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Common experimental configurations used to determine HE detonation velocity-curvature are right circular cylinders detonated in air. The steadily propagating detonation front is curved and its velocity depends upon the diameter of the cylinder. This configuration requires several experiments with different diameters and sufficiently long cylinders to assume a steadily propagating detonation front. This last hypothesis is practically not achieved for non-ideal HE using reasonably long cylinders. To elude this problem, a special explosive device called “logosphere”, developed by CEA, has been adapted to non ideal HE. It provides a well define spherically diverging detonation wave and allows measurements of the detonation velocity-curvature relationship by means of piezoelectric pins without any perturbation. VISAR and IDL diagnostics record the material velocities at the rear surface of the explosive through transparent windows. The particle velocity values are used to determine the curved detonation states using the detonation velocity-acceleration-curvature model of Louis Brun. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

We study preheating-induced sensitization of a TATB-based composition developed at CEA. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

The objective of this work is to clarify the mechanism of shock to detonation of nitromethane by time-resolved emission spectroscopy. This paper presents the experiments performed in the spectral range 0.3-0.85 µm. Experimental results provide several radiance values depending on wavelength and time that we compared to measurements of pyrometry previously performed. Determination of the temperature profile is treated from the resolution of the equation of radiative transfer by an inversion method. The case of the steady state detonation is considered here. [ABSTRACT FROM AUTHOR]