Zobrazeno 1 - 4
of 4
pro vyhledávání: '"Luis. G. Ullate"'
Autor:
Oscar Martínez-Graullera, Ricardo T. Higuti, Carlos J. Martín, Luis. G. Ullate, David Romero, Montserrat Parrilla, Donald O. Thompson, Dale E. Chimenti
Publikováno v:
AIP Conference Proceedings.
In this work, signal processing techniques are used to improve the quality of image based on multi‐element synthetic aperture techniques. Using several apodization functions to obtain different side lobes distribution, a polarity function and a thr
Autor:
David Romero, Oscar Martínez-Graullera, Carlos J. Martín, Luis G. Ullate, Donald O. Thompson, Dale E. Chimenti
Publikováno v:
AIP Conference Proceedings.
Field modeling is a common practice in NDE. However, it is a very time consuming task, making difficult its use in systems demanding real time response. The use of Graphics Processing Units (GPUs), which are programmable devices with a high level of
Autor:
José Luis San Emeterio, Luis G. Ullate
Publikováno v:
The Journal of the Acoustical Society of America. 92:651-662
A closed‐form expression for the impulse velocity potential of rectangular pistonlike transducers, without any far field or paraxial approximation, is presented. The classical time‐domain impulse response approach is used considering free‐field
Publikováno v:
IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 53(10)
Two-dimensional (2-D) arrays of squared matrix have maximum periodicity in their main directions; consequently, they require half wavelength (lambda/2), interelement spacing to avoid grating lobes. This condition gives rise to well-known problems der