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Multiple light scattering in metallic ejecta produced under intense shockwave compression

Article dans une revue avec comité de lecture
Author
FRANZKOWIAK, Jean Eloi
119523 DAM Île-de-France [DAM/DIF]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
MERCIER, P
119523 DAM Île-de-France [DAM/DIF]
PRUDHOMME, G.
706 Laboratoire sols, solides, structures - risques [Grenoble] [3SR]
119523 DAM Île-de-France [DAM/DIF]
300016 Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
BERTHE, Laurent
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/15439
DOI
10.1364/AO.57.002766
Date
2018
Journal
Applied optics

Abstract

A roughened metallic plate, subjected to intense shock wave compression, gives rise to an expanding ejecta particle cloud. Photonic Doppler velocimetry (PDV), a fiber-based heterodyne velocimeter, is often used to track ejecta velocities in dynamic compression experiments and on nanosecond time scales. Shortly after shock breakout at the metal–vacuum interface, a particular feature observed in many experiments in the velocity spectrograms is what appear to be slow-moving ejecta, below the free-surface velocity. Using Doppler Monte Carlo simulations incorporating the transport of polarization in the ejecta, we show that this feature is likely to be explained by the multiple scattering of light, rather than by possible collisions among particles, slowing down the ejecta. As the cloud expands in a vacuum, the contribution of multiple scattering decreases due to the limited field of view of the pigtailed collimator used to probe the ejecta, showing that the whole geometry of the system must be taken into account in the calculations to interpret and predict PDV measurements. © 2018 Optical Society of America.

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