Abstract: The invention is a method of producing a multilayer polymer-metal system to interconnect integrated circuits which allows two-dimensional electrical and/or optical connections between components, in which a first layer of polymer is deposited on a rigid substrate such that the layer can be separated from the substrate, in which a multilayer interconnection system is then produced on this first layer using industrial methods and in which the rigid substrate is removed after installation and connection of the integrated circuit.

Abstract: The antenna is provided with an array of optically controlled elementary reflectors with phase-shifters. The array of elementary reflectors comprises a substrate made of a dielectrical material with low microwave losses, transparent to light, the substrate being coated, on the side exposed to the microwaves, with a layer of photoconductive elements distributed in an array and, on the opposite side, with a conductive electrode transparent to light. An optical system for the selective illumination of the photoconductive elements are used to make these elements go from an electrically insulating state to a conductive state and vice versa to modify the path of the microwave within the reflectors and enable the formation of the beam. The array of photoconductive elements forms a lattice of smaller meshes sub-dividing the lattice of the array of elementary reflectors.

Abstract: An opto-electronic device which monolithically integrates a laser emitter and an optical detector positioned in-line on a single waveguide, in which the laser emitter and detector operate at different wavelengths. Such an opto-electronic device may find particular application in various transmission or telecommunication systems.

Abstract: The invention relates to a method of photodetection for a panoramic camera and to a system for implementation of such a method. A panoramic camera can incorporate a photodetector system of the charge transfer type, an optical system for focusing on a sector of the field of observation and a mechanical rotational drive system for the support having a vertical axis of the assembly. The camera incorporates a photodetection system including at least one module constituted by contiguous arrays (b.sub.1 to b.sub.n) arranged vertically, structure permitting the integration of the charges in synchronism with the rotation of the support, structure for varying the number of activated arrays and for comparing the luminance levels received successively by the elementary cells of the various arrays situated at the same height. The invention also applies to target seeking and to the rapid detection of false alarms due to noise peaks.

Abstract: This optical device comprises, at the rear of the projectile (3), a catadioptric system (15) equipped with a polariser (16) and, at the firing station of the projectile (3), a light source (5) whose beam illuminates the rear of the projectile (3) and a light-flux analyzer (6) calculating from the polarization direction of the light flux reflected by the projectile (3) the roll angle of the latter. It is noteworthy in that it comprises, in order to remove the ambiguity of .pi. from the measurement of the roll angle, a reflector dihedron (20) which is positioned along the side of the projectile and which reflects the light beam from the source (5) back to the light-flux analyzer (6) once per turn of the roll of the projectile (3) when the light source (5) is not blocked from it by the body of the projectile (3).

Abstract: The invention relates to the reading of optical disks in which the recording is performed in volume in separate layers. Reading a bit recorded within the layers gives a signal with a background noise from all the adjacent bits illuminated by the read beam. In order to eliminate this background noise, the read beam is modulated in position about the bit to be read, either horizontally or vertically with respect to a recording level. The background noise remains unchanged but the signal from the bit being read becomes a periodic signal.

Abstract: An apparatus for a visual display in a training simulator. A projector illuminates a convex side of a spherical screen. A concave face of a spherical mirror facing the convex side of the spherical screen reflects the image on the spherical screen to a viewer. A second embodiment projects an image on a first mirror. The projected image is reflected onto a convex portion of a spherical screen. The image on the convex portion of the spherical screen is reflected to a concave mirror facing the convex face of the screen. A viewer sees the projected image on the concave mirror. The first mirror and the second mirror can be formed as one mirror.

Abstract: A method for the closing, by laser, of packages of electronic circuits, notably hybrid circuit packages, said method minimizing mechanical stresses. The soldering is done along a soldering path on the lid of the package. The soldering path is divided into segments and two consecutive segments are never soldered one after the other. The method can be applied to the closing of large-sized hybrid packages.

Abstract: The invention relates to a device for monitoring of alignment of two optical paths, a laser aiming path and an infrared imaging path.The monitoring device according to the invention is composed of two half-housings, and of a cassette containing a polyimide film (11) and means of advancing of this film.The housing acts as a cube corner in order to re-emit, from an incident laser beam (FL) to an infrared beam (FI) which is collimated and strictly parallel or coincident with the incident beam (FL) by heating of a an optical system for focusing/collimation (15 to 21). The position of the hot point visually displayed on the infrared detector makes it possible to measure the alignment offset of the two paths.Application to systems for target designation by laser guidance with two separate or partially coincident optical paths.

