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Related Experiment Video

Updated: Feb 25, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Strain Wave Acquisition by a Fiber Optic Coherent Sensor for Impact Monitoring.

Claudio Sbarufatti1, Alessio Beligni2, Andrea Gilioli3

  • 1Dipartimento di Meccanica, Politecnico di Milano, Milano 20156, Italy. claudio.sbarufatti@polimi.it.

Materials (Basel, Switzerland)
|August 5, 2017
PubMed
Summary

A new fiber optic coherent sensor offers advanced structural health monitoring. This technology accurately detects strain waves for both passive impact identification and active Lamb wave monitoring in real-time.

Keywords:
Lamb wavecoherent detectionfinite element modelimpact force reconstructioninterferometric fiber optic sensorsmodelling

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Area of Science:

  • Engineering
  • Materials Science
  • Physics

Background:

  • Structural health monitoring (SHM) requires precise detection of high-frequency dynamics.
  • Existing methods for strain wave analysis face limitations in sensitivity and specificity.
  • Fiber optic sensing offers a promising avenue for non-destructive evaluation.

Purpose of the Study:

  • To introduce a novel fiber optic sensing technology for high-frequency dynamics detection.
  • To apply this technology for both passive impact identification and active Lamb wave monitoring in SHM.
  • To validate the performance of the proposed sensing solution against established methods.

Main Methods:

  • Development of a fiber optic-based interferometric architecture with a coherent detection scheme.
  • Flexible arrangement of sensing fiber (e.g., multiple loops or longer gauge length) for tailored sensitivity.
  • Detection of strain waves using the fiber optic coherent (FOC) sensor, triggered by piezoelectric transducers or impulse hammers.
  • Comparison of FOC sensor measurements with Finite Element (FE) numerical models and traditional piezoelectric sensors.

Main Results:

  • The FOC sensor successfully retrieves high-frequency phase information passively.
  • Different fiber arrangements demonstrated enhanced sensitivity for specific SHM applications.
  • Experimental results showed good agreement with FE models and piezoelectric sensors for both active and passive monitoring.
  • The technology proved effective in detecting strain waves generated by various sources.

Conclusions:

  • The proposed fiber optic coherent sensing technology is a viable and effective solution for high-frequency dynamics detection in SHM.
  • The system offers flexibility in sensor configuration to meet diverse application requirements.
  • The FOC sensor provides reliable performance comparable to existing methods, with potential for improved sensitivity and passive operation.