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

Young J Song1, Kara J Peters

  • 1Department of Mechanical and Aerospace Engineering, North Carolina State University, Campus Box 7910, Raleigh, North Carolina 27695, USA.

Applied Optics
|October 4, 2012
PubMed
Summary
This summary is machine-generated.

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This study presents a self-writing polymer waveguide strain sensor with self-repair capabilities, enabling measurements up to 150% tensile strain. The hybrid sensor design ensures high fringe visibility and linear strain response, simplifying calibration.

Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Optical fiber sensors offer remote and precise measurement capabilities.
  • Fabry-Perot interferometers are sensitive to external perturbations like strain.
  • Developing robust and self-healing sensors is crucial for long-term structural health monitoring.

Purpose of the Study:

  • To demonstrate a novel polymer waveguide Fabry-Perot interferometer strain sensor fabricated using a self-writing technique.
  • To investigate the sensor's self-repair mechanism and its impact on strain measurement range and accuracy.
  • To evaluate a hybrid sensor design combining multimode and single-mode optical fibers for enhanced performance.

Main Methods:

  • Fabrication of a polymer waveguide Fabry-Perot sensor via a self-writing process in a photopolymerizable resin bath between two silica optical fibers.

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  • Utilizing ultraviolet (UV) light for sensor fabrication and repair, and near-infrared (NIR) light for interrogation.
  • Constructing a hybrid sensor by splicing a multimode optical fiber segment to a single-mode optical fiber input.

    • Main Results:

    • Demonstrated strain measurements up to 150% applied tensile strain, extended by sensor self-repair.
    • Achieved a highly linear peak frequency shift with applied strain for the hybrid sensor (sensitivity of 2.3×10(-3) nm/% strain).
    • Observed consistent calibration between original, repaired, and multiple sensor fabrications, with no decrease in fringe visibility.

    Conclusions:

    • The self-writing polymer waveguide Fabry-Perot sensor offers a robust and self-repairing solution for high-strain measurements.
    • The hybrid sensor design enhances waveguide quality and fringe visibility, leading to reliable and linear strain sensing.
    • The sensor's self-repair capability and consistent calibration simplify practical implementation in structural monitoring applications.