Abstract: Magnetic read heads with magneto-resistance effect of the multilayer type, are provided in a new arrangement making it possible in particular to facilitate a collective arrangement of these heads. Each read head comprises a magneto-resistance element formed by a sensitive magnetic layer superposed on a stable magnetic layer. Each read head comprises a magnetic circuit in a ring opened by an air gap, the sensitive magnetic layer being inserted in the magnetic circuit in a ring, the stable magnetic layer being outside the ring of the magnetic circuit. The arrangement of the magnetic read heads is particularly adapted for reading high density magnetic storage media.

Abstract: A quantum well wave modulator comprises a central well sandwiched by two lateral wells. The central well is populated with electrons and the two lateral wells, having different constitutions, are coupled to the central well so as to modulate two light waves under the effect of the application of an electrical field perpendicularly to the structure in one direction or in the opposite direction.

Abstract: The invention relates to composite conducting polymers.It comprises producing a composite polymer comprising a base polymer formed from a normal polyurethane in which a conducting polymer formed from doped polypyrrole is dissolved.It enables a conducting polypolymer to be obtained, the mechanical characteristics of which are very substantially those of a normal polyurethane.

Abstract: A structure providing a monolithic integration of an optical detector with an optical transmitter working in the region of the visible or the near IR spectrum. This source type makes it possible to transpose a perceived image belonging to a wavelength region to another wavelength region with a good output (photons/electrons coupling). Such a device may find particular application in imagery and signal processing systems.

Abstract: The disclosure relates to guidance devices on board autonomous vehicles or robots which have to move about notably in environments that are inaccessible or dangerous to human beings. Disclosed is a device for the detection of the environment, and the positioning and/or the guidance of a mobile vehicle on the ground, of the type comprising, firstly, means for the generation and transmission of a signal that can be reflected by a fixed obstacle and, secondly, means for the reception and processing of the signal reflected by said fixed obstacle, said processing means enabling the recognition of the environment and/or the guidance of said autonomous mobile vehicle, said transmitted signal being a millimetric wave radar signal and said transmission and reception means cooperating with a rotary antenna having a 360.degree. rotation in azimuth.

Abstract: Process for the recognition of an aerial target from samples of its radar echoes. First, Doppler radar emission is transmitted in the direction of the target. A Doppler spectrum echo signal of the target is then detected. At the center of the signal, a principal line corresponding to the aircraft's velocity is detected. The distance between this principal line and secondary lines of the spectrum signal is then determined. From the value of this distance and the relative configuration of the spectrum signal, the target can be classified into a predetermined target category. In this step, in particular, at least one intrinsic parameter of the spectrum signal can be determined, e.g., the number of secondary lines, the intensity of the secondary lines relative to the principal line, the absolute intensity of these secondary lines with allowance for the distance of the target, the equivalent radar surface of the target.

Abstract: A process for depositing a thin layer of a ceramic composition on a substrate, which comprises:a) dissolving basic constituents of the ceramic composition, which are added in simple or mixed form to a solvent;b) adding to the solution, acetylacetone and hexamethylene tetramine in proportions suitable to the deposit method used;c) maturing or polymerizing the substance obtained in step b);d) depositing a layer of the substance on a substrate;e) drying the deposited layer, andf) sintering the layer deposited at low temperature.

Abstract: The disclosure relates to devices for the measurement of signals in the field of wideband phenomena. More precisely, a device is disclosed for the processing of electrical signals coming from a derivative type of sensor designed to measure an electrical or magnetic field, currents, surface charges or other derivative variables, said processing including the computation of the primitive of the part of said signal having a spectral frequency higher than a low frequency f.sub.1, the device comprising:means for the electronic integration of said signal, from a frequency f.sub.2 higher than said low frequency f.sub.1 ;compensation means amplifying and integrating said signal between the frequencies f.sub.1 and f.sub.2. FIG. 2 .

Abstract: This microwave link connects a fixed set of electronic equipment to a mobile set of electronic equipment that can be shifted between two extreme positions, at least one of which is an operating position. The link is, for example, one between a radar transceiver and a radar antenna that can be retracted into a silo. It is constituted by a sequence of rigid rectangular waveguide elements hinged at their ends by means of hinges comprising at least one rotating connector formed by two rectangular-window flanges, fitted together and rotational movable with respect to each other. This rotational connector has two operational positions at 180.degree. with respect to each other where it can transmit microwave power and where the rectangular windows of its flanges coincide, and it assumes one of these operational positions when the movable electronic equipment is in the operating position.

Abstract: The disclosed method comprises a learning phase, during which the object zone to be recognized, selected in a learning image, is modelized, and a recognition phase during which the modelized zone is compared with image zones of a same size taken taken from the images to be processed.

Abstract: A method of breaking up a vocal signal into binary frames of a predetermined duration. The frames are grouped together in packets of successive frames by associating a predictive filter with each frame of a packet. Furthermore, the coefficients of each predictive filter are quantified by taking into account the stable or non-stable configuration of the vocal signal.