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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.8K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.8K

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Localized strain sensing with fiber Bragg-grating ring cavities.

C E Campanella, A Giorgini, S Avino

    Optics Express
    |February 12, 2014
    PubMed
    Summary

    We demonstrate a novel fiber loop optical resonator using a Fiber Bragg Grating (FBG). This FBG resonator enables precise, localized strain sensing by analyzing mode splitting, improving fiber-optic sensor performance.

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    Area of Science:

    • Photonics and Optical Engineering
    • Fiber Optic Sensing
    • Resonant Cavity Optics

    Background:

    • Conventional ring resonators lack localized sensing capabilities.
    • Fiber Bragg Gratings (FBGs) are versatile components in optical systems.
    • Understanding mode degeneracy in optical resonators is crucial for sensing applications.

    Purpose of the Study:

    • To theoretically describe and experimentally demonstrate a novel optical resonator using an FBG in a fiber loop.
    • To investigate the spectral characteristics and mode splitting behavior of the FBG resonator.
    • To showcase the application of this resonator for localized strain sensing.

    Main Methods:

    • Theoretical modeling of an optical resonator incorporating an FBG within a closed fiber loop.
    • Experimental setup to realize and characterize the FBG-based ring resonator.
    • Analysis of spectral splitting in response to variations in FBG physical parameters, including applied strain.

    Main Results:

    • The FBG resonator exhibits a split-mode structure when FBG reflectivity is significant, unlike conventional ring resonators.
    • The magnitude of mode splitting is directly correlated with changes in FBG physical parameters.
    • The system demonstrates high sensitivity to localized strain applied to the FBG, with minimal sensitivity to strain elsewhere in the loop.

    Conclusions:

    • The FBG-based fiber loop resonator offers a unique platform for cavity-enhanced, localized measurements.
    • This configuration provides improved strain sensing with reduced sensitivity to environmental perturbations.
    • The findings represent a significant advancement for fiber-optic sensor technology.