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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Published on: September 30, 2019

Quasi-distributed refractometer using tilted Bragg gratings and time domain reflectometry.

Christophe Caucheteur1, Marc Wuilpart, Chengkun Chen

  • 1Electromagnetism and Telecom Unit, Faculté Polytechnique de Mons, Mons, Belgium. christophe.caucheteur@fpms.ac.be

Optics Express
|October 30, 2008
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Summary

Commercial Optical Time Domain Reflectometers (OTDRs) can now multiplex identical Tilted Fiber Bragg Grating (TFBG) refractometers. This cost-effective method enables quasi-distributed refractive index sensing for monitoring long structures.

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Area of Science:

  • Optics and Photonics
  • Fiber Optic Sensing
  • Materials Science

Background:

  • Tilted Fiber Bragg Gratings (TFBGs) function as precise refractometers by coupling light into the fiber cladding.
  • Existing demodulation techniques are unsuitable for quasi-distributed sensing due to extensive spectral measurement requirements.
  • Cascading TFBGs for sensing along a single fiber presents significant technical challenges.

Purpose of the Study:

  • To demonstrate a novel method for multiplexing identical TFBG refractometers on a single optical fiber.
  • To adapt commercial Optical Time Domain Reflectometry (OTDR) for quasi-distributed refractive index sensing.
  • To provide a cost-effective and efficient solution for monitoring extended structures.

Main Methods:

  • Utilizing a commercial Optical Time Domain Reflectometer (OTDR) for signal analysis.
  • Writing identical TFBGs along a single optical fiber.
  • Developing a demodulation technique compatible with OTDR measurements for TFBG arrays.

Main Results:

  • Successfully multiplexed identical TFBG refractometers using a commercial OTDR.
  • Achieved quasi-distributed refractive index sensing capabilities.
  • Demonstrated the feasibility of monitoring long structures with cascaded TFBGs.

Conclusions:

  • A commercial OTDR is a viable tool for multiplexing TFBG refractometers.
  • This approach offers a simple, fast, and cost-effective solution for quasi-distributed sensing.
  • The technique is particularly advantageous for structural health monitoring applications over long distances.