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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

789
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...
789

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Updated: Jul 1, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Sensitivity-enhanced strain sensor based on a shape-modulated multimode fiber.

Zhiyuan Zhao, Xinruo Li, Shihao Yan

    Optics Letters
    |March 1, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel strain sensor using a shape-modulated multimode fiber (MMF). This new design significantly enhances strain sensitivity, offering a 33-fold improvement over conventional fiber optic sensors for precise strain measurement.

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    Area of Science:

    • Optical Fiber Sensing
    • Photonics
    • Materials Science

    Background:

    • Conventional single-mode-multimode-single-mode (SMS) fiber structures utilize a homogeneous multimode fiber (MMF) section.
    • Existing SMS fiber sensors exhibit limited strain sensitivity, restricting their application in high-precision measurements.
    • The mechanical strain in cylindrical MMFs can be a limiting factor for sensor performance.

    Purpose of the Study:

    • To demonstrate a sensitivity-enhanced strain sensor utilizing a shape-modulated multimode fiber (MMF).
    • To investigate the effect of shape modulation on the mechanical strain and sensitivity of SMS fiber structures.
    • To achieve a significant improvement in strain sensitivity compared to conventional cylindrical MMF-based sensors.

    Main Methods:

    • Fabrication of a novel SMS fiber structure incorporating a shape-modulated MMF section.
    • The shape modulation was achieved through lateral offset splicing of multiple MMF segments.
    • Simulation and experimental analysis were conducted to evaluate mechanical strain and strain sensitivity.

    Main Results:

    • Simulation results indicated that the shape-modulated MMF exhibits higher peak mechanical strain than a cylindrical MMF.
    • Experimental results demonstrated a strain sensitivity of -55.63 pm/µε for the shape-modulated MMF SMS sensor.
    • This sensitivity represents a 33-fold enhancement compared to the -1.65 pm/µε sensitivity of conventional cylindrical MMF SMS sensors.

    Conclusions:

    • The shape-modulated MMF SMS fiber sensor offers significantly enhanced strain sensitivity.
    • The proposed sensor design is cost-effective and suitable for precise strain measurement applications.
    • This technology holds potential for advancements in structural health monitoring and other precision sensing fields.