High-resolution imaging of hypervelocity metal jets using advanced high-speed photographic techniques

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Description

It is now possible to obtain high resolution sequential photographs of the initial formation and evolution of hypervelocity metal jets formed by shaped charge devices fired in air. Researchers have been frustrated by the high velocity of the jet material and the luminous sheath of hot gases cloaking the jet that made detailed observation of the jet body extremely difficult. The camera system that provides the photographs is a large format multi-frame electro-optic camera, referred to as an IC camera (IC stands for image converter), that utilizes electro-optic shuttering, monochromatic pulsed laser illumination and bandpass filtering to provide sequential pictures ... continued below

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12 p.

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Shaw, L.L. & Muelder, S.A. August 29, 1995.

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Description

It is now possible to obtain high resolution sequential photographs of the initial formation and evolution of hypervelocity metal jets formed by shaped charge devices fired in air. Researchers have been frustrated by the high velocity of the jet material and the luminous sheath of hot gases cloaking the jet that made detailed observation of the jet body extremely difficult. The camera system that provides the photographs is a large format multi-frame electro-optic camera, referred to as an IC camera (IC stands for image converter), that utilizes electro-optic shuttering, monochromatic pulsed laser illumination and bandpass filtering to provide sequential pictures (in 3D if desired) with minimal degradation due to luminous air shocks or motion blur. The large format (75mm image plane), short exposure (15 ns minimum), ruby laser illumination and bandpass filtering (monochromatic illumination while excluding extraneous light) produces clear, sharp, images of the detailed surface structure of a metal shaped charge jet during early jet formation, elongation of the jet body, jet tip evolution and subsequent particulation (breakup) of the jet body. By utilizing the new camera system in conjunction with the more traditional rotating mirror high speed cameras, pulsed radiography, and electrical sensors, a maximum amount of, often unique, data can be extracted from a single experiment. This paper was intended primarily as an oral presentation. For purposes of continuity and simplicity in these proceedings, the authors have chosen to concentrate on the development of the IC camera system and its impact on the photography of high speed shaped chargejets.

Physical Description

12 p.

Notes

OSTI as DE96001722

Source

  • 20. international symposium on shock waves, Pasadena, CA (United States), 24-28 Jul 1995

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  • Other: DE96001722
  • Report No.: UCRL-JC--120501
  • Report No.: CONF-9507152--5
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/119980 | External Link
  • Office of Scientific & Technical Information Report Number: 119980
  • Archival Resource Key: ark:/67531/metadc623712

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • August 29, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • June 23, 2016, 10:05 a.m.

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Shaw, L.L. & Muelder, S.A. High-resolution imaging of hypervelocity metal jets using advanced high-speed photographic techniques, report, August 29, 1995; California. (digital.library.unt.edu/ark:/67531/metadc623712/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.