Title :
Influence of the quarter wave matching layers on the response of bar transducers
Author :
Cugnet, B. ; Assaad, J. ; Hladky, A.C. ; Haine, F.
Author_Institution :
Departement OAE, Univ. de Valenciennes et du Hainaut Cambresis, France
Abstract :
Matching layers are widely used today for large area transducers and medical arrays. Geometrical and mechanical characteristics of these layers are usually chosen with the help of the 1D design formalism. However, it doesn´t take into account of lateral waves propagation in the layer which could damage radiation pattern of the transducer. The Finite Element Model, with the help of the ATILA code, permits to take this kind of phenomenon into account. In this paper, the influence of mechanical and geometrical characteristics of the matching layer on appearance of lateral modes is examined. This study is concluded by the definition of a choice criterium guaranteeing no lateral mode in the bandwidth of the transducer
Keywords :
finite element analysis; piezoelectric transducers; ultrasonic transducers; 1D design; ATILA code; bandwidth; finite element model; geometrical characteristics; large-area transducer; lateral mode; mechanical characteristics; medical array; piezoelectric bar; quarter-wave matching layer; radiation pattern; ultrasonic transducer; Acoustic propagation; Acoustic transducers; Bandwidth; Bars; Biomedical acoustics; Biomedical transducers; Electric potential; Finite element methods; Impedance; Piezoelectric transducers;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.921525
