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Digital Projection Speckle Technique for Fringe Generation

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Advancements in Optical Methods & Digital Image Correlation in Experimental Mechanics, Volume 3

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Abstract

Shadow moiré technique has been a widely utilized method in industry to determine surface flatness, out-of-plane displacement, and 3D metrology. In this paper, we present a digitized speckle method analogous to the shadow moiré method. A randomly generated speckle pattern is first projected onto a screen and digitally recorded. The same pattern is projected onto a specimen and digitally recorded as well. The two images are then converted into TIFF files to be superimposed and processed using a Fourier transform based algorithm to generate fringes that are similar to shadow moiré fringes. Additionally, a Digital Image Correlation (DIC) software was used to generate fringes that are similar to shadow moiré fringes. The technique is simple and straightforward. We apply the technique to a variety of specimens to demonstrate its applicability.

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References

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Acknowledgments

We gratefully acknowledge the support of Dr. Rajapakse, and the financial support of the Office of Naval Research through award no. -N00014-17-1-2873.

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Authors and Affiliations

  1. Department of Mechanical Engineering, College of Engineering and Applied Sciences, State University of New York at Stony Brook, Stony Brook, NY, USA

    Austin Giordano, Andrew Nwuba & Fu-Pen Chiang

Authors
  1. Austin Giordano
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  2. Andrew Nwuba
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  3. Fu-Pen Chiang
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Corresponding author

Correspondence to Austin Giordano .

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Editors and Affiliations

  1. Graduate Institute of Precision Engineering, National Chung Hsing University, Taichung, Taiwan

    Ming-Tzer Lin

  2. Illinois Institute of Technology, Chicago, IL, USA

    Cesar Sciammarella

  3. Mechanical Engineering, Northwestern University, Evanston, IL, USA

    Horacio D. Espinosa

  4. WPI-ME/CHSLT, Worcester Polytechnic Institute, Worcester, MA, USA

    Cosme Furlong

  5. Politecnico di Bari, Bari, Italy

    Luciano Lamberti

  6. Sandia National Laboratories, Albuquerque, NM, USA

    Phillip Reu

  7. Department of Mechanical Engineering, University of South Carolina, Columbia, SC, USA

    Michael Sutton

  8. Taiwan Instrument Technology Institute, NARLabs, Hsinchu, Taiwan

    Chi-Hung Hwang

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© 2020 Society for Experimental Mechanics, Inc.

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Giordano, A., Nwuba, A., Chiang, FP. (2020). Digital Projection Speckle Technique for Fringe Generation. In: Lin, MT., et al. Advancements in Optical Methods & Digital Image Correlation in Experimental Mechanics, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-30009-8_1

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  • DOI: https://doi.org/10.1007/978-3-030-30009-8_1

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-30008-1

  • Online ISBN: 978-3-030-30009-8

  • eBook Packages: EngineeringEngineering (R0)

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