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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Highly sensitive in-fiber interferometric refractometer with temperature and axial strain compensation.

Jeremie Harris1, Ping Lu, Hugo Larocque

  • 1Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.

Optics Express
|April 24, 2013
PubMed
Summary

This study introduces a new fiber-optic refractometer for accurate refractive index measurement. It compensates for temperature and strain, enabling simultaneous detection of multiple environmental variables.

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Area of Science:

  • Optoelectronics
  • Fiber Optics Sensing
  • Interferometry

Background:

  • Accurate measurement of refractive index (RI) is crucial in various scientific and industrial applications.
  • Environmental factors like temperature and axial strain can interfere with RI measurements, necessitating compensation strategies.
  • Mach-Zehnder interferometers (MZIs) offer high sensitivity but require robust designs for practical sensing.

Purpose of the Study:

  • To propose and demonstrate a novel fiber-optic refractometer capable of simultaneous measurement of refractive index, temperature, and axial strain.
  • To achieve temperature- and axial strain-compensated refractive index measurement.
  • To leverage highly sensitive outer-cladding modes in a tapered bend-insensitive fiber based MZI.

Main Methods:

  • Utilizing a tapered bend-insensitive fiber to construct a Mach-Zehnder interferometer.
  • Employing highly sensitive outer-cladding modes for sensing.
  • Calibrating peak wavelength shifts to form a wavelength-related character matrix (λ)M(RI,T,ε).
  • Acquiring a phase-related character matrix (Φ)M(RI,T,ε) through direct determination of phase shifts.

Main Results:

  • Demonstration of a fiber-optic refractometer with simultaneous multi-variable sensing capabilities.
  • Successful compensation for temperature and axial strain effects on refractive index measurements.
  • Development of wavelength- and phase-related characterization matrices for comprehensive environmental sensing.

Conclusions:

  • The proposed fiber-optic refractometer effectively measures refractive index while compensating for temperature and axial strain.
  • The use of outer-cladding modes in a tapered bend-insensitive fiber MZI provides a sensitive platform for simultaneous environmental sensing.
  • The developed characterization matrices enable accurate and simultaneous determination of multiple variables (RI, T, ε).