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Proceedings Paper

Infrared images of shock-heated tin
Author(s): Craig W. McCluskey; Mark D. Wilke; William D. Turley; Gerald D. Stevens; Lynn R. Veeser; Michael Grover; Arnold Adams
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Paper Abstract

High-resolution, gated infrared images were taken of tin samples shock heated to just below the 505 K melting point. Sample surfaces were either polished or diamond-turned, with grain sizes ranging from about 0.05 to 10 mm. A high explosive in contact with a 2-mm-thick tin sample induced a peak sample stress of 18 GPa. Interferometer data from similarly-driven tin shots indicate that immediately after shock breakout the samples spall near the free (imaged) surface with a scab thickness of about 0.1 mm. Images were taken with gate widths of 0.2 to 0.5 μs and start times ranging from 0.3 to 1.5 μs after shock breakout. The camera and experimental techniques were described previously. [S.S. Lutz, et al., Gated IR images of shocked surfaces, in Shock Compression of Condensed Matter-2001, M.D. Furnish, ed., AIP (2002)]. Infrared radiation (3 to 5 μm) from the sample was imaged onto a gated InSb camera array with lens systems capable of resolving features on the order of 0.1 mm. Assuming a dynamic emissivity of 0.1, calculated temperatures were around 700 K for the millimeter-sized hot spots and 450 K in the surrounding area. The images showed different amounts and physical distribution of hot spots. Although there was a trend to more and higher-temperature hot spots with larger grain size, the hot spots do not appear to map directly to individual gain shapes or boundaries.

Paper Details

Date Published: 17 March 2005
PDF: 11 pages
Proc. SPIE 5580, 26th International Congress on High-Speed Photography and Photonics, (17 March 2005); doi: 10.1117/12.585558
Show Author Affiliations
Craig W. McCluskey, Los Alamos National Lab. (United States)
Mark D. Wilke, Los Alamos National Lab. (United States)
William D. Turley, Bechtel Nevada (United States)
Gerald D. Stevens, Bechtel Nevada (United States)
Lynn R. Veeser, Bechtel Nevada (United States)
Michael Grover, Bechtel Nevada (United States)
Arnold Adams, Santa Barbara Focalplane (United States)

Published in SPIE Proceedings Vol. 5580:
26th International Congress on High-Speed Photography and Photonics
Dennis L. Paisley; Stuart Kleinfelder; Donald R. Snyder; Brian J. Thompson, Editor(s)

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