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Título : Piezoelectric transducers for air-coupled operation in the frequency range 0.3-2.5 MHz
Autor : Gómez Álvarez-Arenas, Tomás; Montero de Espinosa Freijo, Francisco
Palabras clave : Acoustic vibrations
Non-contact techniques
Air-coupled ultrasound
Megahertz frequency range
Nondestructive Examination (NDE)
NDE scanning
Piezoelectric transducers
Fecha de publicación : sep-2002
Editor: Sociedad Española de Acústica
Citación : Forum Acusticum Sevilla 2002. Ultrasonics ; ULT-04-004-IP
Resumen: Use of non-contact techniques to produce and sense acoustic vibrations in the megaherzt frequency range are increasing. Higher frequencies provide higher spatial resolution while non-contact operation is an important improvement for rapid NDE scanning, analysis of materials that can not be wetted or touched, "in-situ" NDE appplications, etc. The approach we present in this paper is based on the use of piezoelectric transducers for both signal generation and reception. It is based on the use of a stack of quarter-wavelength matching layers to improve both the efficiency and the frequency band. To this end it is extremely important to find materials having: very low attenuation, very low acoustic impedance and the thickness requiered for the working frequency of the transducer. Piezoceramics and 1-3 connectivity piezocomposites are studied and compared. Plane and focused transducers are presented.
Descripción : 6 pages, 4 figures.-- PACS nrs.: 43.38.Ar, 43.38.Fx.-- Communication presented at: Forum Acusticum Sevilla 2002 (Sevilla, Spain, 16-20 Sep 2002), comprising: 3rd European Congress on Acoustics; XXXIII Spanish Congress on Acoustics (TecniAcústica 2002); European and Japanese Symposium on Acoustics; 3rd Iberian Congress on Acoustics.-- Special issue of the journal Revista de Acústica, Vol. XXXIII, year 2002.
URI : http://hdl.handle.net/10261/7996
ISBN : 84-87985-07-6
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