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Related Concept Videos

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...
Stress-Strain Diagram01:10

Stress-Strain Diagram

A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This change in...
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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...
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...
True Stress and True Strain01:28

True Stress and True Strain

Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...

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Related Experiment Video

Updated: Jun 19, 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

In-line fiber étalon for strain measurement.

J S Sirkis, D D Brennan, M A Putman

    Optics Letters
    |October 16, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel fiber interferometer using hollow-core fiber offers robust strain sensing. This new design achieves high dynamic strain resolution, making it suitable for demanding applications.

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    Area of Science:

    • Fiber optics
    • Optical sensing
    • Interferometry

    Background:

    • Existing fiber optic sensors face limitations in mechanical robustness and performance.
    • Intrinsic and extrinsic Fabry-Perot sensors have distinct advantages and disadvantages.
    • A need exists for integrated fiber optic sensors with enhanced stability and sensitivity.

    Purpose of the Study:

    • To present a mechanically robust in-line fiber interferometer.
    • To demonstrate a novel sensor design combining benefits of intrinsic and extrinsic Fabry-Perot sensors.
    • To characterize the strain sensing performance of the developed fiber interferometer.

    Main Methods:

    • Fabrication of a fiber interferometer using a short segment of silica hollow-core fiber.
    • Splicing the hollow-core fiber between two sections of single-mode fiber.
    • Manufacturing hollow-core fiber with an outer diameter matching single-mode lead fibers.
    • Experimental demonstration of dynamic strain measurement.

    Main Results:

    • A mechanically robust in-line fiber optic cavity was successfully created.
    • The sensor design integrates qualities of both intrinsic and extrinsic Fabry-Perot sensors.
    • A dynamic strain resolution of approximately 22 nepsilon/radical Hz was achieved at frequencies above 5 Hz.
    • The sensor demonstrated a gauge length of 137 micrometers.

    Conclusions:

    • The developed fiber interferometer offers a mechanically robust and high-performance solution for strain sensing.
    • This in-line cavity design effectively merges the strengths of different fiber optic sensing approaches.
    • The demonstrated strain resolution indicates potential for advanced sensing applications requiring high sensitivity and stability.