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Temperature measurements of shocked translucent materials by time-resolved infrared radiometry

Description: Infrared emission in the range 2 to 5.5 ..mu..m has been used to measure temperatures in shock-compressed states of nitromethane, cyclohexane and benzene and in polycrystalline KBr. Polymethylmethacrylate shows anomolous emission probably associated with some heterogeneity.
Date: June 4, 1981
Creator: Von Holle, W.G.
Partner: UNT Libraries Government Documents Department

Detonator-activated ball shutter

Description: A detonator-activated ball shutter for closing an aperture in about 300 ..mu..seconds is disclosed. The ball shutter containing an aperture through which light, etc., passes, is closed by firing a detonator which propels a projectile for rotating the ball shutter, thereby blocking passage through the aperture.
Date: May 14, 1981
Creator: McWilliams, R.A. & Von Holle, W.G.
Partner: UNT Libraries Government Documents Department

Application of fast infrared detectors to detonation science

Description: Infrared radiometers have been used to make time-resolved emission measurements of shocked explosives. Instruments of moderate time resolution were used to estimate temperatures in shocked but not detonated explosives. The heterogeneity of the shock-induced heating was discovered in pressed explosives by two-band techniques, and the time-resolved emittance or extent of hot spot coverage indicated a great dependence on shock pressures. Temperatures in moderately shocked organic liquids were also measured. Faster response radiometers with 5 ns rise times based on InSb and HgCdTe photovoltaic detectors were constructed and tested. Preliminary data on reactive shocks and detonations reveal a resolution of the heating in the shock wave and the following reaction.
Date: July 28, 1982
Creator: Von Holle, W.G. & McWilliams, R.A.
Partner: UNT Libraries Government Documents Department

Vulnerability of hot LX-17 to lightning strikes on exposed detonator and actuator cables

Description: Capacitor bank discharges with peak currents up to 700 kA were used to explode test sections of detonator cable and launch the dielectric material on top of the exploding conductor as a fast flyer plate. Velocity of the launched material, pressure profiles from the impact of the launched material and impact marks formed in aluminum witness plates were used to study the stimulus that could be transmitted to high explosive in the vicinity of the exploding cable. To quantify the risk of initiating the main charge or booster insensitive high explosive (IHE) in a weapon, one must know the threshold stimulus required for shock initiation. LX-17 samples, heated to temperatures up to 250C were impacted by 3 to 10-mm-wide stripes of 0.12-mm-thick Kapton to determine the initiation threshold velocity at ambient and elevated temperatures, The strips simulate the impact of the cover coat of a flat detonator cable which has been exploded by a lighting strike. The data allow us to assess the likelihood that a lightning strike on the cable would be able to initiate a detonation of the LX- 17 main charge.
Date: December 1, 1993
Creator: Chau, H. H.; Osher, J. E.; Von Holle, W. G.; Lee, R. S. & Moua, K.
Partner: UNT Libraries Government Documents Department