INITIATION OF DETONATIONS IN CONDENSED EXPLOSIVES WITH A LASER (VOZBUZHDENIE DETONATSII KONDENSIROVANNYKH VV IZLUCHENIEM OPTICHESKOGO KVANTOVOGO GENERATORA),
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
Previous experiments have shown that strong light pulses from gas discharge lamps can initiate detonations of primary but not of secondary explosives. The present study showed that detonations of lead azide and PETN can be induced by a Q-modulated laser. The laser contained a neodymium glass plate 10 x 120 mm and was Q-modulated with a rotating prism 25,000 rpm. The starting pulse was recorded on one track of an OK-21 oscillograph. The signal from another photocell recorded on the second track indicated the instant when the detonation wave reached the end of the charge. The explosives with a 1 gcc density were placed in an organic glass shell with a 10 mm inner diameter and a height of 5 mm. The starting pulse had an energy of 10 Mw, a duration of 0.1 msec, and a beam diameter of 15 mm. The lead azide was detonated with a laser beam energy on the surface of 0.08 Mwsq mm, while the PETN detonated only at considerably higher intensities attained by focusing the beam. This intensity was higher than that achieved by ordinary light pulses. The results also showed that transition to detonation is as fast as in impact-detonated charges. This was proved by using the charge detonated by the laser to detonate a second charge placed behind it.
- Lasers and Masers
- Ammunition and Explosives