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Sensors 2018, 18(8), 2588; https://doi.org/10.3390/s18082588

Physical Extraction and Feature Fusion for Multi-Mode Signals in a Measurement System for Patients in Rehabilitation Exoskeleton

State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
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Received: 19 June 2018 / Revised: 2 August 2018 / Accepted: 3 August 2018 / Published: 7 August 2018
(This article belongs to the Section Physical Sensors)
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Abstract

Measurement system of exoskeleton robots can reflect the state of the patient. In this study, we combined an inertial measurement unit and a visual measurement unit to obtain a repeatable fusion measurement system to compensate for the deficiencies of the single data acquisition mode used by exoskeletons. Inertial measurement unit is comprised four distributed angle sensors. Triaxial acceleration and angular velocity information were transmitted to an upper computer by Bluetooth. The data sent to the control center were processed by a Kalman filter to eliminate any noise. Visual measurement unit uses camera to acquire real time images and related data information. The two data acquisition methods were fused and have its weight. Comparisons of the fusion results with individual measurement results demonstrated that the data fusion method could effectively improve the accuracy of system. It provides a set of accurate real-time measurements for patients in rehabilitation exoskeleton and data support for effective control of exoskeleton robot. View Full-Text
Keywords: inertial measurement unit; visual measurement unit; data fusion; exoskeleton robot; Kalman filter inertial measurement unit; visual measurement unit; data fusion; exoskeleton robot; Kalman filter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yang, C.; Wei, Q.; Wu, X.; Ma, Z.; Chen, Q.; Wang, X.; Wang, H.; Fan, W. Physical Extraction and Feature Fusion for Multi-Mode Signals in a Measurement System for Patients in Rehabilitation Exoskeleton. Sensors 2018, 18, 2588.

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