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Related Concept Videos

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...
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Measurements of Strain01:27

Measurements of Strain

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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...
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Related Experiment Video

Updated: Dec 9, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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White-light-driven resonant fiber-optic strain sensor.

Shuangxiang Zhao, Qingwen Liu, Zuyuan He

    Optics Letters
    |September 15, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A novel white-light-driven resonant fiber-optic sensor (FOS) achieves high strain resolution without expensive lasers. This breakthrough paves the way for more accessible and commercializable FOS technology.

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    Area of Science:

    • Photonics and Sensor Technology
    • Optical Metrology
    • Fiber Optic Sensing

    Background:

    • Laser-driven resonant fiber-optic sensors (FOSs) approach ultimate thermal noise limits but require expensive, narrow-linewidth lasers, hindering commercialization.
    • Existing FOS technologies face limitations due to specialized laser requirements and cost.

    Purpose of the Study:

    • To propose and demonstrate a novel white-light-driven resonant FOS.
    • To overcome the commercialization barriers associated with expensive laser sources in FOS.

    Main Methods:

    • Utilizing white-light multi-beam interferometry to obtain resonant peaks from a fiber Fabry-Perot interferometer sensor.
    • Employing the Pound-Drever-Hall technique for tracking resonance drifts for sensor readout.
    • Applying the developed FOS for precise strain measurement.

    Main Results:

    • Successfully demonstrated a white-light-driven resonant FOS.
    • Achieved a strain resolution of 0.9 microstrain per root Hertz (µε/√Hz) at 100 Hz.
    • The performance is comparable to that of traditional laser-driven FOSs.

    Conclusions:

    • The proposed white-light-driven resonant FOS offers a cost-effective alternative to laser-driven systems.
    • This technology has the potential to significantly advance the commercial viability of high-resolution fiber optic sensing.
    • The achieved strain resolution validates the effectiveness of white-light interferometry and Pound-Drever-Hall technique in resonant FOS.