CA2461506A1 - Device and method for detecting defects in a wood or wood-based product from its acoustic signature - Google Patents

Device and method for detecting defects in a wood or wood-based product from its acoustic signature Download PDF

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Publication number
CA2461506A1
CA2461506A1 CA002461506A CA2461506A CA2461506A1 CA 2461506 A1 CA2461506 A1 CA 2461506A1 CA 002461506 A CA002461506 A CA 002461506A CA 2461506 A CA2461506 A CA 2461506A CA 2461506 A1 CA2461506 A1 CA 2461506A1
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CA
Canada
Prior art keywords
brushes
detecting faults
excitation
detecting
detection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002461506A
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French (fr)
Other versions
CA2461506C (en
Inventor
Richard Kronland-Martinet
Henri Bailleres
Philippe Guillemain
Gilles Calchera
Loic Brancheriau
Jean-Denis Lanvin
David Grenier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CENTRE TECHNIQUE DU BOIS ET DE L'AMEUBLEMENT
Centre National de la Recherche Scientifique CNRS
Centre de Cooperation Internationalel en Recherche Agronomique pour le Development CIRAD
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of CA2461506A1 publication Critical patent/CA2461506A1/en
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Publication of CA2461506C publication Critical patent/CA2461506C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/46—Wood
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/01—Indexing codes associated with the measuring variable
    • G01N2291/015—Attenuation, scattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0238—Wood

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

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,...). Device and method for detecting faults (1) in an object (2) comprising means of local excitation of the surface (3) of the object (2) comprising at less a rubbing element (4), means for detecting the response vibration of the object (2) and means for processing the detected signal. The rubbing elements (4) advantageously include brushes. The means of detection include microphones (7), placed near the brushes or accelerometers (7), coupled to said brushes. The means of processing the signal include an acquisition card (8) and a computer (10). of the scrolling means (11) advance the object (2) at constant speed by with respect to the excitation and detection means, or vice versa. These measures and this method can advantageously be used for a control non-destructive manufacturing of assembled solid wood parts and products based on wood (squares, panels, ...) in order to quickly detect faults (delaminations, blowing, ...).

Claims (9)

1. Dispositif de détection de défauts dans un objet comprenant:
- des moyens d'excitation locale de la surface (3) de l'objet (2), - des moyens de détection de la réponse vibratoire de l'objet (2), - des moyens de traitement du signal vibratoire mesuré, caractérisé en ce que les moyens d'excitation locale de la surface (3) de l'objet (2) comportent au moins un élément frottant (4) et en ce que les réponses acoustiques de l'objet (2) sont comprises entre 30 Hz et 20.000 Hz. 1. Device for detecting faults in an object comprising:
- means of local excitation of the surface (3) of the object (2) - means for detecting the vibrational response of the object (2) means for processing the measured vibration signal, characterized in that the means for local excitation of the surface (3) of the object (2) comprise at least one rubbing element (4) and what the acoustic responses of the object (2) are understood between 30 Hz and 20,000 Hz. 2. Dispositif de détection de défauts selon la revendication 1, caractérisé en ce que les éléments frottants (4) comportent des brosses. 2. Defect detection device according to claim 1, characterized in that the friction elements (4) include brushes. 3. Dispositif de détection de défauts selon la revendication 2, caractérisé en ce que la longueur et l'épaisseur des poils (5) de la brosse sont adaptées pour rapprocher leur fréquence de résonance de la fréquence de résonance caractéristique des défauts (1). 3. Defect detection device according to claim 2, characterized in that the length and thickness of the bristles (5) of the brush are adapted to bring their frequency closer to resonance of the resonant frequency characteristic of faults (1). 4. Dispositif de détection de défauts selon l'une quelconque des revendications 1 et 3, caractérisé en ce que les moyens de détection comportent des capteurs de vibrations(7), placés à
proximité des éléments frottants (4). 4. Device for detecting faults according to any one claims 1 and 3, characterized in that the means for detection include vibration sensors (7), placed at proximity of the friction elements (4). 5. Dispositif de détection de défauts selon la revendication 4, caractérisé en ce que les éléments frottants (4) sont des brosses et que les moyens de détection comportent des capteurs de vibrations (7), couplés aux brosses. 5. Defect detection device according to claim 4, characterized in that the friction elements (4) are brushes and the detection means include sensors vibrations (7), coupled to the brushes. 6. Dispositif de détection de défauts selon l'une quelconque des revendications 1 à 5, caractérisé en ce que des, moyens de défilement produisent un mouvement relatif de l'objet à vitesse contrôlée par rapport aux moyens d'excitation et de détéction. 6. Device for detecting faults according to any one claims 1 to 5, characterized in that means for scrolling produce relative movement of object at speed controlled in relation to the means of excitation and detection. 7. Dispositif de détection de défauts selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il comporte plusieurs éléments frottants (4) qui sont décalés les uns par rapport aux autres dans l'axe d'avancement de l'objet (2) testé. 7. Device for detecting faults according to any one claims 1 to 6, characterized in that it comprises several friction elements (4) which are offset by one compared to others in the advancement axis of the object (2) tested. 8. Méthode de détection de défauts dans un objet, dans laquelle - on excite localement la surface (3) d'un objet (2), - on détecte la réponse vibratoire de l'objet (2), - on traite le signal détecté, caractérisée en ce que:
- on utilise au moins un élément frottant (4) pour exciter la surface (3) de l'objet (2) testé, - on traite numériquement et en temps réel le signal détecté
sur un ordinateur (10), - on fait défiler à vitesse contrôlée l'objet (2) testé par rapport aux moyens d'excitation et de détection. 8. Method for detecting faults in an object, in which - the surface (3) of an object (2) is locally excited, - the vibrational response of the object (2) is detected, - the detected signal is processed, characterized in that:
- at least one rubbing element (4) is used to excite the surface (3) of the object (2) tested, - the detected signal is digitally processed in real time on a computer (10), - the object (2) tested by in relation to the means of excitation and detection. 9. Méthode de détection de défauts selon la revendication 9, caractérisée en ce qu'on définit avant de tester un ensemble d'objets (2) de méme type, la signature vibratoire caractéristique (14) d'un desdits objets (2) ne présentant pas de défauts (1), on compare ensuite le signal vibratoire mesuré (15) pour chacun des objets (2) de l'ensemble à ladite signature (14). 9. Method for detecting faults according to claim 9, characterized in that one defines before testing a set objects (2) of the same type, the characteristic vibratory signature (14) of one of said objects (2) having no defects (1), we then compare the measured vibration signal (15) for each of the objects (2) of the assembly at said signature (14).
CA2461506A 2001-09-25 2002-09-25 Device and method for detecting defects in a wood or wood-based product from its acoustic signature Expired - Fee Related CA2461506C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR01/12338 2001-09-25
FR0112338A FR2830082B1 (en) 2001-09-25 2001-09-25 DEVICE AND METHOD FOR DETECTING DEFECTS IN A WOODEN OR WOOD-BASED PRODUCT FROM ITS ACOUSTIC SIGNATURE
PCT/FR2002/003272 WO2003027670A1 (en) 2001-09-25 2002-09-25 Device and method for detecting defects in a wood or wood-based product from its acoustic signature

