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