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

Design Example: Strain Gauge Bridge or Wheatstone Bridge

1.3K
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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Updated: Apr 19, 2026

Production of a Strain-Measuring Device with an Improved 3D Printer
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Split-mode fiber Bragg grating sensor for high-resolution static strain measurements.

P Malara, L Mastronardi, C E Campanella

    Optics Letters
    |December 16, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a highly sensitive fiber optic strain sensor using a π phase-shifted fiber Bragg grating. It achieves unprecedented resolution for detecting minute mechanical deformations, advancing fiber Bragg grating sensor technology.

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    Area of Science:

    • Photonics and Optical Sensing
    • Materials Science and Engineering
    • Mechanical Engineering

    Background:

    • Fiber Bragg gratings (FBGs) are widely used in sensing applications.
    • Existing FBG sensors have limitations in sensitivity and resolution for static and low-frequency strain detection.
    • Fiber ring cavities offer potential for enhanced sensing performance.

    Purpose of the Study:

    • To develop a novel fiber optic strain sensor with ultra-high sensitivity in the static and low-frequency regime.
    • To leverage the unique properties of a π phase-shifted fiber Bragg grating within a fiber ring cavity.
    • To demonstrate a new benchmark in strain resolution for FBG-based sensors.

    Main Methods:

    • Fabrication of a fiber ring cavity incorporating a π phase-shifted fiber Bragg grating.
    • Utilizing the grating as a partial reflector to couple counter-propagating cavity modes, inducing resonant frequency splitting.
    • Employing a locked-carrier scanning-sideband technique to interrogate cavity resonance and track frequency splitting variations.
    • Characterizing the sensor's measurable strain range and bandwidth.

    Main Results:

    • Demonstrated a strain sensor with very high sensitivity in the static and low-frequency regime.
    • Achieved a record resolution of 320 pε/√Hz at 0 Hz.
    • The frequency splitting proved highly sensitive to length, temperature, and refractive index changes.
    • Real-time tracking of splitting variations due to mechanical deformations was successful.

    Conclusions:

    • The developed fiber ring cavity sensor with a π phase-shifted FBG offers superior strain sensitivity and resolution.
    • This technology represents a significant advancement for fiber Bragg grating strain sensing.
    • The sensor is suitable for applications requiring precise detection of static and low-frequency strain.