Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

François Champonnois

Christian Lascoutouna

Pierre-Yves Thro

Philippe Cormont

Yves LeCoffre

Pascal Wodling

Marie Geleoc

François Beaumont

Christophe Hubert

Bertrand Laval

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.

Hood for sucking-up fine particles, and a device intended for the laser ablation of a surface layer of a wall and including such a hood

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.

Method of ablating a surface layer of a wall, and associated device

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 Mless than 20, and characterized in that it comprises a direct control of said shots by optical deflection, such that the impact zones (I, I, I,) of said shots on said coating are disjointed or substantially adjacent with minimized overlapping.

Method and device for laser ablation of a surface coating from a wall, such as a coat of paint in a nuclear plant

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Bures sur Yvette, France

François Champonnois