Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 28, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6501/aa946f
Keywords
fiber optic sensors; polymer optical fiber; angle measurement
Funding
- CAPES [88887.095626/2015-01]
- FAPES [67566480, 72982608]
- CNPq [304192/2016-3]
- Petrobras grant [23068.013529/2012-56]
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Polymer optical fiber (POF) curvature sensors present some advantages over conventional techniques for angle measurements, such as their light weight, compactness and immunity to electromagnetic fields. However, high hysteresis can occur in POF curvature sensors due to the polymer viscoelastic response. In order to overcome this limitation, this paper shows how the hysteresis sensor can be compensated by a calibration equation relating the measured output signal to the sensor's angular velocity. The proposed method is validated using an exoskeleton with an active joint on the knee for flexion and extension rehabilitation exercises. The results show a decrease in sensor hysteresis and a decrease by more than two times in the error between the POF sensor and the potentiometer, which is employed for the angle measurement of the exoskeleton knee joint.
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