Abstract

Given the need for a simple and fieldable diagnostic that can enable the study of ultrahigh-speed phenomena in three dimensions, this work presents experiments and simulations to optimize and demonstrate a digital in-line holography system with an acquisition rate of 1 million frames per second. The system is used to study the collision of a supersonic projectile and its bow shock with 1 mm diameter water droplets. The holograms acquired are three-dimensionally reconstructed and de-twinned to analyze shock wave phenomena in these supersonic impact events and demonstrate the potential of ultrahigh-speed digital holography as a robust technique to probe complex shock wave dynamics and droplet breakup.

© 2021 Optical Society of America

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Supplementary Material (2)

NameDescription
» Visualization 1       Reconstructions for a duration of 128 µs at 195.8 mm (left), 201.1 mm (center) and 205.7 mm (right) from the convex lens focal point.
» Visualization 2       Depth scan of the complex shock wave shape formed at t = 7 µs following the impact of two closely spaced droplets with a supersonic projectile in Fig. 14.

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