Recently, a research team from the Wisconsin Institute of Heuristic Engineering at Harvard University and the John Paulson School of Engineering and Applied Science created a highly sensitive, flexible capacitive sensor. It consists of silicone and fabric, with the body movement and bending, accurate and accurate monitoring of human movement.
Today, from heart-rate monitors to virtual reality helmets, a wide range of wearable technology products have shown explosive growth and prevalence in consumer electronics markets and research.
However, to detect and transmit data, most of the electronic sensors used in these wearable devices are made of hard, inflexible materials, which not only limits the wearer's natural movement but also affects the accuracy of the collected data.
Innovation
Recently, a team of researchers from the Wyss Institute for Biologically Inspired Engineering and the John Paulson School of Engineering and Applied Science (SEAS) created a highly sensitive flexible capacitive sensor , Which consists of silicone and fabric, with the human body movement and bending, accurate and accurate detection of human motion.
The research paper was published in the latest issue of Advanced Materials Technology magazine and is part of the Harvard Bio-Design Lab Flexible Robot Kit.
composition
Capacitive sensors consist of a thin layer of silicon sheet, a poorly conductive material, sandwiched between two layers of silver-plated conductive fabric, a highly conductive material.
principle
This sensor records human motion by measuring changes in capacitance. The so-called capacitance, that is, the ability to accommodate the charge, also refers to the electric field between the two electrodes.
Daniel Vogt, a research scientist at Davis and co-author of the paper, said:
"When we pull the sensor at one end of the sensor and apply tension, the silicone layer gets thinner and the conductive fabric layer gets closer, which alters the sensor's capacitance in a way that is proportional to the applied tension. So, we can measure how much the sensor shape has changed. "
Process
The superior performance of this hybrid sensor comes from its new manufacturing process. Through this manufacturing process, the fabric passes through another layer of liquid silicone that is attached to both ends of the silica gel core. This method allows the silica gel to fill the air gap in the fabric and mechanically lock it to the silica gel, increasing the surface area used to distribute tension and storage capacitance.
This mixture of silicone and fabric improves the sensitivity to motion by taking full advantage of the properties of both materials. When pulled up, this tough, interlocking fabric helps silica gel to limit the extent of its deformation; and when pulled, silica gel helps the fabric restore its original shape. Lastly, the soft, thin thread is permanently attached to the conductive fabric by a heat-sealable tape that allows the electrical information from the sensor to be transmitted to the circuit without the need for a hard, bulky interface.
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