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Smart printed sensors monitor movement sequences
11
May '16
Courtesy: Fraunhofer Institute
Courtesy: Fraunhofer Institute
Wearable technology is turning a new leaf. Simply worn on the body, smart garments can, for instance, track activity. Sensors in functional clothing could also help optimize exercises by monitoring movement sequences. A novel transparent sensor material developed by Fraunhofer ISC enables movement measuring sensors to be printed onto textiles.

The innovative material was presented on IDTechEX Europe in the Estrel Berlin recently.

Germany's Fraunhofer Institute for Silicate Research ISC conducts materials research with a view to developing innovative non-metallic materials.

Accessories like smart bracelets or smart watches are trending as “personal health coaches”, prompting the bearer to provide for sufficient sleep and activity or a healthy diet. Sensor-embedded textile solutions are a far more challenging and also more expensive approach. Often, function will override appearance. The new materials developed by Fraunhofer ISC might offer a cost-efficient alternative with the extra benefit of more adjustable appearance options, it said in a press release.

In cooperation with Fraunhofer ISIT and with support of the project partners from the industry, the new sensor technology will be incorporated into a prototype shirt. This so-called MONI shirt will feature a number of functions but is foremost designed to monitor movement sequences. In an initial step, Fraunhofer ISC has developed novel piezoelectric polymer sensor printing pastes free from toxic solvents while Fraunhofer ISIT has provided the evaluation electronics.

The next development steps are planned in close dialogue with the industry partners. They will include field tests on several types of textiles and applications, the further optimization of the electronics as well as wear and washability tests.

The sensor materials coming to use are flexible, transparent and suitable for various applications also beside of smart textiles: They register pressure and deformation and can thus serve as touch or motion sensors. Their sensitivity to temperature deviations further enables monitoring of temperature changes or non-contact interaction, e. g. as proximity sensors.

A simple screen printing process is all it takes to apply the sensor pastes onto textile fabrics or plastic films. Manufacturing encompasses two steps: First, the pattern is printed. Then, the sensors are subjected to an electric field making the piezolectric polymers align to adopt the targeted pressure sensitivity. The cost-efficient screen printing process is a definite plus when it comes to industrial use. It is the key to mass production of printed sensors on textiles.

Thanks to its transparency and flexibility, the new sensor material offers freedom of design in color and form for textiles and garments. As the sensors are much thinner than a human hair and applicable in whatever form, the wearer will hardly notice them embedded in a garment. There's yet another benefit: the sensors do not require any power source like a battery. Instead, they harvest energy.

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