NANOSECOND PHOTOGRAPHY OF FAST PROCESSES IN INVISIBLE (UV) LIGHT WITHA NITROGEN LASER AND NEW STUDY OF A TRAIN OF SHOCK-WAVES

A simple and effective methOd for nanosecond photography of fast proce sses is described. It uses self-shortened UV pulses from a nitrogen la ser. This method has been used to detect new processes in shock-wave p hysics: a generation of a train of shock waves in air and water during fluctuations of energy release (oscillations of the current in a disC harge circuit). It thus becomes possible to study the interior of the shock wave and a directed propagation of shock waves in the flow of a heated or light gas. A train of shock waves can be used for effective reflection of rf and visible radiation.