Development and evaluation of f-k migration methods for fast ultrasonic imaging in solids

L. Merabet (1) , S. Robert (1) , C. Prada (2)

1 DISC - Département Imagerie et Simulation pour le Contrôle
2 ESPCI Paris - Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris

In this paper, we present two frequency-domain algorithms for 2D imaging in solids, namely Stolt's method and Lu's method, the latter being extended to the 3D imaging with matrix arrays. First, the performances of both frequency-domain methods are evaluated in 2D imaging and compared with the time-domain plane wave imaging (PWI). Then, Lu's method and PWI are applied to 3D to image a distribution of small porosities in a steel block. 2D and 3D images calculated with the f-k methods are comparable to the PWI images in terms of contrast and spatial resolution while achieving computation times more than 25 times shorter.

Keywords: Elastic waves; Frequency domain analysis; Imaging systems; Nondestructive examination; Ultrasonic imaging; Ultrasonic testing; Frequency domain algorithm; Frequency-domain methods; Non destructive testing; Plane wave; Spatial resolution; Transducer array; Time domain analysis; Computation time; 3D f-k migration methods; Wave propagation

Domains: Physics [physics]

L. Merabet, S. Robert, C. Prada. Development and evaluation of f-k migration methods for fast ultrasonic imaging in solids. 2016 IEEE International Ultrasonics Symposium (IUS) , Sep 2016, Tours, France. ⟨10.1109/ULTSYM.2016.7728685⟩. ⟨cea-01811902⟩