Science and Technology of Energetic Materials

Vol.63, No.2 (2002)

Research paper

Initiation threshold energy of silver azide pellets by Nd:YAG laser irradiation(*in Japanese)
Toshiharu Mizukaki, Halald H.Kleine, and Kazuyoshi Takayama


In this paper, threshold laser energy for initiation of micro-explosives, silver-azide(AgN3) of size 1.5 mm in diameter and 1.5 mm in length, has been studied using two experimental methods to verify their results each other. First one was a method that decreases laser beam intensity by neutral density filters. The other one was a method that diverges laser beam by concave lens. A small pulsed Nd : YAG laser, wavelength 1064 nm irradiation, was used in this study. The two results were well agreed, that was 3.57 ± 0.41 mJ / cm2. We also focused on delay time of initiation at the energy of near threshold. Travel times of blast wave by detecting overpressure of incident shockwave, were compared between in the case of enough energy and in the case of slightly over the threshold energy for initiation. Visualization of explodes were also done by double exposure holographic interferometer. Any initiation delay, however, were not found in this study.

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