Device and method for detecting defects in a wood or...

G - Physics – 01 – N

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G01N 33/46 (2006.01) G01N 29/04 (2006.01) G01N 29/14 (2006.01) G01N 29/44 (2006.01)

Patent

CA 2461506

The invention concerns a device and a method for detecting defects (1) in an object (2) comprising means for locally exciting the surface (3) of the object (2) including at least a friction element (4), means for detecting the vibratory response of the object (2) and means for processing the detected signal. The friction elements (4) advantageously comprise brushes. The detection means include microphones (7) arranged proximate to brushes or accelerometers (7), coupled with said brushes. The signal processing means comprise an acquisition card (8) and a computer (10). Displacement means (11) cause the object (2) to move at constant speed relative to the excitation and detection means, or inversely. Said device and said method can advantageously be used for non-destructive industrial control of assembled solid wooden parts and wood-based products (tiles, panels, and the like) for fast detection of defects (delamination, blisters and the like).

Dispositif et méthode de détection de défauts (1) dans un objet (2) comprenant des moyens d'excitation locale de la surface (3) de l'objet (2) comportant au moins un élément frottant (4), des moyens de détection de la réponse vibratoire de l'objet (2) et des moyens de traitement du signal détecté. Les éléments frottants (4) comportent avantageusement des brosses. Les moyens de détection comportent des microphones (7), placés à proximité des brosses ou des accéléromètres (7), couplés auxdites brosses. Les moyens de traitement du signal comportent une carte d'acquisition (8) et un ordinateur (10). Des moyens de défilement (11) font avancer l'objet (2) à vitesse constante par rapport aux moyens d'excitation et de détection, ou inversement. Ce dispositif et cette méthode peuvent avantageusement être mis en oeuvre pour un contrôle industriel non destructif de pièces de bois massives assemblées et de produits à base de bois (carrelets, panneaux,...) afin de détecter rapidement des défauts (délaminations, soufflures,...).

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