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Título

Longitudinal and Shear Wave Propagation in Silica Aerogels at Ultrasonic Frequencies

AutorGómez Álvarez-Arenas, Tomás
Palabras claveAerogels
Viscoelastic properties
Ultrasonic frequencies
Piezoelectric transducers
Longitudinal waves
Shear waves
Velocity of propagation
Attenuation
Fecha de publicaciónsep-2002
EditorSociedad Española de Acústica
CitaciónForum Acusticum. Sevilla, sep. 2002
ResumenIn this work, the possibility to use a technique based on the analysis of thickness resonances of air-surrounded aerogel plates at ultrasonic frequencies to obtain its viscoelastic properties is investigated. These resonances were excited and sensed by airborne ultrasonic waves. To this purpose, specially designed air-coupled, high-sensitivity and broad-band piezoelectric transducers were used. Precise and simultaneous measurements of velocity and attenuation of longitudinal and shear waves at different frequencies as well as aerogel density were obtained. It allowed to afford for the first time, a full characterisation of the viscoeleastic properties of these materials at ultrasonic frequencies.
DescripciónPACS Reference: 43.35.Cg, 43.35.Mr, 43.35.Yb, 43.20.Ks
URIhttp://hdl.handle.net/10261/4913
Aparece en las colecciones: (IA) Comunicaciones congresos
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