Abstract
The article considers the reconstruction of images by Synthetic Aperture Focusing Technique (SAFT). The work compares additive and multiplicative methods for processing signals received from antenna array. We have proven that the multiplicative method gives a better resolution. The study includes the estimation of beam trajectories for antenna arrays using analytical and numerical methods. We have shown that the analytical estimation method allows decreasing the image reconstruction time in case of linear antenna array implementation.
Highlights
Ultrasonic non-destructive testing is facing an increasingly relevant problem of considerable improvement of spatial resolution and bringing the dimensions of inspected region closer to the length of probing signal ultrasonic wave λ
Synthetic Aperture Focusing Technique (SAFT) becomes increasingly popular for flaw detection in fine structure materials and medical diagnostics, where it is used for the sake of improved resolution and image quality [1, 2]
SAFT is based on irradiating of a selected point of the inspected region from different directions from the inspection surface, receiving echo-signals from this point from different directions, and summing the received signals with preliminary addition of time delays to them
Summary
Ultrasonic non-destructive testing is facing an increasingly relevant problem of considerable improvement of spatial resolution and bringing the dimensions of inspected region closer to the length of probing signal ultrasonic wave λ. A SAFT processing algorithm implies coherent summation of signals of individual elements comprising the antenna array. Published under licence by IOP Publishing Ltd distribution, the increase of the signal-to-noise ratio is proportional to the number of elements in the array.
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