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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...
Flexural Stress01:16

Flexural Stress

When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...

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Related Experiment Video

Updated: Jun 9, 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

Interferometric stress birefringence measurement.

E R Cochran, C Ai

    Applied Optics
    |August 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a sensitive, automated method using a phase-measuring Fizeau interferometer to precisely measure stress birefringence in optical windows. The technique quantifies phase differences to calculate material birefringence accurately.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Optical Metrology

    Background:

    • Stress birefringence in optical materials can affect performance.
    • Accurate measurement of stress birefringence is crucial for optical system design.
    • Existing methods may lack sensitivity or automation.

    Purpose of the Study:

    • To develop a sensitive and automated method for measuring stress birefringence in optical windows.
    • To quantify the phase difference between fast and slow axes of a material.
    • To enable precise calculation of stress-induced birefringence.

    Main Methods:

    • Utilized a phase-measuring Fizeau interferometer.
    • Incorporated a variable retarder and a nonpolarizing beam splitter.
    • Employed phase-measurement techniques and a computer-controlled system with a liquid-crystal retarder for automation.

    Main Results:

    • The method accurately measures stress birefringence by analyzing optical path difference (OPD) profiles.
    • Subtracting OPD profiles for different polarization orientations reveals phase differences.
    • Demonstrated a fully automated instrument for birefringence measurement.

    Conclusions:

    • The developed Fizeau interferometer system offers a sensitive and automated approach to stress birefringence measurement.
    • This technique allows for precise characterization of optical window materials.
    • The findings contribute to improved optical component metrology.