Publications (2)

Publication Number Publication Date
CA2461506A1 true CA2461506A1 (en) 2003-04-03
CA2461506C CA2461506C (en) 2012-11-13

Family

ID=8867598

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2461506A Expired - Fee Related CA2461506C (en) 2001-09-25 2002-09-25 Device and method for detecting defects in a wood or wood-based product from its acoustic signature

Country Status (4)

Country Link
EP (1) EP1432982A1 (en)
CA (1) CA2461506C (en)
FR (1) FR2830082B1 (en)
WO (1) WO2003027670A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005016738B4 (en) * 2005-04-11 2010-01-07 Minda Industrieanlagen Gmbh Method and device for non-destructive testing of wood components
FR2932268B1 (en) * 2008-06-06 2017-11-17 Cryospace Air Liquide Aerospatiale METHOD AND INSTALLATION FOR NON-DESTRUCTIVE CONTROL OF THE ADHESION OF A GLUE COATING ON A SUPPORT
CN109738524B (en) * 2019-01-30 2021-07-30 南京林业大学 System for evaluating internal quality of broad-leaved wood log and application

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4854172A (en) * 1988-09-22 1989-08-08 Regents Of The University Of California Method and apparatus for measurement of density profiles in wood composites, using acoustic emission
GB8826640D0 (en) * 1988-11-15 1988-12-21 Sensotect Ltd Apparatus for determining surface roughness of material
US5691476A (en) * 1993-09-07 1997-11-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method for ultrasonic imaging and device for performing the method
GB9710719D0 (en) * 1997-05-24 1997-07-16 Ncr Int Inc A system for authenticating printed documents
US6088547A (en) * 1999-07-16 2000-07-11 Hewlett-Packard Company Automatic fuser temperature control
US6276209B1 (en) * 1999-09-30 2001-08-21 Perceptron, Inc. System and method of assessing the structural properties of wooden members using ultrasound

Also Published As

Publication number Publication date
EP1432982A1 (en) 2004-06-30
WO2003027670A1 (en) 2003-04-03
CA2461506C (en) 2012-11-13
FR2830082B1 (en) 2004-02-20
FR2830082A1 (en) 2003-03-28

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Effective date: 20180925