Incidence of element distribution on the ultrasonic field of segmented annular arrays
Segmented annular arrays are sometimes used for 3D ultrasonic imaging. However, owing to their geometrical complexity, the acoustic field generated by this type of aperture has not been adequately described. In this work, a method based on the array factor approach is used to describe the field radiated by sector annular arrays. This approach allows one to analyse the influence on the field of several aperture parameters, such as the number of elements per annulus, size and spatial distribution of elements, etc. In addition, strategies to reduce grating lobes are presented.
Martinez
O
Instituto de Automatica Industrial (CSIC), Madrid, Spain. oscarm@iai.csic.es
Ullate
LG
Izquierdo
MA
Sanchez
T