Enhancement of laser absorptivity properties of HEX

Fabrice Lacroix; Bernard Gautier

doi:10.1117/12.414000

25 January 2001 Enhancement of laser absorptivity properties of HEX

Fabrice Lacroix, Bernard Gautier

Proceedings Volume 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (2001) https://doi.org/10.1117/12.414000
Event: XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, 2000, Florence, Italy

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.

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Fabrice Lacroix and Bernard Gautier "Enhancement of laser absorptivity properties of HEX", Proc. SPIE 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (25 January 2001); https://doi.org/10.1117/12.414000

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KEYWORDS

Absorption

Carbon dioxide lasers

Nd:YAG lasers

Semiconductor lasers

Explosives

Thermal modeling

Optical properties

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