Abstract: The invention relates to a hood for sucking-up fine particles, including: a mouth intended to be placed close to a wall, a base having a window through which a laser beam can pass, an intermediate portion between the mouth and the base, and a suction outlet disposed on the intermediate portion of the hood and designed to suck-up fine particles. The hood is characterized in that it comprises at least one air intake positioned near the base and, during operation, capable of creating a stream of air at the base of the hood so as to prevent fine particles from being deposited on the window.

Abstract: The invention relates to a method of ablating a surface layer of a wall by sweeping the said layer, comprising: a step of directional control by an optical deflector of a plurality of pulsed laser beams; a step of ablating the layer on impact zones created by the plurality of laser beams, each impact zone being defined by a centre and by a characteristic dimension; the method is characterized in that the impact zones are disjoint, the distance between each centre of the impact zones being equal to at least ten times the largest characteristic dimension of the impact zones. The invention also relates to a corresponding device.

Abstract: The invention relates to a method characterized in that it comprises—a step (E1) of calibrating a device, whereby—a galvanometric head illuminates along two axes a calibration plate, situated at a depth, in order to illuminate a plurality of determined points of the calibration plate, while a camera observes said calibration plate, a control unit establishing a relationship between, on the one hand, the position of illumination of each of the illuminated points of the calibration plate at the depth, and, on the other hand, the position observed by the camera of the illuminated points; the calibration plate being successively positioned at a plurality of depths during the calibration step so as to allow a plurality of illuminations by the head, of observations by the camera and of relationships to he established by the control unit; the control unit establishes a correspondence relationship,—a step (E2) of determining the three-dimensional shape of the surface that is to be ablated, from the calibration step (

Abstract: The invention concerns a method for laser ablation of a surface coating from a wall, such as a painted wall finish, for example in a nuclear plant to be decontaminated, and a device for implementing said method. The inventive ablation method includes sweeping shots on the coating of at least one pulsed laser beam with a laser beam quality factor M2 less than 20, and characterized in that it comprises a direct control of said shots by optical deflection, such that the impact zones (I1, I2, I3,) of said shots on said coating are disjointed or substantially adjacent with minimized overlapping.

Abstract: The invention relates to a hood for sucking-up fine particles, including: a mouth intended to be placed close to a wall, a base having a window through which a laser beam can pass, an intermediate portion between the mouth and the base, and a suction outlet disposed on the intermediate portion of the hood and designed to suck-up fine particles. The hood is characterized in that it comprises at least one air intake positioned near the base and, during operation, capable of creating a stream of air at the base of the hood so as to prevent fine particles from being deposited on the window.

Abstract: The invention relates to a method of ablating a surface layer of a wall by sweeping the said layer, comprising: a step of directional control by an optical deflector of a plurality of pulsed laser beams; a step of ablating the layer on impact zones created by the plurality of laser beams, each impact zone being defined by a centre and by a characteristic dimension; the method is characterized in that the impact zones are disjoint, the distance between each centre of the impact zones being equal to at least ten times the largest characteristic dimension of the impact zones. The invention also relates to a corresponding device.

Abstract: The invention relates to a hood for sucking up fine particles, comprising: an air intake mouth comprising a crest intended to be placed close to a wall or to emit fine particles, the crest defining an internal portion of the hood and an external portion; and a suction outlet intended to suck up the fine particles. The hood is characterized in that the mouth further includes an external lip extending towards the suction outlet and having a leading edge located on the same side as the outlet in relation to the crest, so that, when the hood is in operation, the sucked-up air undergoes no separation at the lip and that an air separation zone is located only in the internal portion of the hood.

Abstract: The invention concerns a method for laser ablation of a surface coating from a wall, such as a painted wall finish, for example in a nuclear plant to be decontaminated, and a device for implementing said method. The inventive ablation method includes sweeping shots on the coating of at least one pulsed laser beam with a laser beam quality factor M2 less than 20, and characterized in that it comprises a direct control of said shots by optical deflection, such that the impact zones (I1, I2, I3,) of said shots on said coating are disjointed or substantially adjacent with minimized overlapping.

Abstract: A pulsed eddy current testing system for detecting defects in a part. A probe carries an exciting pulse in one coil and receives a measuring signal in a second coil. The measuring signal is sampled at two instants defined by short and long time lags. The two amplitudes obtained are plotted in a representative plane having two reference axes. The point having the signals as coordinates describes a figure eight, when the part has a defect. The size and orientation of the figure gives information on the defect in the part.