Joint angle measurement by stretchable strain sensor
Joint angle measurement by stretchable strain sensor
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DOI：
10.1007/s12652-018-0915-z
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发表时间：
2018-06
影响因子：
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通讯作者：
Hiroyuki Nakamoto;Tokiya Yamaji;I. Hirata;Hideo Ootaka;F. Kobayashi
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文献类型：
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作者：
Hiroyuki Nakamoto;Tokiya Yamaji;I. Hirata;Hideo Ootaka;F. Kobayashi
在专业和业余体育运动以及医疗保健服务中，需要测量身体运动，以改善和评估人体运动。本研究提出一种测量关节角度的方法。该方法的关键器件是可伸缩应变传感器。应变传感器在低弹性的应变下拉伸超过200%，并以高精度测量应变量。应变传感器的主要优点是其薄、重量轻和低弹性模量。如果应变传感器附着在关节上的人体皮肤上，它不会阻碍关节运动，因此可以测量皮肤的拉伸。该方法基于简单的力学模型从皮肤拉伸估计关节角度。在实验中，应变传感器被应用于膝关节和踝关节。运动捕捉测量的参考关节角度与估计角度之间的平均误差在5°以内。
Measurement of body motion is required in professional and amateur sports and in health-care services for the improvement and evaluation of human motion. This study proposes a method for measuring joint angles. The key device in this method is a stretchable strain sensor. The strain sensor stretches over 200% under strain with low elasticity and measures the amount of strain with high accuracy. The key advantages of the strain sensor are its thinness, light weight, and low elastic modulus. If the strain sensor is attached on human skin over a joint, it does not impede joint motion and can therefore measure the stretch of the skin. The proposed method estimates the joint angle from skin stretching based on simple mechanical models. In an experiment, the strain sensors were applied to knee and ankle joints. The average error between the estimated angles and reference joint angles measured by motion capture was within 5°.