1 January 1997 Measurement of behind-armor debris using cylindrical holograms
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Cylindrical holography is being developed in order to capture 180-deg fields of view of ballistic events. The ultimate goal is to capture a three-dimensional reconstruction of the fragments fields, within a computer, that exist behind an armor plate that has been penetrated by a projectile. In this paper, we detail the methodology, design, and experimental results for a cylindrical hologram system used as the first stage of a data capture system. An 18-ns-pulse-width, 3-J ruby laser is used as the illumination source for these 45.7-cm-diam holograms. Descriptions of the optical layouts for recording and reconstructing these holograms are presented. For ballistic applications, the primary challenge has been the mitigation of the large flash caused by the projectile-target interaction. Temporal and spectral data from the flash are presented, followed by several possible flash reduction techniques, including narrowband and neutral-density filtering. Experimental holographic results for this ongoing effort are presented.
Christopher Scott Anderson, Christopher Scott Anderson, Joseph E. Gordon, Joseph E. Gordon, David B. Watts, David B. Watts, James S. Marsh, James S. Marsh, } "Measurement of behind-armor debris using cylindrical holograms," Optical Engineering 36(1), (1 January 1997). https://doi.org/10.1117/1.601189 . Submission:

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