Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/409
Type: Artigo de periódico
Title: Computational Method to Determine Reflected Ultrasonic Signals From Arbitrary-Geometry Targets
Author: BUIOCHI, Flavio
BUIOCHI, Elaine B.
FORMIGONI, Paulo O.
ADAMOWSKI, Julio C.
Abstract: A computational method based on the impulse response and on the discrete representation computational concept is proposed for the determination of the echo responses from arbitrary-geometry targets. It is supposed that each point of the transducer aperture can be considered as a source radiating hemispherical waves to the reflector. The local interaction with each of the hemispherical waves at the reflector surface can be modeled as a plane wave impinging on a planar surface, using the respective reflection coefficient. The method is valid for all field regions and can be performed for any excitation waveform radiated from an arbitrary acoustic aperture. The effects of target geometry, position, and material on both the amplitude and the shape of the echo response are studied. The model is compared with experimental results obtained using broadband transducers together with plane and cylindrical concave rectangular reflectors (aluminum, brass, and acrylic), as well as a circular cavity placed on a plane surface, in a water medium. The method can predict the measured echoes accurately. This paper shows an improved approach of the method, considering the reflection coefficient for all incident hemispherical waves arriving at each point of the target surface.
Country: Estados Unidos
Editor: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, v.57, n.4, p.986-994, 2010
Rights: fechado
Identifier DOI: 10.1109/TUFFC.2010.1504
Address: http://dx.doi.org/10.1109/TUFFC.2010.1504
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Date Issue: 2010
Appears in Collections:CEB - Artigos e Outros Documentos

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