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This study introduces a novel phase contrast imaging technique for visualizing melt dynamics in energetic materials. The method uses jetted particles for illumination, enabling detailed observation of multiscale combustion processes.

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Area of Science:

  • Combustion Physics
  • Materials Science
  • Optical Imaging

Background:

  • Powdered energetic materials exhibit complex reaction dynamics across multiple timescales.
  • Visualizing melt phase dynamics is crucial for understanding combustion but challenging with conventional imaging.
  • High self-illumination in energetics often precludes the use of external light sources.

Purpose of the Study:

  • To develop and demonstrate a novel imaging technique for visualizing melt phase dynamics in solid-state reactive systems.
  • To overcome limitations of conventional imaging in studying energetic material combustion.
  • To enable multiphase visualization in multiscale solid-state reactive systems.

Main Methods:

  • Utilized Fourier optics principles with standard imaging components.
  • Employed jetted particles as fast-radiating sources to illuminate slower melt dynamics.
  • Implemented a Fourier filtering scheme with intensity and spatial filtering for contrast enhancement.

Main Results:

  • Successfully visualized multiphase reaction dynamics in powdered energetics.
  • Observed shadowgraphy as the primary mechanism for contrast generation.
  • Identified direction asymmetry in the transfer function, suggesting areas for optical component improvement.

Conclusions:

  • Phase contrast imaging offers a viable method for visualizing melt phase dynamics in energetic material combustion.
  • The developed technique provides a unique solution for multiphase visualization in complex reactive systems.
  • Further optimization with thin lenses could enhance imaging resolution and clarity.