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Laser Speckle Pattern Stability in Hypersonic Regimes for Experimental Mechanics and Metrological Studies

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Abstract

An empirical study assessing the suitability of laser speckle patterns for use in experimental mechanics research conducted at hypersonic conditions is presented. Speckle patterns generated via coherent optical scattering from a gold-coated graphite surface inserted into a Mach 10 air stream were collected and analyzed using Computer-Aided Speckle Interferometry using two methodologies: a typical spanwise approach involving increasing temporal span between image pairs, and a sequential approach that utilizes a combination of temporal re-referencing and spatial resampling. Results were characterized for spatial-temporal stability and variance. Our observations demonstrate that optical methods relying on stable and properly formed speckle patterns can be used in a hypersonic regime at various Reynolds numbers and common camera frame rates, but the technique is sensitive to the conditions of the airflow and the processing methodology chosen.

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Acknowledgements

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 and was supported by the LLNL-LDRD Program under Project No. 21-SI-003. The authors would like to thank Rich Shuttlesworth for his help with preliminary measurements, test preparations, and helpful discussions. The test facility was funded by the Aeronautics Evaluation and Test Capabilities (AETC) and the Hypersonic Technology Project (HTP) of the National Air and Space Administration, Langley Research Center. The authors would like to thank our test engineers and staff, Sheila Wright, Joshua Weisberger, Brett Bathel, Kevin Hollingsworth, Anthony Robbins, Jonathan Crider, Paul Tucker, and Donald Day for their assistance with wind tunnel testing. The authors would also like to thank Paul Danehy and Neil Rodrigues for supporting laser setup and safety permits, Mark Kulick for help with hardware fabrication, and William Ripley for designing and setting up the optomechanical supports.

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, Livermore, California, 94550, USA

    L. T. Keene, J. S. Lum, E. Busby, A. C. Rousso, B. M. Goldberg & J. S. Stolken

  2. NASA Langley Research Center, Hampton, Virginia, 23681, USA

    G. M. Buck

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  1. L. T. Keene
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Correspondence to L. T. Keene.

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Keene, L.T., Lum, J.S., Busby, E. et al. Laser Speckle Pattern Stability in Hypersonic Regimes for Experimental Mechanics and Metrological Studies. Exp Tech 48, 101–113 (2024). https://doi.org/10.1007/s40799-023-00648-y

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