The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Fiber-optic Goniometer to Measure Knee Joint Angle for the Diagnosis of Gait Disturbance

보행장애 진단을 위한 무릎관절 각도 측정용 광섬유 각도센서

  • Kim, S.G. (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Shin, S.H. (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Jeon, D. (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Hong, S.H. (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Sim, H.I. (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Jang, K.W. (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Yoo, W.J. (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Lee, B. (Dept. of Biomedical Engineering, Konkuk University)
  • 김선근 (건국대학교 일반대학원 의학공학과) ;
  • 신상훈 (건국대학교 일반대학원 의학공학과) ;
  • 전다영 (건국대학교 일반대학원 의학공학과) ;
  • 홍승한 (건국대학교 일반대학원 의학공학과) ;
  • 심혁인 (건국대학교 일반대학원 의학공학과) ;
  • 장경원 (건국대학교 일반대학원 의학공학과) ;
  • 유욱재 (건국대학교 일반대학원 의학공학과) ;
  • 이봉수 (건국대학교 의학공학부)
  • Received : 2013.02.25
  • Accepted : 2013.05.12
  • Published : 2013.07.01
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Abstract

In this study, we developed a fiber-optic goniometer for the continuous measurement of knee joint angle which provides important medical information on Alzheimer's disease. The fiber-optic goniometer is composed of a light-emitting diode (LED), a plastic optical fiber (POF), and a voltage output photodiode (PD). As a sensing part of the fiber-optic goniometer, a unclad fiber with regular intervals of 1 mm was fabricated to improve efficiency of bending loss according to the angle variation of knee joint. The emitting light with a center wavelength of 470 nm from a LED is guided by a POF to the PD, the transmitted light is then attenuated by the bending loss inside the bent POF. The intensity variation of the light transmitted from the POF gives rise to a change in output voltage in the fiber-optic goniometer. Therefore, we measured the real-time output voltage of the proposed fiber-optic goniometer using the unclad fiber according to the knee joint angle. Through the repeated experiments, the fiber-optic goniometer shows that it has a reversibility and a wide measurable angle range.

Keywords

References

  1. J. S. Choi, H. S. Oh, D. W. Kang, K. R. Mun, M. H. Choi, S. J. Lee, S. C. Jeong, G. R. Tack, "Comparison of Differences among Alzheimer's Disease, Mild Cognitive Impairment and Healthy Elderly using Gait and Cognitive function," Korean Society for Precision Engineering, Vol. 10, pp. 1403-04, 2010.
  2. W. A. Sands and M. H. Stone, "Monitoring the elite athlete," USOC Olympic Coach E-Mag., vol. 17, no. 3, Fall 2005. [Online]. Available: http://coaching.usolympicteam.com/coaching/kpub.nsf/
  3. D. M. Karantonis, M. R. narayanan, M. Mathie, N. H. Lovell, and B. G. Celler, "Implementation of a real-time human movement classifier using a triaxial accelerometer for ambulatory monitoring," IEEE Trans. Inf. Technol. Biomed., vol. 10, no. 1, pp. 156-157, Jan. 2006 https://doi.org/10.1109/TITB.2005.856864
  4. B. Culshaw and J. Dakin, Optical Fiber Sensors: Systems and Applications. Boston, MA: Artech House, 1989.
  5. E. Udd, Fiber-Optic Sensors for Scientists and Engineers. New York: Wiley, 1993.
  6. J. Dunphy, G. meltz, and W. Morey, "Optical fiber Bragg grating sensors: A candidate for smart structure applications,"in Fiber-Optic Smart Structures, E. Udd, Ed. New York: Wiley, ch. 10.
  7. D. A Winter, Biomechanics and Motor Control of Human Movement, 3rdedition, NewYork, USA; Wiley&Sons, 2005.
  8. M. M. Patil and O. Prohaska, "Fiber-optic sensor for joint angle measurement," in Proc. Annu. Int. Conf. IEEE Eng. Med. Biol. Soc., vol. 2, pp. 803-804, Nov. 4-7, 1988.