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Blast Quantification Using Hopkinson Pressure Bars
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Megahertz-rate background-oriented schlieren tomography in post-detonation blasts.

Mateo Gomez, Samuel J Grauer, Josh Ludwigsen

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    |April 26, 2022
    PubMed
    Summary

    This study introduces a new method for visualizing explosive blasts, providing high-resolution 3D density fields without symmetry assumptions. This technique enhances predictive modeling of complex shock structures in blast diagnostics.

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    Area of Science:

    • Fluid Dynamics
    • Combustion Science
    • Optical Diagnostics

    Background:

    • Accurate modeling of explosive blasts requires high spatiotemporal resolution diagnostics.
    • Existing methods often rely on simplified, spherically symmetric models and point measurements.
    • Practical explosive charges exhibit complex, multidimensional structures and shock-flow interactions.

    Purpose of the Study:

    • To develop and demonstrate a novel diagnostic technique for resolving transient, 3D density fields in explosive blasts.
    • To overcome limitations of symmetry assumptions in current blast diagnostics.
    • To enable quantitative reconstruction of complex shock structures.

    Main Methods:

    • Megahertz-rate background-oriented schlieren tomography was employed.
    • A numerical evaluation quantified error sources and optimized reconstruction parameters.
    • Experimental validation was performed on commercial blast charges with varying structures.

    Main Results:

    • The method achieved megahertz temporal resolution and quantitative 3D reconstruction without symmetry constraints.
    • Numerical simulations showed average errors of ~3% in synthetic environments.
    • Experimental reconstructions of primary blast fronts were within 9% of expected peak values.

    Conclusions:

    • Megahertz-rate background-oriented schlieren tomography successfully visualizes complex, multi-shock structures in explosive blasts.
    • The technique offers a relatively simple setup using a single high-speed camera and light source.
    • This advancement improves the accuracy and applicability of blast diagnostics for predictive modeling.