Abstract: A fast scanning voltage ramp generator including at least one chain of N two-pole avalanche transistors in series and a set of N+1 zener diodes in series between a high voltage power supply and ground, where N is an integer number≧2. A streak camera can utilize this type of generator.

Abstract: This invention relates to a fast scanning voltage ramp generator comprising at least one chain of N two-pole avalanche transistors in series (T1-T8; T11-T18) and a set of N+1 zener diodes (D1-D9) in series between a high voltage power supply (HV) and the ground, where N is an integer number ≧2.

Abstract: A process for determining the intrinsic magnetic permeability of elongated ferromagnetic elements and the electromagnetic properties of composites using such elements are disclosed. According to the process, an annular core or torus is produced, which torus is wound with ferromagnetic elements. The core is placed in a coaxial line, the properties of the torus are measured, and permeability of the elements and the properties of an equivalent composite for a given polarization are deduced from such measurement. Particular utility is found in the area of study of composite charges for use at microwave frequencies.

Abstract: System for monitoring containers with ultrasonic seals.According to the invention the seal is duplicated and comprises a transmitting transducer and a receiving transducer. The exciting signal is a voltage step applied to the transmitting transducer and the circuit able to supply said step is directly connected to the transmitting transducer without a connecting cable.Application to the monitoring of containers containing dangerous products, precious materials, documents, etc.

Abstract: This seal is characterized in that the delay line is extended by a frustum-shaped part terminated by a spherical cap, which is able to receive a marking participating in the acoustic identity of the seal. The sealing capsule of the seal is perforated with an opening adapted to the dimensions of the frustum-shaped part of the identity module. The sealing cable is fixed between the module and the sealing capsule.Application to the monitoring of containers containing dangerous or precious products and the like.

Abstract: System for monitoring a plurality of containers using ultrasonic seals integral with the containers and electronic circuits connected to these seals, wherein:(A) each seal comprises an ultrasonic transmitting transducer and an ultrasonic receiving transducer making it possible to check both the identity of the marking and the integrity of the seal, the marking being located outside the seal body,(B) the electronic circuits connected to these seals comprise:(a) at least one cyclic, sequential module for the auscultation or listening to the seals having the same number of outputs and inputs as there are seals, the outputs being connected to the transmitting transducers and the inputs to the receiving transducers,(b) at least one electronic processing module connected to the listening module and controlling a sampling of the signal received.