Oh You-Kyung, Kim Youn-Hee
Department of Convergence Design and Technology, Kookmin University, Seoul 02707, Republic of Korea.
Sensors (Basel). 2024 Nov 27;24(23):7581. doi: 10.3390/s24237581.
We developed a sensor optimized for joint motion monitoring by exploring the effects of the stitch pattern, yarn thickness, and NP number on the performance of knitted strain sensors. We conducted stretching experiments with basic weft-knit patterns to select the optimal stitch pattern and analyze its sensitivity and reproducibility. The plain stitch with a conductive yarn located on the reverse side exhibited the highest gauge factor value (143.68) and achieved excellent performance, with a stable change in resistance even after repeated sensing. For an in-depth analysis, we developed six sensors using the aforementioned pattern with different combinations of yarn thickness (1-ply, 2-ply) and NP numbers (12, 13, 14). Based on bending experiments, the GF across all sensors was 60.2-1092, indicating noticeable differences in sensitivity. However, no significant differences were observed in reproducibility, reliability, and responsiveness, confirming that all the sensors are capable of joint motion monitoring. Therefore, the plain-patterned plating stitch structure with conductive yarn on the reverse side is optimal for joint motion monitoring, and the yarn thickness and NP numbers can be adjusted to suit different purposes. This study provides basic data for developing knitted strain sensors and offers insights into how knitting methods impact sensor performance.
我们通过探究线圈结构、纱线粗细和节点数对针织应变传感器性能的影响，开发了一种针对关节运动监测进行优化的传感器。我们使用基本纬编图案进行拉伸实验，以选择最佳线圈结构并分析其灵敏度和可重复性。导电纱线位于反面的平针线圈具有最高的应变片系数值（143.68），并表现出优异的性能，即使在反复传感后电阻仍能稳定变化。为了进行深入分析，我们使用上述图案开发了六个传感器，这些传感器采用了不同的纱线粗细（1股、2股）和节点数（12、13、14）组合。基于弯曲实验，所有传感器的应变片系数为60.2 - 1092，表明灵敏度存在显著差异。然而，在可重复性、可靠性和响应性方面未观察到显著差异，这证实了所有传感器都能够进行关节运动监测。因此，导电纱线位于反面的平针添纱线圈结构对于关节运动监测是最佳的，并且可以调整纱线粗细和节点数以适应不同目的。本研究为开发针织应变传感器提供了基础数据，并深入探讨了针织方法如何影响传感器性能。
