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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 21 — Jul. 20, 2011
  • pp: 3742–3749

Intermodal interferometer for strain and temperature sensing fabricated in birefringent boron doped microstructured fiber

G. Statkiewicz-Barabach, J. P. Carvalho, O. Frazão, J. Olszewski, P. Mergo, J. L. Santos, and W. Urbanczyk  »View Author Affiliations

Applied Optics, Vol. 50, Issue 21, pp. 3742-3749 (2011)

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We present a compact in-line fiber interferometric sensor fabricated in a boron doped two-mode highly birefringent microstructured fiber using a CO 2 laser. The intermodal interference arises at the fiber output due to coupling between the fundamental and the first order modes occurring at two fiber tapers distant by a few millimeters. The visibility of intermodal interference fringes is modulated by a polarimetric differential signal and varies in response to measurand changes. The proposed interferometer was tested for measurements of the strain and temperature, respectively, in the range of 20 700 ° C and 0 17 mstrain . The sensitivity coefficients corresponding to fringe displacement and contrast variations are equal respectively for strain 2.51 nm / mstrain and 0.0256 1 / mstrain and for temperature 16.7 pm / ° C and 5.74 × 10 5 1 / ° C . This allows for simultaneous measurements of the two parameters by interrogation of the visibility and the displacement of interference fringes.

© 2011 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(060.4005) Fiber optics and optical communications : Microstructured fibers

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 1, 2011
Revised Manuscript: May 17, 2011
Manuscript Accepted: May 23, 2011
Published: July 11, 2011

G. Statkiewicz-Barabach, J. P. Carvalho, O. Frazão, J. Olszewski, P. Mergo, J. L. Santos, and W. Urbanczyk, "Intermodal interferometer for strain and temperature sensing fabricated in birefringent boron doped microstructured fiber," Appl. Opt. 50, 3742-3749 (2011)

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