Thomson-csf

Jean-Pierre Le Pesant

Claude Michel

Michel Hareng

Bruno Mourey

Marc Turpin

Didier Pribat

Jean-Noel Perbet

Jean-Pierre Huignard

Jean-Michel Vignolle

Jean-Pierre Herriau

Marie-Noelle Charasse

Marie-Noel Charasse

The disclosure concerns the making of microcomponents belonging to the family of vacuum tubes of the diode, triode and electroluminescent component type. The goal thereof is notably to resolve problems of fabrication under vacuum, and of precise anode-cathode spacing. This goal is achieved by means of a microcomponent of the stacked structure type wherein the anode is made in the form of a metallic layer for the sealing of said cavity under vacuum containing the microcathode, and wherein at least one solid dielectric layer provides for the spacing between said anode and said microcathode.

Electronic micro-component self-sealed under vacuum, notably diode or

An optical device, similar to binoculars, which includes, between the objective lens and the eyepiece a miniature screen displaying an image controlled by a computer, and an optical reflex device capable of superimposing the screen image on the image seen through the objective lens. The device also includes, selectively or cumulatively, a variable light attenuator and a light amplifier for night vision. The device can be used, in conjunction with a computer, to add further information on geographic positions, friends, enemies, infrared images, etc. into the scene seen through the binoculars.

Twin-image binoculars

Material made up of a thin layer between two surfaces, a first and a second, to be used as the third layer of a transparent goggles face, the first layer being a screen and the second layer being a thickness layer, remarkable in that the material consists of a formable transparent polymer matrix having a refractive index and containing micro-cavities in the form of lenses, the micro-cavities being made from a transparent material different from that of the matrix, the refractive index of the material of the micro-cavities changing under the influence of an electric field applied across it, for a first field value the refractive index being equal to that of the matrix, and for a second field value being greater than that of the matrix, a pair of electrodes being associated with each micro-cavity.

Weapon aiming device having microlenses and display element

Goggles having microlenses and display element

Weapon aiming device

The invention is a hollow fiber with, over the full length of the fiber and between each fiber channel (3, 4) and the core, at least one stress zone (5, 6) to create an anisotropic stress distribution which subjects the fiber core to a tensile stress. The cable design is advantageous in that it is possible to control the sign of the fiber intrinsic birefringence. The cable is thus advantageous for use as a pressure sensor or pressure transducer.

Optical fiber sensor and a manufacturing process for making same

A process for producing an optical fiber comprising the following stages: a stage of production of a preform having an axis of symmetry and their ends and comprising an optical core as well as at least one cylindrical recess whose axis is parallel to the axis of symmetry of the preform; a drawing stage at a temperature making possible the softening of the drawn part of the preform to obtain a hollow optical fiber, characterized in that it comprises, after the preceding stage of production of the preform: a stage of attachment in a tight manner, to one end of the preform, of a hollow chamber whose cavity communicates with the recess of the preform. The cavity also communicates with a pneumatic regulation device. The drawing stage comprises a pneumatic regulation of the gas contained in the cavity and in the recess with the help of the pneumatic regulation device.

Process and device for producing a hollow optical fiber

The disclosure concerns the making of microcomponents belonging to the family of vacuum tubes of the diode, triode and electroluminescent component type. The goal thereof is notably to resolve problems of fabrication under vacuum, and of precise anode-cathode spacing. This goal is achieved by constructing a microcomponent of the stacked structure type wherein the anode is made in the form of a metallic layer for sealing the cavity under vacuum containing the microcathode, and wherein at least one solid dielectric layer provides for the spacing between the anode and the microcathode.

Method of fabricating an electronic micro-component self-sealed under

The disclosed optical fiber sensor uses the effect of variation in the birefringence in a birefringent optical fiber as a function of the stresses and of the temperature. It has a linearly polarized, wide-spectrum source coupled to a polarizing-preserving single-mode optical fiber, along one of its neutral axes, devices capable of inducing coupling points being distributed along this fiber. A polarizer at 45.degree. with respect to the neutral axes of the fiber is placed at output of this sensor fiber. The output radiation is analyzed by spectroscopy, for example in a scanning Michelson interferometer associated with a detector. The detection by the interferometer enables the identification of the devices that are subjected to stresses. The same type of device may be used for the simultaneous detection of the stresses and/or the temperatures. The disclosed device can be applied notably to the monitoring and supervision of any installation in which strains have to be detected.

Optical fiber sensor

In a device for switching a light beam, the conditions of propagation of the beam are modified locally under electric control by interposing on the beam path a fluid which modifies the conditions of refraction of the medium traversed by the beam.

Device for optical switching by fluid displacement and a device for the

The present invention concerns a device where the commutation of a luminous beam is ensured by the electrically controlled presence or absence, on the path of the beam, of a fluid causing said beam to be transmitted or reflected. The invention provides for improved decoupling between the output channels of the device, due to the presence of a surface provoking a total internal reflection that allows one to eliminate interference reflections.

Electrically controlled optical switching device

Optical modulator of a light beam comprising cells employing the displacement of an absorbent liquid and arranged in series on the path of the beam with a liquid displacement cell permitting a reflection of the beam.

Optical modulator

The displacement of a fluid is controlled electrically in a device employed primarily for storage and display of digital data. The device comprises a capillary space delimited by two confinement plates, the internal faces of which are fitted with electrodes connected to an electric generator. The capillary space is shared by two immiscible fluids and at least one displaceable fluid marker is created within the capillary space in the form of a globule of the fluid which has the highest dielectric permittivity.

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Gif sur Yvette, France

Jean-Pierre Le Pesant