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Title

Longitudinal and Shear Wave Propagation in Silica Aerogels at Ultrasonic Frequencies

AuthorsGómez Álvarez-Arenas, Tomás
KeywordsAerogels
Viscoelastic properties
Ultrasonic frequencies
Piezoelectric transducers
Longitudinal waves
Shear waves
Velocity of propagation
Attenuation
Issue DateSep-2002
PublisherSociedad Española de Acústica
CitationForum Acusticum. Sevilla, sep. 2002
AbstractIn 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.
DescriptionPACS Reference: 43.35.Cg, 43.35.Mr, 43.35.Yb, 43.20.Ks
URIhttp://hdl.handle.net/10261/4913
Appears in Collections:(IA) Comunicaciones congresos
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