Office National D'etudes Et De Recherches Aerospatiales

Avions Marcel Dassault-Breguet Aviation (amd/ba)

Gerard Labaune

Francois Issac

Vincent Gobin

Serge Larigaldie

A surface impedance measurement device comprises a transmitting antenna producing a magnetic field in the area surrounding a material to be tested and a receiving antenna receiving the magnetic field. An electric voltage wobbled in frequency is applied to the transmitting antenna, and a circuit measures the voltage at the terminals of the second antenna. For the antennae to be applied on the same side of the material to be tested and of which the surface impedance is to be measured, the antennae are superposed by the intermediary of a dielectric wedge in a compact probe. The impedance measurements are then independent of the dimensions and geometry of the material.

Variable frequency magnetic field device employing multiple antennae for

A flash-spark creeps on a dielectric surface to ignite carburated gaseous xtures. A high voltage pulse is applied through the dielectric between opposite surfaces thereof. The voltage is applied between a first electrode having a smaller area abutting against a first surface of the dielectric and a second electrode having a first strip portion abutting against an opposite second surface of the dielectric and a second portion which is astride an edge of the dielectric. The strip portion ends at a position beneath the first electrode. The first surface is exposed to the carburated gaseous mixture.

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Palaiseau, France

Gerard Labaune