Abstract: The invention relates to an optical device which is used to form a fingerprint image. The inventive device comprises an optical plate (1) having a first main face (2) on which a finger (3) is placed, a first side face (4) comprising a converging mirror, and a second side face (5) which is disposed opposite the first side face and which forms an output face, a focusing lens (9) being disposed opposite said output face (5). According to the invention, the first main face (2) forms an angle greater than 90° with output face (5), such that: the incidence of light rays on the first main face, inside the optical plate, is increased; the stray radiation at the output face is reduced; and a thinner plate can be used.

Abstract: A telephone communication system comprising a radiocommunication module (10) and a data encryption/decryption module (28), characterized in that the radiocommunication module (10) comprises a modem interface module (20) which is connected to the radiocommunication module (10) and controls an external modem (33). The encryption/decryption module (28) comprises a microcircuit support reader, an encryption/decryption circuit (29) and a vocoder circuit (30) receiving voice data to be encrypted or decrypted from the communication module (10). The encryption/decryption (29) of data is carried out directly in the encryption/decryption circuit (29) of the encryption/decryption module.

Abstract: In an implementation in rate gyro mode, the method includes exciting the vibrating member with a combination of control signals including an amplitude control signal at a frequency twice the resonant frequency, and a quadrature control signal at DC. In free gyro mode, the method includes the steps of applying a combination of signals to common electrodes 5 and of applying the combination in alternation to main electrodes 5.1 and 5.2 and to auxiliary electrodes 7.1 and 7.2 interleaved between the main electrodes.

Abstract: The cooled photosensitive cell (1) according to the invention comprises a table (2), a sensor (3) which is fitted on the table (2) and is connected to electrical connection tracks (30), a screen (10) to prevent parasitic radiation on the sensor (3), and a Joule-Thomson cooler (4) in order to cool the table (2) and the screen (10). The table (2) and the screen (10) are cooled by convection by being subjected directly to the volume of expansion of the cooler (4), the table (2) being provided with apertures (6) for passage of the cooling flow communicating with a cavity (14) for cooling of the screen (10).

Abstract: In an implementation in rate gyro mode, the method includes exciting the vibrating member with a combination of control signals including an amplitude control signal at a frequency twice the resonant frequency, and a quadrature control signal at DC. In free gyro mode, the method includes the steps of applying a combination of signals to common electrodes 5 and of applying the combination in alternation to main electrodes 5.1 and 5.2 and to auxiliary electrodes 7.1 and 7.2 interleaved between the main electrodes.

Abstract: A method and corresponding system use a Personal Computer Memory Card International Association (PCMCIA) card to remotely communicate and interface with flight performance data on an aircraft. The PCMCIA card can be plugged into an Aircraft Condition Monitoring Systems (ACMS) using a card interface. The method and system offer a global communication architecture that can be implemented with existing ACMS devices and with any flight data acquisition unit (FDAU) equipped with a storage card, such as a PCMCIA card. The PCMCIA card offers real-time wireless communication between the ACMS on an aircraft and a ground station without any hardware and/or software modifications to the ACMS.

Abstract: The thermal accelerometer of the invention comprises an enclosure having disposed therein a central filament powered by alternating electric current of zero mean amplitude and having a frequency lying between first and second resonant modes of vibration of the central filament, the central filament lying between detector filaments adjacent to reaction filaments powered by alternating electric current of zero mean amplitude and having a frequency lying between the first and second resonant modes of vibration of the reaction filaments.

Abstract: The inertial rotation sensor comprising a vibrating resonator associated with transducers defining a pair of control channels and a pair of detection channels, preferably comprises a single multiplexer member for all of the channels, the multiplexer member being associated with a processing unit generating cycles comprising control action times on each control channel followed by detection action times on each detection channel, with two succession action times being separated by a relaxation time.

Abstract: A process for the electronic stabilization of the images of a scene of a snapshot capturing apparatus of an imaging system in which, in a terrestrial reference frame, the images of the scene captured by the apparatus are filtered in a low-pass filter, so as to retain only the low spatial frequencies thereof, and the optical flow equation is solved to determine the rotations to be imposed on the images in order to stabilize them with regard to the previous images is provided. The invention also relates to a process for correcting offsets in grey levels of a snapshot capturing apparatus of an imaging system whose images are stabilized according to the process of the invention, where the calculation of the offsets is deduced from the steps of the stabilization process.

Abstract: Method for guiding a rocket (1) to a target, wherein, the rocket (1) being equipped with automatic guiding means with an image-formation device (10) and means for correction of the trajectory (11): the target is acquired by a sighting device and its position is determined; the sighting device and the rocket image-formation device (10) are brought into line; the images of the rocket image-formation device (10) are stabilized; a guiding law is produced; the rocket (1) is launched; and the rocket is guided according to this law until the rocket itself acquires the target.

