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Tomographie ultrasonore pour les arbres sur pied

Abstract : Ultrasonic tomography on standing trees. Ultrasonic tomography was used for the detection of degradation of transversal section of a beech, attacked by white decay. The image reconstruction of the transversal section of the tree in 2D was obtained with a software, which used the values of ultrasonic velocities measured at different heights from the ground. The attacked wood is characterised by low velocities. The measurements were performed with special transducers of 1 MHz, without damaging the bark of the tree. To improve the readings of the signals, a frequency analysis was performed. The ultrasonic tomographies were compared with the corresponding photographic images and with data obtained with a "Resistograph". A good agreement between ultrasonic tomographies and photographs was observed. The image resolution is between 4 and 5 cm. Presently, this is the best resolution ever obtained with an acoustic nondestructive method on a standing tree.
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Submitted on : Thursday, January 1, 2004 - 10:00:00 AM
Last modification on : Wednesday, November 29, 2017 - 3:16:42 PM
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Roberto Martinis, Laura Socco, Luigi Sambuelli, Giovanni Nicolotti, Olivier Schmitt, et al.. Tomographie ultrasonore pour les arbres sur pied. Annals of Forest Science, Springer Verlag/EDP Sciences, 2004, 61 (2), pp.157-162. ⟨10.1051/forest:2004007⟩. ⟨hal-00883840⟩



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