Electricite De France - Service National

Alcatel N.v.

Agence Nationale De Valorisation De La Recherche (anvar)

Centre Technique Industriel Dit: Institut Textile De France

Rimm Technologies Corporation N.v.

Georges Roussy

Jean-Marie Thiebaut

Jean-Yves Boniort

Claude Brehm

Bertrand Meyer

Gilbert Maire

Alain Kiennemann

Corinne Petit

Jean-Francois Rochas

Bernard Maestrali

Eric Marchal

William Benoit

Jean-Marie Jacomino

Andre-Jean Berteaud

Christophe Debard

Mina Souiri

Michel Moneuse

Bernard Dichtel

Christophe Marchand

A microwave or radio frequency device including an applicator for receiving an object to be processed, and a plurality of generators supplying power to the applicator via propagation guides. According to the invention, three propagation guides propagating the microwaves or radio frequencies generated by three respective generators are mounted on three respective plates defining a three-dimensional rectangular axis system, and symmetrical relative to a ternary axis of symmetry of the axis system, whereby the generators supplying power to the applicator are mutually decoupled. The three propagation guides have a rectangular cross-section and are mounted on respective plates in such a way that the short sides of the rectangular cross-section of said guides are orthogonal in pairs, or are coaxial cables extending in a longitudinal propagation direction perpendicular to the plates with one exposed end thereof extending into the applicator. The position of the propagation guides is variable depending on rotation thereof about the longitudinal propagation direction, and translation in a direction parallel to the plates on which they are mounted.

Microwave or radio frequency device including three decoupled generators

Output amplifier stage () of a high frequency generator () with tube () operating in class B or C has its output () looped back on the input () by means of a coaxial line () with a length equal to approximately the wave length corresponding to the operating frequency. The apparent gain of the amplifier stage () is thus increased and the output power from an intermediate amplifier () can be correspondingly reduced, amplifying a stable signal at the operating frequency.

Stage of a power generator of high frequency current

A gas phase catalytic reactor comprising a metal vessel defining a confinement volume in which electromagnetic waves are generated at a frequency greater than 10 MHz. The confinement volume contains a porous catalyst which is heated by the electromagnetic waves and which has a flow of reactive gas passing therethrough. In order to guarantee that the gas reacts only when in contact with the catalyst, a heat exchanger is used to cool the gas suddenly as it leaves the confinement volume.

Gas phase catalytic reactor

Catalytic process for controlled oxidation of methane using microwaves, characterized in that it makes use of a catalyst exhibiting in its structure electrical charge defects and geometric deformations enabling it to absorb electromagnetic energy, or microwaves, under the effect of an electromagnetic field.

Catalytic process for controlled oxidation of methane using microwaves

Apparatus for heating a silica optical fiber in a fiber-drawing installation. The apparatus is disposed at the outlet of a fiber-drawing oven to raise the optical fiber to a temperature greater than 1000.degree. C. The apparatus is constituted by a microwave generator coupled to a resonant cavity formed by a helically-wound metal wire helix fixed at opposite ends to two short circuit metal plates respectively, with the optical fiber running substantially along the axis of the helix and the helix concentric about the running fiber.

Method and apparatus for heating a silica optical fiber in a

Apparatus for measuring continuously and without contact the thickness of a thin conducting layer on a running insulating support of the fiber or tape kind, wherein the apparatus includes: a microwave generator associated by coupling means to a resonant cavity comprising a metal wire in the form of a helix which is fixed at its ends to two metal plates, said insulating support being suitable for running substantially along the axis of said helix; and means for coupling said cavity to a detection device for detecting the transmission factor of said cavity, which factor is directly a function of said thickness, said measurement being performed at constant frequency.

Microwave measuring apparatus for continuously and without contact

A resonant high-frequency or micro-wave applicator for the thermal treatment of a flat material is disclosed. This applicator comprises a flat capacitor between the plates of which the material moves and an inductor which is constituted by a metal band extending transversely the plate acting as hot electrode. The inner face of the plate acting as ground electrode is divided into elementary sections by an assembly of longitudinal grooves. Preferably, the same applies to the inner faces of the plate acting as hot electrode and the inductor.

Resonant high-frequency or micro-wave applicator for thermal treatment

The invention provides a microwave feeder or applicator, that is to say a resonant chamber for coupling to a source of microwaves, arranged for the microwave treatment of a sample of material, comprising two main conductive walls extending parallel to a common axial direction and each having two projections and a central part joining the two projections, the projections of the two walls facing one another in pairs whereas the central parts of the two walls likewise face one another and define a region in which there is a local increase in the distance between the two main walls; a first conductive end wall forming a short-circuit and extending in a plane forming a cross-section of the main walls; a second conductive end wall forming a second short-circuit extending in a plane forming a cross-section of the main walls, and a coupling means for supplying microwave energy to the feeder, the dimensions of the cavity formed by the main end walls being arranged so that the cavity resonates almost exclusively in the TE.sub.11 mode, where the electric field is oriented along the cross-section of the main walls.

Microwave applicator

Growing community of inventors

Laxou, France

Georges Roussy