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Keywords = reflective photomicrosensor

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15 pages, 3604 KiB  
Article
Development of a Bendable Outsole Biaxial Ground Reaction Force Measurement System
by Junghoon Park, Sangjoon Jonathan Kim, Youngjin Na, Yeongjin Kim and Jung Kim
Sensors 2019, 19(11), 2641; https://doi.org/10.3390/s19112641 - 11 Jun 2019
Cited by 12 | Viewed by 5202
Abstract
Wearable ground reaction force (GRF) measurement systems make it possible to measure the GRF in any environment, unlike a commercial force plate. When performing kinetic analysis with the GRF, measurement of multiaxial GRF is important for evaluating forward and lateral motion during natural [...] Read more.
Wearable ground reaction force (GRF) measurement systems make it possible to measure the GRF in any environment, unlike a commercial force plate. When performing kinetic analysis with the GRF, measurement of multiaxial GRF is important for evaluating forward and lateral motion during natural gait. In this paper, we propose a bendable GRF measurement system that can measure biaxial (vertical and anterior-posterior) GRF without interrupting the natural gait. Eight custom small biaxial force sensors based on an optical sensing mechanism were installed in the proposed system. The interference between two axes on the custom sensor was minimized by the independent application of a cantilever structure for the two axes, and the hysteresis and repeatability of the custom sensor were investigated. After developing the system by the installation of force sensors, we found that the degree of flexibility of the developed system was comparable to that of regular shoes by investigating the forefoot bending stiffness. Finally, we compared vertical GRF (vGRF) and anterior-posterior GRF (apGRF) measured from the developed system and force plate at the same time when the six subjects walked, ran, and jumped on the force plate to evaluate the performance of the GRF measurement system. Full article
(This article belongs to the Special Issue Wearable Sensors and Devices for Healthcare Applications)
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