Department of Mechanical & Automotive Engineering, Youngsan University, Junam-ro 288, Yangsan-si 48015, Korea.
Sensors (Basel). 2022 Mar 14;22(6):2236. doi: 10.3390/s22062236.
In this study, we developed a fabrication method for a bracelet-type wearable sensor to detect four motions of the forearm by using a carbon-based conductive layer-polymer composite film. The integral material used for the composite film is a polyethylene terephthalate polymer film with a conductive layer composed of a carbon paste. It is capable of detecting the resistance variations corresponding to the flexion changes of the surface of the body due to muscle contraction and relaxation. To effectively detect the surface resistance variations of the film, a small sensor module composed of mechanical parts mounted on the film was designed and fabricated. A subject wore the bracelet sensor, consisting of three such sensor modules, on their forearm. The surface resistance of the film varied corresponding to the flexion change of the contact area between the forearm and the sensor modules. The surface resistance variations of the film were converted to voltage signals and used for motion detection. The results demonstrate that the thin bracelet-type wearable sensor, which is comfortable to wear and easily applicable, successfully detected each motion with high accuracy.
在这项研究中，我们开发了一种制造方法，用于制造一种手镯式可穿戴传感器，该传感器使用基于碳的导电层-聚合物复合膜来检测前臂的四个运动。用于复合膜的整体材料是聚对苯二甲酸乙二醇酯聚合物膜，其导电层由碳糊组成。它能够检测到由于肌肉收缩和松弛而导致的身体表面弯曲变化对应的电阻变化。为了有效地检测薄膜的表面电阻变化，设计并制造了一个由安装在薄膜上的机械部件组成的小传感器模块。一个测试对象在前臂上佩戴了由三个这样的传感器模块组成的手镯传感器。薄膜的表面电阻随着前臂和传感器模块之间的接触面积的弯曲变化而变化。薄膜的表面电阻变化被转换为电压信号，用于运动检测。结果表明，这种轻薄的手镯式可穿戴传感器佩戴舒适，易于应用，能够高精度地检测到每个运动。
