.de
STREHL GmbH & Co KG | Bremervörde | www.rehastrehl.de
WESOM Textil GmbH | Olbersdorf | www.wesom-textil.de
Faserinstitut Bremen e.V. (FIBRE) | www.faserinstitut.de
E.F.M. GmbH | Olbersdorf | www.efm-gmbh.de
REHA-OT Lüneburg Melchior und Fittkau GmbH | Olbersdorf | www.rehaot.de
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM | Bremen | www.ifam.fraunhofer.de
Leibniz-Institut für Polymerforschung Dresden e.V. (IPF) | www.ipfdd.de
Institut für Polymertechnologien Wismar e.V. (IPT) | www.ipt-wismar.de
Institut für Verbundwerkstoffe GmbH | Kaiserslautern | www.ivw.uni-kl.de

Associated network partners
9T Labs AG | Zürich, Schweiz | www.9tlabs.com
Fachhochschule Nordwestschweiz, Institut für Kunststofftechnik (FHNW) | www.fhnw.ch
KATZ - Kunststoff Ausbildungs- und Technologie-Zentrum | Aarau, Schweiz | www.katz.ch

Source:

Textination / IWS Innovations- und Wissensstrategien GmbH