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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...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Transformation of Plane Strain01:12

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...

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Related Experiment Video

Updated: Jun 16, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
06:56

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Published on: May 23, 2017

Practical speckle interferometry for measuring in-plane deformation.

G Cloud

    Applied Optics
    |February 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Speckle interferometry uses coherent light to capture double-exposure images, revealing object changes like displacement through observed fringes. This technique allows for variable measurement sensitivity, demonstrated here for in-plane displacements in deformable solids.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Mechanical Engineering

    Background:

    • Speckle interferometry is an optical measurement technique.
    • It utilizes coherent light illumination and double-exposure photography.
    • Changes in an object between exposures create observable fringe patterns.

    Purpose of the Study:

    • To describe a simple calibration procedure for speckle interferometry.
    • To demonstrate its application in measuring in-plane displacements in deformable solids.
    • To identify limitations of the technique with specific equipment.

    Main Methods:

    • High-resolution double-exposure photography of an object illuminated with coherent light.
    • Observation of fringe patterns using a Fourier optical data processor.
    • Application of a simple calibration procedure for displacement measurement.

    Main Results:

    • Fringe patterns indicative of object displacements were observed.
    • The technique was successfully demonstrated for measuring in-plane displacements in deformable solids.
    • Variable measurement sensitivity was achievable after data recording.

    Conclusions:

    • Speckle interferometry provides a method for measuring displacements in deformable solids.
    • The described calibration procedure is effective for this application.
    • Limitations exist regarding sensitivity range with holographic films, simple procedures, and small lasers.