Abstract: A device for coupling microwave energy with at least one exciter, and for distributing it therealong for the purpose of producing a plasma, includes a first enclosure whose inside is bathed in microwave energy, a second enclosure containing a gaseous medium to be ionized, and a first series of at least one communication passage between the two enclosures. An exciter is mounted to pass through each communication passage at a distance from the inside surfaces and to extend into the first and second enclosures in order to couple with a portion of the microwave energy and convey the coupled microwave energy locally into association with the gaseous medium. The exciter constitutes, together with the passage and portions of the sidewalls of the enclosures facing the exciter, a coaxial-type structure.

Abstract: Method and device for exciting a plasma using microwaves at the electronic cyclotronic resonance.The device for exciting a gaseous medium by microwaves comprises at least a co-axial structure for introducing the microwave power inside a multipolar confinement structure and at least one antenna coupled to said co-axial structure for the localized introduction of the microwave energy inside said multipolar magnetic confinement structure which comprises a set of permanent magnets creating a network of surfaces having a constant magnetic field and presenting locally an intensity which corresponds to the electronic cyclotronic resonance, and said antenna being positioned on said network of surfaces of constant magnetic field in an area of intensity corresponding to the electronic cyclotronic resonance.The invention finds an application in the creation of a homogenous, isotropic plasma of large volume and high density, which is free of fields in the area of use.

Abstract: The invention relates to a temperature measuring method and device. The device comprises a diffraction grating raised to the temperature to be measured, a monochromatic light beam source in which the beam is directed on to the grating and means for measuring the angular position of the diffracted beam.It is used in measuring the temperature of materials immersed in an ionized medium.