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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 28 — Oct. 1, 2012
  • pp: 6886–6895

Self-repairing, interferometric waveguide sensor with a large strain range

Young J. Song and Kara J. Peters  »View Author Affiliations

Applied Optics, Vol. 51, Issue 28, pp. 6886-6895 (2012)

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We demonstrate a polymer waveguide, Fabry–Perot interferometer strain sensor fabricated through a self-writing process in a photopolymerizable resin bath between two silica optical fibers. The measurable strain range is extended through sensor self-repair and strain measurements are demonstrated up to 150% applied tensile strain. The sensor fabrication and repair is performed in the ultraviolet wavelength range, while the sensor interrogation is performed in the near-infrared wavelength range. A hybrid sensor is fabricated by splicing a short segment of multimode optical fiber to the input single-mode optical fiber. The hybrid sensor provides the high quality of waveguide fabrication previously demonstrated through self-writing between multimode optical fibers with the high fringe visibility of single-mode propagation. The peak frequency shift of the reflected spectrum Fabry–Perot sensor is extremely linear with applied strain for the hybrid sensor, with a sensitivity of 2.3 × 10 3 per nanometer per percent strain. The calibrated peak frequency shift with applied strain is the same for both the original sensor and the repaired sensor; therefore, the fact that the sensor has self-repaired does not need to be known. Additionally, this calibration is the same between multiple sensor fabrications. In contrast to a conventional air gap Fabry–Perot cavity sensor, no decrease in the fringe visibility is observed over the measurable strain range.

© 2012 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: June 22, 2012
Revised Manuscript: September 1, 2012
Manuscript Accepted: September 4, 2012
Published: September 28, 2012

Young J. Song and Kara J. Peters, "Self-repairing, interferometric waveguide sensor with a large strain range," Appl. Opt. 51, 6886-6895 (2012)

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