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Strain Transfer in Surface-Bonded Optical Fiber Sensors.

Francesco Falcetelli1, Leonardo Rossi2, Raffaella Di Sante1

  • 1Department of Industrial Engineering-DIN, University of Bologna, 47121 Forli, Italy.

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Summary

A new model predicts strain transfer in fiber optic sensors, accounting for complex cable structures. Unlike previous models, it shows strain doesn't drop to zero at bonding ends, improving structural monitoring accuracy.

Keywords:
distributed sensingfiber optic sensorsoptical fiber cablesstrain transfer

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Area of Science:

  • Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Fiber optic sensors are crucial for structural health monitoring.
  • Accurate strain transfer prediction in sensor coatings is a key challenge.
  • Existing analytical models often assume zero strain at bonding ends, which is unrealistic.

Purpose of the Study:

  • To develop a novel analytical model for strain transfer in multilayered, surface-bonded fiber optic sensing cables.
  • To address the limitations of existing models that assume null strain at bonding extremities.
  • To provide a more accurate prediction of strain profiles in complex sensing cable configurations.

Main Methods:

  • Development of a novel analytical model for strain transfer in multilayered sensing cables.
  • Experimental validation using two surface-mounted cable prototypes.
  • Numerical validation of the analytical model.
  • Testing across three different bonding lengths and five distinct load cases.

Main Results:

  • The developed model accurately predicts the strain profile along the fiber optic sensor.
  • Demonstrated that strain values at the extremities of the bonded fiber length are non-null.
  • Validated the model's effectiveness against experimental and numerical data.

Conclusions:

  • The novel strain transfer model offers improved accuracy for surface-bonded sensing cables.
  • The model's ability to account for non-null end strains enhances structural monitoring reliability.
  • This advancement is critical for precise analysis of engineering structures using fiber optic sensing technology.