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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 11 — Nov. 26, 2007

Fiber Bragg grating displacement sensor for movement measurement of tendons and ligaments

Liang Ren, Gangbing Song, Michael Conditt, Philip C. Noble, and Hongnan Li  »View Author Affiliations

Applied Optics, Vol. 46, Issue 28, pp. 6867-6871 (2007)

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Biomechanical studies often involve measurements of the strains developed in tendons or ligaments in posture or locomotion. Fiber-optic sensors present an attractive option for the measurement of strains in tendons and ligaments because of their low cost, ease of implementation, and increased accuracy compared with other implantable transducers. A new displacement sensor based on a fiber Bragg grating and shape memory alloy technology is proposed for the monitoring of tendon and ligament strains in different postures and in locomotion. After sensor calibration in the laboratory, a comparison of the fiber sensors and traditional camera displacement sensors was carried out to evaluate the performance of the fiber sensor during the application of tension to the Achilles tendon. Additional experiments were performed in cadaver knees to assess the suitability of these fiber sensors to measure ligament deformation in a variety of simulated postures. The results demonstrate that the proposed fiber Bragg grating sensor is a highly accurate, easily implantable, and minimally invasive method of measuring tendon and ligament displacement.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(170.3890) Medical optics and biotechnology : Medical optics instrumentation

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 14, 2007
Revised Manuscript: June 23, 2007
Manuscript Accepted: July 20, 2007
Published: September 21, 2007

Virtual Issues
Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics

Liang Ren, Gangbing Song, Michael Conditt, Philip C. Noble, and Hongnan Li, "Fiber Bragg grating displacement sensor for movement measurement of tendons and ligaments," Appl. Opt. 46, 6867-6871 (2007)

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