Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
ANGULAR MEASUREMENT OF ACOUSTIC REFLECTION COEFFICIENT FOR SUBSTRATE MATERIALS AND LAYERED STRUCTURES BY V(Z) TECHNIQUE
Autore:
XU WJ; OURAK M;
Indirizzi:
UNIV VALENCIENNES,INST ELECT & MICROELECT NORD,DEPT OAE,UMR CNRS 9929,BP 311 F-59304 VALENCIENNES FRANCE
Titolo Testata:
NDT & E international
fascicolo: 2, volume: 30, anno: 1997,
pagine: 75 - 83
SICI:
0963-8695(1997)30:2<75:AMOARC>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROSCOPE;
Keywords:
MULTILAYERED STRUCTURES; REFLECTION COEFFICIENT; ACOUSTIC MATERIAL SIGNATURE V(Z);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
W.J. Xu e M. Ourak, "ANGULAR MEASUREMENT OF ACOUSTIC REFLECTION COEFFICIENT FOR SUBSTRATE MATERIALS AND LAYERED STRUCTURES BY V(Z) TECHNIQUE", NDT & E international, 30(2), 1997, pp. 75-83

Abstract

An experimental method to evaluate the acoustic reflection coefficient as a function of the incident angle R(theta) for substrate materialsor layered structures is presented. By measuring the acoustic material signature V(z) using a highly focused acoustic lens or transducer atnormal incidence, the reflection coefficient R(theta)) can be reconstructed from the FFT of the complex V(z) signal (amplitude and phase ofthe echo). This technique has a great simplicity for the experimentalprocedure of R(theta) measurement. It overcomes the disadvantages of the conventional method where the finite-aperture plane beam reduces the angular precision and causes the unexpected non-specular reflectionat critical incident angles. Results are given for different substrate materials, single plates and a three-layered bonded joint, and are compared to theoretical predictions. (C) 1997 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 13:51:32