Tomography in standing trees: revisiting the determination of acoustic wave velocity
| Autor: | Andres Arciniegas, Philippe Lasaygues, Loïc Brancheriau |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
K50 - Technologie des produits forestiers
Son (acoustique) Acoustics [SDV]Life Sciences [q-bio] Arbre 01 natural sciences Signal Bois Nondestructive testing 0103 physical sciences Méthode d'essai Particle velocity 010301 acoustics Tomography Propriété physicochimique Mathematics Ultrasonic testing 040101 forestry Ecology U10 - Informatique mathématiques et statistiques business.industry Attenuation Wave velocity Forestry 04 agricultural and veterinary sciences Propriété acoustique tomographie Vitesse Wavelength Ultrason Propriété technologique 0401 agriculture forestry and fisheries Fisher's method Ultrasonic sensor U30 - Méthodes de recherche business |
| Zdroj: | Annals of Forest Science Annals of Forest Science, Springer Nature (since 2011)/EDP Science (until 2010), 2015, 72 (6), pp.685-691. ⟨10.1007/s13595-014-0416-y⟩ |
| ISSN: | 1286-4560 1297-966X |
| DOI: | 10.1007/s13595-014-0416-y⟩ |
| Popis: | International audience; Abstract• ContextThe quality of acoustic tomographic images in standing trees is mainly function of the accuracy of the acoustic velocity computation. Improving the acoustic velocity determination is, furthermore, of great interest because acoustic tools are widely used in nondestructive testing of wood.• AimsFour different signal processing algorithms were used (1) to study the effect of the signal dynamic on the velocity determination, (2) to determine the validity range of each computation method, and (3) to compare the behavior between a homogeneous material and wood.• MethodsThe experiments were performed using the conventional experimental protocol for the ultrasonic characterization of materials in a tank (normal incidence transmission at 500 kHz). A polyurethane resin (homogeneous material) and two wood species (Bagassa guianensis Aubl., Milicia excelsa (Welw.) C.C. Berg) were used for the experiments.• ResultsComputed velocity increased as the noise level increased. The Hinkley method appeared to be the most exact when the noise level exceeded 10 dB. The Fisher method was that most suitable for very noisy signals. No difference was found between the resin and the wood samples.• ConclusionA combination of the Fisher and Hinkley methods in the same algorithm would yield the most accurate acoustic velocity determinations in the tomography of standing trees.Key messageWood acoustic velocity determination is affected by the wavelength and the detection algorithm used. The Fisher algorithm is optimal with high signal attenuation; otherwise, the Hinkley algorithm should be used. |
| Databáze: | OpenAIRE |
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