A new optical technique to monitor joint motion using position sensitive detector

Gu In Jung, Byung Kyu Park, Ji Sun Kim, Tae Hee Lee, Ju Hyeon Choi, Han Byeol Oh, A. Hee Kim, Bong Jun Goh, Ji Won Kim, Ki Sung Lee, Jae Hoon Jun

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)S473-S480
JournalTechnology and Health Care
Publication statusPublished - 2015 Jun 17
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 - IOS Press and the authors. All rights reserved.


  • Human joint angle
  • optical goniometer
  • position sensitive detector
  • range of motion
  • rehabilitation

ASJC Scopus subject areas

  • Information Systems
  • Bioengineering
  • Health Informatics
  • Biophysics
  • Biomedical Engineering
  • Biomaterials


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