Improving Kinematic Accuracy of Soft Wearable Data Gloves by Optimizing Sensor Locations

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Bending sensors enable compact, wearable designs when used for measuring hand configurations in data gloves. While existing data gloves can accurately measure angular displacement of the finger and distal thumb joints, accurate measurement of thumb carpometacarpal (CMC) joint movements remains challenging due to crosstalk between the multi-sensor outputs required to measure the degrees of freedom (DOF). To properly measure CMC-joint configurations, sensor locations that minimize sensor crosstalk must be identified. This paper presents a novel approach to identifying optimal sensor locations. Three-dimensional hand surface data from ten subjects was collected in multiple thumb postures with varied CMC-joint flexion and abduction angles. For each posture, scanned CMC-joint contours were used to estimate CMC-joint flexion and abduction angles by varying the positions and orientations of two bending sensors. Optimal sensor locations were estimated by the least squares method, which minimized the difference between the true CMC-joint angles and the joint angle estimates. Finally, the resultant optimal sensor locations were experimentally validated. Placing sensors at the optimal locations, CMC-joint angle measurement accuracies improved (flexion, 2.8 degrees +/- 1.9 degrees; abduction, 1.9 degrees +/- 1.2 degrees). The proposed method for improving the accuracy of the sensing system can be extended to other types of soft wearable measurement devices
Publisher
MDPI AG
Issue Date
2016-06
Language
English
Article Type
Article
Citation

SENSORS, v.16, no.6

ISSN
1424-8220
DOI
10.3390/s16060766
URI
http://hdl.handle.net/10203/212276
Appears in Collection
ME-Journal Papers(저널논문)
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