Thomson-csf

Thales

L'etat Francais

Thales Deutschland Gmbh

Jean-Paul Castera

Georges Hepner

Jean-Marie Dupont

Brigitte Loiseaux

Pierre Hartemann

Paul-Louis Meunier

Jean-Marc Coutellier

Bernard Desormiere

Jean-Luc Rolland

Jean-Claude Mage

Christian Larat

Romain Czarny

Horst Joestingmeier

Alfred Warmuth

Bertrand Demotes-Mainard

Pierre Friez

Alain Carenco

Emmanuel Desurvire

This antenna adaptor () is intended to be placed between an antenna () and a receiving channel (). It includes: a first conductive wire () crossed by an external current (i) corresponding to a signal delivered at the output of the antenna, the first wire generating in its vicinity an external magnetic field; and a magnetometric sensor (), placed in the vicinity of the first conductive wire, sensitive to a flow of the external magnetic field and able to generate an output signal corresponding to the external current.

Antenna adapter

A traffic light luminaire includes at least one light source, a collimating device for collimating light emitted by the at least one light source, and a light distribution device for spreading the collimated light within a specific solid angle with a specific luminous intensity distribution. The light source is a high brightness light source, and the light distribution device is a microstructured distributor having a micro-structured surface, wherein each equal-sized macroscopic section of the microstructured distributor contributes to the luminous intensity distribution in the same way within said whole specified solid angle. Thereby a low maintenance traffic light luminaire is provided which generates a homogeneous light distribution for a variety of trail arrangements (right curve, left curve, straight line) independent of the distance of the viewer.

Universal traffic light luminaire

Disclosed is a magnetic head comprising chiefly two thin or thick layers of magnetic materials located in a same plane and separated by a gap layer of non-magnetic material, also made in the form of a thin or thick layer. This gap layer forms a determined angle with the plane of the layers of magnetic materials. Methods are also provided for the making of such a head. In particular, these methods make it possible to determine, with precision, the angle of the gap with the plane of the layers of magnetic materials. Applications: magnetic write/read heads for computer peripherals (using tapes or disks), and possibly video tape recorders.

Method of manufacturing magnetic write/read head and fabrication method

Integrated single-mode isolator waveguide and application to a

In a magnetic head, there is provided, in the gap, a superconducting material that has zero permeability and prevents the passage of the magnetic field in the gap. Various alternative embodiments are used to improve the efficiency of the head by channelling the magnetic flux outside the gap.

Magnetic recording/playback head comprising a superconducting material

The invention relates to tunable selective devices based on magnetostatic volume waves and has as its object to provide a device comprising two resonator networks arranged to exchange magnetostatic volume waves via a selective return reflector network, in which the reflector network is devised so as to eliminate the longitudinal intereference modes present around the required longitudinal mode. The invention is applicable in particular to the filtering of electrical signals at very high frequency, to the production of tunable oscillators and to the measurement of magnetic fields.

Tunable selective devices based for magnetostatic volume waves

The invention relates to devices utilizing magnetostatic waves. The invention has as its object a filter microtape which is able to pick up and selectively dissipate magnetostatic waves as a function of their wavelength. The filter microtape is permeable to waves of which the wavelength is a submultiple of its width. The invention is applicable in particular to tunable magnetostatic wave devices such as delay lines, resonators and oscillators.

Filter device utilizing magnetostatic waves

Microwave oscillator using magnetostatic surface or bulk waves which can be transmitted in a thin layer of magnetic material having two cavity resonators with coupled gratings of different equivalent lengths in such a way that the first is multimode and the second monomode in the reflection pass band of the gratings, the cavities being arranged in such a way that the second filters the modes transmitted in the first. Microwave signals are applied to one of the two cavities and the resonated waves are collected in the second cavity.

Tunable microwave oscillator using magnetostatic waves

The invention relates to an accelerometer comprising at least one elastic plate propagating elastic surface waves, to which a normal force is applied resulting from the action of the acceleration which is to be measured on a solid or liquid body of predetermined mass. The measurement of the deviation in frequency of the oscillator of which the plate is a part gives an indication of the value of the normal component of the acceleration.

Elastic surface wave accelerometer

The device according to the invention comprises a wave guide formed by a thin layer of a ferrimagnetic garnet deposited onto a substrate, preferably by epitaxy, and capable of propagating first and second modes of radiated energy, means for exciting the first mode in said layer, means for inducing a magnetic field in the propagation direction to enable at least a fraction of the propagated energy to be transferred from the first mode towards the second mode, means for selectively transmitting one of the two modes situated in front of the guide, for example a metallic layer deposited onto the thin layer and means for extracting the energy of the transmitted mode.

Device for modulating optical radiation by a variable magnetic field

The invention relates to an electrically-controlled optical branch connection, for the guiding of an optical radiation from one input optical fibre to one of n output fibres or vice versa, obtained by associating a plurality of basic cells. Each basic cell comprises an optical guide capable of being controlled electrically so as to produce or not produce, depending on the control signal, a rotation through .pi./2 of the linear polarization at the input of the guide. The axes are so chosen that the polarized radiation issuing from the guide is propagated in the ordinary direction or the extraordinary direction in a bi-refracting plate.

Electrically-controlled optical branch connection

The arrangement according to the invention comprises three branches 1, 2 and 3 and enables a polarized radiation to be transmitted from the branch 1 towards the branch 2 or from the branch 2 l towards the branch 3. It comprises polarization separating means forming a fork between the branches 1 and 3 on the one hand and the branch 2 on the other hand, the common section of said fork communicating with the branch 2 through non-reciprocal means which turn the polarization of the radiation through 45.degree..

Arrangement for transmitting polarized optical radiations

The invention concerns the magneto-optical deflectors which enable an incident beam of radiant energy to be deflected in a variable manner under the control of a magnetic field. It consists in using a thin film of a magnetic material forming a diffraction grating, means for travelling the incident beam along the plane of this thin film, and means for magnetically controlling the step-width of the grating, thus controlling the angle of deflection given by this grating.

Growing community of inventors

Chevreuse, France

Jean-Paul Castera