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Related Concept Videos

Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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...
Measurements of Strain01:27

Measurements of Strain

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 gauge...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
Shearing Strain01:20

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...

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Related Experiment Video

Updated: Jun 6, 2026

Production of a Strain-Measuring Device with an Improved 3D Printer
06:17

Production of a Strain-Measuring Device with an Improved 3D Printer

Published on: January 30, 2020

Phase-based Bragg intragrating distributed strain sensor.

S Huang, M M Ohn, R M Measures

    Applied Optics
    |November 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel fiber-optic Bragg grating (FBG) sensing method. It measures phase spectrum to precisely map strain distribution in smart structures.

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    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

    Published on: September 30, 2019

    Related Experiment Videos

    Last Updated: Jun 6, 2026

    Production of a Strain-Measuring Device with an Improved 3D Printer
    06:17

    Production of a Strain-Measuring Device with an Improved 3D Printer

    Published on: January 30, 2020

    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
    08:23

    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

    Published on: September 30, 2019

    Area of Science:

    • Optoelectronics
    • Materials Science
    • Structural Health Monitoring

    Background:

    • Fiber-optic Bragg gratings (FBGs) are widely used in sensing applications.
    • Strain gradients in FBGs cause chirping, leading to wavelength variations along the grating.
    • Understanding local strain is crucial for smart structure integrity.

    Purpose of the Study:

    • To develop and describe a new strain-distribution sensing technique using FBGs.
    • To enable precise measurement of strain gradients within smart structures.
    • To enhance the characterization of structural behavior at millimeter to centimeter scales.

    Main Methods:

    • Utilizing the phase spectrum of reflected light from a fiber-optic Bragg grating.
    • Measuring wavelength-dependent penetration depth caused by strain gradients.
    • Correlating group delay and resonant wavelength with local strain distribution.
    • Analyzing the phase spectrum to determine strain as a function of location.

    Main Results:

    • Demonstrated a phase-based technique for strain distribution sensing.
    • Successfully mapped local strain variations along the length of a chirped FBG.
    • Validated the relationship between phase spectrum, group delay, and strain gradients.
    • Achieved strain measurement capabilities at millimeter and centimeter resolutions.

    Conclusions:

    • The developed phase-based FBG sensing technique provides a novel method for strain distribution analysis.
    • This technique offers enhanced capabilities for studying strain effects in smart structures.
    • The method allows for precise, localized strain measurements crucial for structural health monitoring.