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A new optical technique to monitor joint motion using position sensitive detector
Gu-In Jung1, Byung Kyu Park2, Ji-Sun Kim1
1Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
Background:
Evaluation of joint movements is essential to choose an appropriate rehabilitation protocol for a patient.
Objective:
The aim of this study is to suggest an alternative optical technique for measurement of joint angle which is convenient, inexpensive, and can be operated in real time.
Methods:
According to the principle of the triangulation method, position sensitive detector (PSD) converts reflected light signals into distance-related voltages. Various parameters were investigated to increase detection range and resolution of joint angle measurements.
Results:
The accuracy of the suggested optical sensor was verified by comparing with a commercial goniometer and 3D motion capture system.
Conclusions:
This method can be applied to monitor recovery progress for the patient in rehabilitation and sport science.
