Abstract
The electronic textile area has gained considerable attention due to its implementation of wearable devices, and soft sensors are the main components of these systems. In this paper, a new sensor design is presented to create stretchable, capacitance-based strain sensors for human motion tracking. This involves the use of stretchable, conductive-knit fabric within the silicone elastomer matrix, as interdigitated electrodes. While conductive fabric creates a secure conductive network for electrodes, a silicone-based matrix provides encapsulation and dimensional-stability to the structure. During the benchtop characterization, sensors show linear output, i.e., R2 = 0.997, with high response time, i.e., 50 ms, and high resolution, i.e., 1.36%. Finally, movement of the knee joint during the different scenarios was successfully recorded.
Highlights
Electronic textiles have recently gained considerable research interest due to their possible application opportunities in different areas, such as human motion monitoring [1,2,3], soft robotics [4,5], physiological monitoring [6,7,8], temperature measurement [9,10], and human–machine interfaces [11,12]
In this capacitive sensor design, W is equal to 65 mm, t is equal to 0.45 mm, d is equal to 0.35 mm, and n is equal to 5, as shown in Figures 3 and 4
When strain is applied to the sensor, the distance between the electrodes decreases, i.e., 0.28 mm, due to Poisson’s ratio (Ecoflex poisson’s ratio is around 0.5) effect, which means the width of the silicone elastomer decreases when the structure is stretched
Summary
Electronic textiles have recently gained considerable research interest due to their possible application opportunities in different areas, such as human motion monitoring [1,2,3], soft robotics [4,5], physiological monitoring [6,7,8], temperature measurement [9,10], and human–machine interfaces [11,12]. Sensors can be described as devices that detect a change in physical stimulus and translate it into a signal that can be measured or recorded [13]. Among these structures, soft, stretchable strain sensors are gaining attention due to the large application opportunity in the aforementioned areas. The measurement principle of the resistive method relies on a change in the electrical resistance value of the conductive structure upon applied strain [14]
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