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Ejecta Particle-Size Measurements in Vacuum and Helium Gas using Ultraviolet In-Line Fraunhofer Holography

Technical Report ·
DOI:https://doi.org/10.2172/1136100· OSTI ID:1136100
 [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [3];  [3];  [3];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. National Security Technologies, LLC. (NSTec), Los Alamos, NM (United States)
  3. National Security Technologies, LLC. (NSTec), Santa Barbara, CA (United States)
+ Show Author Affiliations
An Ultraviolet (UV) in-line Fraunhofer holography diagnostic has been developed for making high-resolution spatial measurements of ejecta particles traveling at many mm/μsec. This report will discuss the development of the diagnostic including the high-powered laser system and high-resolution optical relay system. In addition, the system required to reconstruct the images from the hologram and the corresponding analysis of those images to extract particles will also be described. Finally, results from six high-explosive (HE), shock-driven Sn ejecta experiments will be presented. Particle size distributions will be shown that cover most of the ejecta velocities for experiments conducted in a vacuum, and helium gas environments. In addition, a modification has been made to the laser system that produces two laser pulses separated by 6.8 ns. This double-pulsed capability allows a superposition of two holograms to be acquired at two different times, thus allowing ejecta velocities to be measured directly. Results from this double pulsed experiment will be described.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC52-06NA25396
OSTI ID:
1136100
Report Number(s):
LA-UR-14-24722
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
EJECTA
HOLOGRAPHY