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

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Published on: November 7, 2016

Quasi-distributed long-gauge fiber optic sensor system.

Matjaz Linec1, Denis Donlagić

  • 1University of Maribor, Laboratory for Electro-optics and Sensor Systems, Smetanova ul 17, 2000 Maribor, Slovenia. matjaz.linec@uni-mb.si

Optics Express
|July 8, 2009
PubMed
Summary

A novel quasi-distributed fiber optic sensor system measures optical path length variations for strain and temperature sensing. It achieves high resolution using standard components, offering a cost-effective solution.

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Area of Science:

  • Fiber Optic Sensing
  • Optical Metrology
  • Instrumentation Systems

Background:

  • Optical path length variation measurement is crucial for strain and temperature sensing.
  • Existing systems may lack the resolution or cost-effectiveness for long-gauge applications.

Purpose of the Study:

  • To present a quasi-distributed, long-gauge fiber optic sensor system.
  • To demonstrate its capability for precise optical path length variation measurement.
  • To enable microstrain resolution for strain and temperature sensing.

Main Methods:

  • Utilizing a sensing fiber divided into segments by semi-reflective mirrors.
  • Launching radio-frequency modulated optical bursts and measuring phase differences of reflected bursts.
  • Employing standard telecommunication PIN diodes and Fabry-Perot laser diodes for signal processing.

Main Results:

  • Successfully addressed twenty sensing fiber segments with a single processor.
  • Achieved a resolution of fiber length variation better than 5 micrometers.
  • Demonstrated potential for microstrain resolution due to long sensing fiber sections.
  • Reported system drift below 20 micrometers/°C, primarily due to electronic components.

Conclusions:

  • The proposed system offers a cost-effective, quasi-distributed solution for long-gauge strain and temperature sensing.
  • High resolution and stability are achievable using readily available, low-cost components.
  • This technology has direct applications in structural health monitoring and precision measurement.