Abstract: A telecommunication cable of the microcable or minicable type having optical fibers (2) contained in a thin retaining sheath (3) includes an external layer (4) extending concentrically around the retaining sheath. The external layer has a friction coefficient lower than that of the retaining sheath and a stiffness greater than that of the retaining sheath. These characteristics reduce friction and increase the stiffness of the cable when the latter is installed by blowing or floating in a conduit.

Abstract: In a method for the management of a communications module on a telephony network, the module is connected to a terminal that is incapable by itself of getting connected to the telephone network. The module has a tool kit microcircuit whose management is shared between the module and the terminal so as to limit communications on a link between the module and the terminal. The module and the terminal exchange messages in the HAYES format in order to standardize an interface between the module and the terminal. The messages exchanged are command messages, responses to commands, or general information on the state of the device.

Abstract: The invention concerns a device for fixing and adjusting a member to be supported, characterised by the fact that it comprises: a support base (1); two triangular levers (6), each of the said levers comprising two arms (7, 8) disposed in a triangle and connected together at one of the vertices (9) of the triangle, each of the said levers being articulated on the said base at its respective vertex, a first one (7) of the two arms of each lever being extendable and connected at its free end to means of fixing (14) to the said member; and an adjustment means (5) mounted on the said base and arranged to make the second arm (8) of each lever pivot in the plane of the said lever. Application to the fixing and adjustment of a precision optical element.

Abstract: Data packets are transmitted in a secure manner from an external network to a secure network. The secure network and the external network are interconnected via a firewall comprising a first interface with the external network and a second interface with the secure network. The firewall provides, over the second interface, a plurality of virtual interfaces. An association between items of specific information of the firewall and said virtual interfaces is stored in the firewall and in the secure network. It is determined whether to authorize the transmission of a packet received from the external network to the secure network on the basis of predefined security criteria. If the received packet is authorized, an item of specific information is selected to be transmitted to the secure network with the authorized packet. A virtual interface is then determined as a function of the item of specific information selected on the basis of the association.

Abstract: The invention concerns a laser pointing sighting system comprising a designator range finder (19) including means (E) for emitting a designating laser beam and reception means (R) for detecting and processing the reflection of a hot spot formed by said beam on a target, said reception means (R) are capable in the absence of designating beam emission by the range finder, of detecting the reflection of a hot spot formed on a target by a third designating device, the system comprising means capable, when the reception means detect such a hot spot, of being automatically oriented relative to the direction defined by said spot.

Abstract: In an implementation in rate gyro mode, the method comprises the steps of exciting the vibrating member by means of a combination of control signals comprising an amplitude control signal at the resonant frequency of the vibrating member or at a frequency twice the resonant frequency, a precession control signal at a frequency twice the resonant frequency, and a quadrature control signal at DC, at the resonant frequency, or at a frequency twice the resonant frequency. In free gyro mode, the method includes the steps of applying a combination of signals to common electrodes 5 and of applying said combination in alternation to main electrodes 5.1 and 5.2 and to secondary electrodes 7.1 and 7.2 interleaved between the main electrodes.

Abstract: In an implementation in rate gyro mode, the method comprises the steps of exciting the vibrating member by means of a combination of control signals comprising an amplitude control signal at the resonant frequency of the vibrating member or at a frequency twice the resonant frequency, a precession control signal at a frequency twice the resonant frequency, and a quadrature control signal at DC, at the resonant frequency, or at a frequency twice the resonant frequency. In free gyro mode, the method includes the steps of applying a combination of signals to common electrodes 5 and of applying said combination in alternation to main electrodes 5.1 and 5.2 and to secondary electrodes 7.1 and 7.2 interleaved between the main electrodes.

Abstract: The invention relates to a device for displacing a moving part along a longitudinal axis relative to a housing, said device being symmetrical about a plane extending longitudinally relative to the moving part, the device comprising two structures that are secured to said moving part and elements of active material comprising at least two blocks extending between inside walls of each structure, with the elongation directions of the blocks being antisymmetrical about an axis substantially perpendicular to the displacement axis of the moving part, wherein the structures are flexible and suitable for displacing the moving part by deforming as a function of the elongation of the blocks.

Abstract: The method of recognizing fingerprints comprises an analysis step (21) in which an expert analyses characteristic points of a fingerprint image so as to be able to differentiate the fingerprint whose image is presented to him. The method comprises a modification step (19) in which the said print image available with various levels from a grey scale is modified into a second image in which at least one grey range of the first image is parameterized so as to be represented with various levels from a colour scale. The modification makes it possible to identify the characteristic points on an unknown fingerprint image more accurately and also to compare the said image to other known fingerprint images more easily.

Abstract: The invention concerns a removable linking device 1 between a first element 3 and a second element (2). It comprises a reception cradle (13) delimited by the first element (3), on the one hand, and a connecting means (20) integral to the second element (2) on the other hand, the said means (20) being connected to the cradle (13) on one side by holding means (21) and, on the other, by a flexible means (22) which can be eliminated to allow the separation of the two elements. The cradle (13) delimits a reception space (14) in which the connecting means (20) is inserted. The cradle (13) delimits a reception wall (15) of the holding means (21).