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Related Concept Videos

Shrinkage in Concrete01:27

Shrinkage in Concrete

64
Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
64
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  3. Research Domains
  5. Engineering
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  9. Wearable Materials
  11. Challenges Of Embedding Fiber Bragg Grating Sensors In Castable Material: Influence Of Material Shrinkage And Fiber Coatings On Ultrasonic Measurements.
  1. Home
  3. Research Domains
  5. Engineering
  7. Materials Engineering
  9. Wearable Materials
  11. Challenges Of Embedding Fiber Bragg Grating Sensors In Castable Material: Influence Of Material Shrinkage And Fiber Coatings On Ultrasonic Measurements.

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Challenges of Embedding Fiber Bragg Grating Sensors in Castable Material: Influence of Material Shrinkage and Fiber Coatings on Ultrasonic Measurements.

Nicolas Derrien1, Maximilien Lehujeur1, Xavier Chapeleau2

  • 1Géophysique et Evaluation Non Destructive (GéoEND) Laboratory, Géotechnique, Environnement, Risques Naturels et Sciences de la Terre (GERS) Department, Université Gustave Eiffel, Nantes Campus, F-44344 Bouguenais, France.

Sensors (Basel, Switzerland)
|May 14, 2025

View abstract on PubMed

Summary
This summary is machine-generated.
Keywords:
acrylate coatingbulk wavesoptical fiberspolyimide coating

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Fiber Bragg gratings (FBGs) can be integrated into polyurethane resins for ultrasonic sensing. FBGs show sensitivity to ultrasonic waves, with wavelength shifts up to 10 nm during resin polymerization, requiring careful system calibration.

Area of Science:

  • Materials Science
  • Sensor Technology
  • Acoustics

Background:

  • Fiber optic sensors, particularly Fiber Bragg Gratings (FBGs), are valuable for measuring dynamic strain fields from mechanical waves.
  • Their non-intrusive nature when embedded makes them ideal for diverse structural health monitoring applications.

Purpose of the Study:

  • To investigate the feasibility of integrating FBGs into castable polyurethane resins for ultrasonic wave sensing.
  • To analyze the impact of resin polymerization and hardening on FBG spectral properties.
  • To assess FBG sensitivity to ultrasonic waves and the influence of fiber coatings on energy transfer.

Main Methods:

  • Integration of FBGs into castable polyurethane resins.
  • Analysis of 1D strain profiles and central wavelength shifts during resin polymerization.
polyurethane resins
ultrasonics
  • Assessment of FBG sensitivity to 100 kHz ultrasonic waves post-polymerization.
  • Evaluation of energy transfer influenced by acrylate and polyimide fiber coatings.

    • Main Results:

    • Resin polymerization caused central wavelength shifts in FBG spectra up to 10 nm, necessitating consideration for interrogation system compatibility.
    • Exploitable ultrasonic waves were detected propagating within the resin samples.
    • Fiber coatings (acrylate and polyimide) exhibited similar energy transfer rates in dynamic strain fields.

    Conclusions:

    • FBGs show potential for use as embedded ultrasonic wave sensors in castable materials like polyurethane resins.
    • The observed wavelength shifts during polymerization must be accounted for in practical FBG sensor applications.
    • Further investigation into potential crosstalk effects between FBGs is warranted.