Framatome Gmbh

Compagnie Generale D'electricite

Genevieve Chabassier

Alain R Le Mehaute

Jacques Griffaton

Frederic Heliodore

Jacques Mouchart

Jean-Paul Gaffard

Jean-Michael Gabriagues

Robert Ravelet

Philippe Sautet

The optical filter device comprises a stack of thin layers exhibiting a sequences h and g which defines a fractal organization. This device makes it possible to obtain spectrum lines which are extremely fine and very well resolved.

Electromagnetic filter device

The alignment apparatus is intended for repairing welds using infrared radiation and a weldhead (30) inside a heat exchanger tube (14) in the water box (20) of a steam generator associated with a nuclear reactor. A power beam (PE, PL, PS) is transported to the axis (24) of a tube (14) to be treated via two motor-driven light deflectors referred to as an 'emitter' (11) fixed adjacent to an access hole into the water box, and as a 'receiver' (12) carried by a 'carrier' (22) at the entrance to the tube to be treated. The power beam is surrounded coaxially by a visible beam (AE, AL, AS) which is used for establishing and maintaining an optical connection between the emitter and the receiver by means of retroreflectors (15) and an autocollimation mirror (17) carried by the receiver (12) and by detectors (16, 18) carried by the emitter (11).

Apparatus and method for aligning an optical beam

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Paris, France

Genevieve Chabassier