Department of Clothing &Textiles, Yonsei University, Seoul 03722, Korea.
Sensors (Basel). 2021 Feb 1;21(3):949. doi: 10.3390/s21030949.
In this study, a strain gauge sensor based on a change of contact or network structure between conductive materials was implemented using the handle-machine embroidery technique, and the variables (embroidery shape, embroidery distance, embroidery size, and implementation location) affecting its performance were studied. As a result of Experiment I on the structure of embroidery suitable for joint motion monitoring, the embroidery distance, rather than the embroidery size, was found to have a significant effect on the electric resistance changes caused by elongation. Based on the results of Experiment I, two types of zigzag embroideries, four types of embroideries with few contact points, and two types of embroideries with more contact points (all with short distances (2.0)) were selected for Experiment II (the dummy motion experiment). As a result of the dummy motion experiment, it was found that the locations of the suitable embroidered sensors for joint motion monitoring was the HJP (Hinge Joint Position) in the 'types without a contact point' (zigzag) and the LHJP (Lower Hinge Joint Position) in the 'types with more contact points'. On the other hand, although there was no consistency among the 'types with few contact points', the resistance changes measured by the 2CP and 7CP embroidered sensors showed similar figures and patterns, and the HJP location was most suitable. The resistance changes measured by the 4CP and 6CP embroidered sensors exhibited no consistent patterns, but the LHJP locations were more suitable. These results indicate that the location of the HJP is suitable for measuring joint motion in the 'type without a contact point', and the location of the LHJP is suitable for measuring joint motion when the number of contact points exceeds a certain limit. Among them, the average resistance change of the 9CP sensor located at the LHJP was 40 Ω with the smallest standard deviation of less than 1, and it is thus considered to have the best performance among all the sensors.
在这项研究中，使用手柄缝纫机刺绣技术实现了一种基于导电材料接触或网络结构变化的应变计传感器，并研究了影响其性能的变量（刺绣形状、刺绣距离、刺绣尺寸和实施位置）。作为适合关节运动监测的刺绣结构的实验 I 的结果，发现是刺绣距离而不是刺绣尺寸对伸长引起的电阻变化有显著影响。基于实验 I 的结果，选择了两种类型的之字形刺绣、四种接触点较少的刺绣类型和两种接触点较多的刺绣类型（所有距离均为 2.0）进行实验 II（模拟运动实验）。作为模拟运动实验的结果，发现适合关节运动监测的传感器的位置是 HJP（铰链关节位置）在“无接触点类型”（之字形）和 LHJP（下铰链关节位置）在“接触点较多的类型”。另一方面，虽然“接触点较少的类型”之间没有一致性，但通过 2CP 和 7CP 刺绣传感器测量的电阻变化显示出相似的数字和模式，并且 HJP 位置是最合适的。通过 4CP 和 6CP 刺绣传感器测量的电阻变化没有一致的模式，但 LHJP 位置更合适。这些结果表明，HJP 位置适合测量无接触点类型的关节运动，而当接触点数量超过一定限制时，LHJP 位置适合测量关节运动。其中，位于 LHJP 的 9CP 传感器的平均电阻变化为 40 Ω，标准偏差小于 1，因此被认为是所有传感器中性能最好的。
