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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.3K
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...
2.3K
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
587

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Updated: Sep 30, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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High sensitivity fiber cladding SPR strain sensor based on V-groove structure.

Yong Wei, Lingling Li, Chunlan Liu

    Optics Express
    |March 18, 2022
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel fiber cladding surface plasmon resonance (SPR) strain sensor using a V-groove structure. This sensor offers high sensitivity for strain detection and is suitable for applications in confined spaces.

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    Area of Science:

    • Photonics and Sensing
    • Optical Fiber Sensors
    • Surface Plasmon Resonance (SPR)

    Background:

    • Coupling light from fiber core to cladding is crucial for fiber-cladding SPR sensors.
    • Existing fiber SPR sensors lack strain-sensing capabilities.
    • V-groove structures offer a potential solution for enhanced light coupling.

    Purpose of the Study:

    • To propose and demonstrate a high-sensitivity fiber cladding SPR strain sensor.
    • To investigate the impact of V-groove parameters on sensor performance.
    • To develop a novel sensor for strain measurement in confined spaces.

    Main Methods:

    • Fabrication of a V-groove on a single-mode fiber using CO2 laser.
    • Coating the cladding with a gold film for SPR excitation.
    • Splicing a multimode fiber to create the sensing probe.
    • Investigating V-groove depth, number, and period effects on refractive index sensing.

    Main Results:

    • Achieved an average refractive index sensitivity of 2896.4 nm/RIU.
    • Demonstrated a high strain wavelength sensitivity of 25.92 pm/µε.
    • Observed a strain light intensity sensitivity of -4.4×10^-4 a.u./µε.
    • The V-groove structure deforms with strain, enabling strain sensing.

    Conclusions:

    • The proposed V-groove based fiber cladding SPR sensor exhibits high sensitivity for strain detection.
    • The sensor design is simple, manufacturable, and suitable for narrow spaces.
    • This technology advances the development of fiber optic strain sensors.