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Proceedings Paper

Optical diagnostics of shaped-charge jets
Author(s): Manfred Held
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Paper Abstract

Maximum penetration is the goal for good shaped charge designs. To achieve this from the jet, built by the liner collapse process, the jet should have the maximum possible tip velocity for the used liner material and should be extremely straight so that the residual jet portions can arrive at the crater bottom, to achieve a low so-called cut-off velocity. For this purpose the use of the flash X-ray techniques is well known. Great deviations can be easily seen. But the angle deviations should be resolved in minutes in the two axes. For this purpose the author developed the synchro streak technique. The jet is observed in one or two or three different distances with one or two streak cameras, applying the profile streak technique in orthogonal views, so that a two dimensional analysis can be made as a function of time with very high space resolutions. Besides the wanted very accurate measurements of the jet angle deviations, also their surface structure can be observed by strong front illuminations with powerful argon flash bombs. Such synchro streak records have shown smooth jet surfaces in the tip regions, but rougher surfaces in the middle and the rear sections of the jets. The radial crater growing process as a function of time, caused by such extremely fast impactors, can be described with analytical equations. By the optical observation of the radial growth process of the jet at different penetration velocities this analytical theory was proven and confirmed. It is astonishing, that shaped charge research groups and developers are not really knowing and using the possible and relatively easily available optical diagonstic techniques, to find out the limits of the shaped charge jet performances of their designs with the manufacturing tolerances. This paper gives the optical diagnostic potentials and advanced techniques.

Paper Details

Date Published: 1 August 2003
PDF: 14 pages
Proc. SPIE 4948, 25th International Congress on High-Speed Photography and Photonics, (1 August 2003); doi: 10.1117/12.516940
Show Author Affiliations
Manfred Held, TDW (Germany)


Published in SPIE Proceedings Vol. 4948:
25th International Congress on High-Speed Photography and Photonics
Claude Cavailler; Graham P. Haddleton; Manfred Hugenschmidt, Editor(s)

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