Shear waves in vegetal tissues at ultrasonic frequencies

Shear waves are investigated in leaves of two plant species using air-coupled ultrasound. Magnitude and phase spectra of the transmission coefficient around the first two orders of the thickness resonances (normal and oblique incidence) have been measured. A bilayer acoustic model for plant leaves (...

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Bibliographic Details
Published in:Applied physics letters 2013-03, Vol.102 (10)
Main Authors: Fariñas, M. D., Sancho-Knapik, D., Peguero-Pina, J. J., Gil-Pelegrín, E., Gómez Álvarez-Arenas, T. E.
Format: Article
Language:English
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Summary:Shear waves are investigated in leaves of two plant species using air-coupled ultrasound. Magnitude and phase spectra of the transmission coefficient around the first two orders of the thickness resonances (normal and oblique incidence) have been measured. A bilayer acoustic model for plant leaves (comprising the palisade parenchyma and the spongy mesophyll) is proposed to extract, from measured spectra, properties of these tissues like: velocity and attenuation of longitudinal and shear waves and hence Young modulus, rigidity modulus, and Poisson's ratio. Elastic moduli values are typical of cellular solids and both, shear and longitudinal waves exhibit classical viscoelastic losses. Influence of leaf water content is also analyzed.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4795785