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Laurent Legrandjacques

Christophe F Dehan

Francois Le Poutre

Jean-Claude Krapez

A heating zone ( ) and a detection zone ( ) at the surface ( ) of a part ( ) are displaced in such a way as to carry out the scanning of the surface ( ) and a flux radiated in the detection zone ( ) is detected by using a line of detectors ( ) which is chosen from a matrix of detectors ( ). The method makes is possible in particular to reduce the time for scanning the surface ( ) of the part and to be able to adjust the offset, in the direction of displacement ( ), between the heating zone ( ) and the detection ( ), simply by choosing the line ( ) of the matrix of detectors ( ). The method and the device in accordance with the invention make it possible in particular to carry out thermographic inspections of parts made of any materials and in particular of metal parts which may have considerable dimensions and complex shapes.

Method and device for the inspection of a material by thermal imaging

The scanning of a surface of a part is carried out by a means of imparting heat to at least one heating zone at the surface of the part. This occurs by relative displacement of the part and of the means of imparting heat. A detector is used to sense the flux radiated by the surface of the part in a detection zone displaced synchronously with the movement of the heating zone. The detector delivers, for each of the positions of a set of successive positions of the detection zone, a signal representative of the flux radiated. The scanning of the surface of the part is carried out along a determined path, in a first direction, then in a second opposite direction. For each of the successive positions of the detection zone, a differential signal is formulated.

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Dijon, France

Laurent Legrandjacques