Abstract
Precursor air shocks (PAS), which have velocities in excess to the detonation velocities, are generated in slits of high explosive (HE) charges arranged parallel or under an angle of less than 60 degrees to the detonation wave. They are arriving earlier on the end surface of the high explosive charges because the gases expand fastly in radial directions and therefore optically cover the HE surface. Therefore the later arriving detonation front can be observed no longer. But by directly covering the end surface of the HE charge with a transparent medium -- plexiglass -- with slits corresponding to the explosive charge slits, the radial expansion of the PAS's can be delayed so long that the detonation wave profile can be observed on the HE surface. With this 'trick' interesting detonation behavior aspects were found in connection with slits oriented parallel or with small angles to the detonation direction. The used test setups will be described in detail with typical test results and their analyses.
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