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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
Atomic Force Microscopy01:08

Atomic Force Microscopy

3.6K
Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
3.6K
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

4.2K
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
4.2K
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

311
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...
311
Shearing Strain01:20

Shearing Strain

684
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...
684
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

589
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: Oct 2, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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U-shape core-offset fiber sensor with submicrostrain resolution over a 35 millistrain range.

Huibo Fan, Hongwei Fan, Cong Lu

    Applied Optics
    |February 24, 2022
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    Summary
    This summary is machine-generated.

    This study introduces a novel U-shape fiber sensor capable of measuring large strains (over 35 mɛ) with high accuracy. This breakthrough is crucial for structural monitoring applications requiring precise steel strain detection.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Structural Health Monitoring

    Background:

    • Fiber optic sensors are vital for structural monitoring, but traditional sensors have limited strain detection ranges (<1%).
    • Existing technologies struggle to meet the demands for high-resolution, large-strain measurement in steel structures.

    Purpose of the Study:

    • To develop a novel fiber optic sensor for large strain measurement with sub-micro resolution.
    • To overcome the limitations of conventional fiber sensors in terms of strain range and accuracy.

    Main Methods:

    • A U-shape core-offset fiber sensor was designed and fabricated using four fiber segments with slight length differences.
    • The sensor utilizes the interference of reflected high-order modes at silica/air interfaces to enable strain detection.
    • The hybrid air-glass structure facilitates large transverse bending for compression and tension measurements.

    Main Results:

    • The proposed sensor achieves a large strain detection range exceeding 35 mɛ.
    • High strain sensitivity of 20.75 pm/µɛ and accuracy of 0.5 µɛ were demonstrated.
    • Simultaneous measurement of compression and tension strain was successfully achieved.

    Conclusions:

    • The novel U-shape core-offset fiber sensor offers a significant advancement for large strain measurement.
    • The sensor's high sensitivity, large range, and ease of fabrication make it suitable for practical structural monitoring applications.
    • This technology addresses the critical need for accurate, wide-range strain sensing in demanding environments.