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Proceedings Paper

Enhancement of laser absorptivity properties of HEX
Author(s): Fabrice Lacroix; Bernard Gautier
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Paper Abstract

In this paper we report measurements (0.3 < ?(?m) < 2) of the diffuse reflectivity and absorptivity of TNT obtained from different manufacturing processes (cast or compressed) and HMX. Particular emphasis is placed on the Nd:YAG laser (? = 1.064 ?m). It has been found that the diffuse reflectivity of TNT increases from about 50%for the cast material to 97% for the compressed one; furthermore, liquid TNT (T >81 ¡C) appears to be quite transparent. The laser beam volume absorption has been computed according to the Kubelka-Munk (KM) semi-empirical model including our own measurements. This diffusion model has been incorporated into a 2D numerical code of heat conduction of reactive materials in order to predict thermal ignition. Numerical applications of this model are in agreement with the concept of "critical laser intensity", providing material phase changes are taken into account. Otherwise, the same numerical model has been used in order to optimize the dopant (CB) concentration in HMX to enhance its thermal ignition. It has been shown that a very low CB concentration (< 1 %) has a dramatic effect on the optical properties of doped HMX.

Paper Details

Date Published: 25 January 2001
PDF: 4 pages
Proc. SPIE 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (25 January 2001); doi: 10.1117/12.414000
Show Author Affiliations
Fabrice Lacroix, French-German Institute of Saint-Louis (France)
Bernard Gautier, French-German Institute of Saint-Louis (France)

Published in SPIE Proceedings Vol. 4184:
XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference
Antonio Lapucci; Marco Ciofini, Editor(s)

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