Elastic constants measurement of anisotropic Olivier wood plates using air-coupled transducers generated Lamb wave and ultrasonic bulk wave

Dahmen, Souhail; Ketata, Hajer; Ghozlen, Mohamed Hédi Ben; Hosten, Bernard

doi:10.1016/j.ultras.2009.10.014

Cited by 65 publications

(34 citation statements)

References 17 publications

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“…Only a few studies were found which had investigating guided waves in timber 113,114 or logs. [115][116][117][118] There have been several other papers that have described guided wave phenomena, though have not specifically referred to them as being due to guided wave effects.…”

Section: Acoustic/ultrasonic Guided Waves In Tree Stemsmentioning

confidence: 99%

Measurement of stiffness of standing trees and felled logs using acoustics: A review

Legg

Bradley

2016

The Journal of the Acoustical Society of America

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This paper provides a review on the use of acoustics to measure stiffness of standing trees, stems, and logs. An outline is given of the properties of wood and how these are related to stiffness and acoustic velocity throughout the tree. Factors are described that influence the speed of sound in wood, including the different types of acoustic waves which propagate in tree stems and lumber. Acoustic tools and techniques that have been used to measure the stiffness of wood are reviewed. The reasons for a systematic difference between direct and acoustic measurements of stiffness for standing trees, and methods for correction, are discussed. Other techniques, which have been used in addition to acoustics to try to improve stiffness measurements, are also briefly described. Also reviewed are studies which have used acoustic tools to investigate factors that influence the stiffness of trees. These factors include different silvicultural practices, geographic and environmental conditions, and genetics.

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Section: Acoustic/ultrasonic Guided Waves In Tree Stemsmentioning

confidence: 99%

Measurement of stiffness of standing trees and felled logs using acoustics: A review

Legg

Bradley

2016

The Journal of the Acoustical Society of America

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“…non et al 2008). ACU has previously been used to assess solid wood boards, particleboard, fiber composites, veneer and glued timber boards (Fagus GreCon Greten GmbH & Co. KG 1994;Blum 1997;Benedetti 2003;Stöessel 2004;Gan et al 2005;Hasenstab 2006;Hyvärinen 2007;Vun et al 2008;Blomme et al 2010;Dahmen et al 2010;Hsu et al 2010;Sanabria et al 2010b). To the best of our knowledge, there is no current ACU application for the inspection of glulam.…”

Section: Introductionmentioning

confidence: 99%

Air-coupled ultrasound inspection of glued laminated timber

et al. 2011

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A novel air-coupled ultrasound (ACU) 120 kHz normal transmission system enabled successful imaging of bonding and saw cut defects in multilayered glulam beams up to 280 mm in height with a signal-to-noise ratio (SNR) of 40 dB. The main wave propagation paths were modeled; quasi-longitudinal and quasi-transverse modes were coupled in each lamella and the sound field was found to be shifted from the insonification axis as a function of the ring angle, leading to interference of wave paths in the receiver and to 15 dB amplitude variability in defect-free glulam. The assessment was improved with spatial processing algorithms that profited from the arbitrary scanning resolution and high reproducibility of ACU. Overlapped averaging reduced inband noise by 15 dB, amplitude tracking captured only the first incoming oscillation, thus minimizing diffraction around defect regions, and image normalization compensated 6 dB of systematic amplitude variability across the fiber direction. The application of ACU to in situ defect monitoring was demonstrated by using multiparameter difference imaging of measurements of the same sample with and without saw cut defects. The segmentation of the defect geometry was improved significantly and the amplitude variability was reduced by 10 dB. Further work is planned to model additional insonification setups and grain and density heterogeneities.

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“…The development of nondestructive inspection systems for chemical retention in fire-retardant treated wood has thus attracted considerable attention in the context of wood industries. Recently, air-coupled ultrasonic waves have been studied for use in the quality control of wood and wood-based composites (Vun et al 2008;Dahmen et al 2010;Hsu et al 2010;Sanabria et al 2011;Sanabria et al 2013;Mori et al 2016). This technique makes it possible to evaluate the current state of a wood sample without contact and without destroying the wood.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Chemical Retention and Velocity of Air-Coupled Ultrasonic Waves in Fire-Retardant-Treated Wood

et al. 2017

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The ultrasonic wave velocities in wood impregnated with a fire-retardant chemical were measured via a non-contact method. An air-coupled ultrasonic wave was made to propagate along the radial direction of the wood. The wave velocities in the wood samples after chemical impregnation were larger than those before impregnation. With increased chemical concentration, the relative changes in the velocities increased to a maximum of 16.3%, and these velocity changes exhibited a strong correlation with the chemical retention. These findings suggest that it is possible to evaluate the uniformity distributions of chemicals in fireretardant-treated wood via a non-contact and nondestructive method based on air-coupled ultrasonics.

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Elastic constants measurement of anisotropic Olivier wood plates using air-coupled transducers generated Lamb wave and ultrasonic bulk wave

Cited by 65 publications

References 17 publications

Measurement of stiffness of standing trees and felled logs using acoustics: A review

Measurement of stiffness of standing trees and felled logs using acoustics: A review

Air-coupled ultrasound inspection of glued laminated timber

Relationship between Chemical Retention and Velocity of Air-Coupled Ultrasonic Waves in Fire-Retardant-Treated Wood

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