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Related Concept Videos

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Related Experiment Video

Updated: Feb 19, 2026

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

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Computer-generated Moiré profilometry.

Chengmeng Li, Yiping Cao, Cheng Chen

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    |November 3, 2017
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    Summary
    This summary is machine-generated.

    A novel 3D measurement technique uses computer-generated moiré fringes for enhanced accuracy and real-time applications. This single-shot method overcomes reflectivity issues, offering a promising advancement in optical metrology.

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    Area of Science:

    • Optical Metrology
    • 3D Measurement Technologies
    • Computer Vision

    Background:

    • Traditional 3D measurement methods can be limited by factors like object reflectivity and require multiple measurements.
    • Fourier Transform Profilometry (FTP) is a common technique but can suffer from spectral overlap and errors.

    Purpose of the Study:

    • To introduce a new 3D measuring method utilizing computer-generated moiré fringes.
    • To enhance the accuracy and real-time capabilities of 3D surface profiling.
    • To address limitations of existing methods, such as object reflectivity dependence and error margins.

    Main Methods:

    • Preparation of two AC components (0-degree and 90-degree phase-shifted) on a reference plane.
    • Multiplication of the single-shot deformed fringe pattern's AC component with the prepared AC components.
    • Retrieval of two computer-generated moiré fringes and calculation of their ratio to determine phase modulation.

    Main Results:

    • Successfully retrieved computer-generated moiré fringes from a single-shot deformed pattern.
    • The ratio of these fringes directly yields the tangent of the phase modulated by the object.
    • Demonstrated smaller error margins compared to Fourier Transform Profilometry due to a higher first-order spectrum.

    Conclusions:

    • The proposed method is feasible and valid for 3D measurements.
    • Its single-shot nature enables real-time and dynamic 3D measurement.
    • The technique effectively mitigates the influence of object reflectivity and offers improved accuracy.