Multi-layer ultrasonic imaging for non-destructive testing applications

Moallemi, Nasim; Shahbazpanahi, Shahram

doi:10.1109/ultsym.2014.0014

Cited by 1 publication

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the computational complexities of these numerical techniques are not easily quantifiable, one can say that to ensure an accurate approximation of the aforementioned integral, number of points in the corresponding numerical approximation has to be to sufficiently large and this results in a very high computational complexity for the algorithms of [26]. Our proposed scheme trades off imaging performance to gain computational advantage over the methods of [26], see [30] for more details.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

A Novel Spatio-Temporal Frequency-Domain Imaging Technique for Two-Layer Materials Using Ultrasonic Arrays

Moallemi

Shahbazpanahi

2018

IEEE Access

Self Cite

View full text Add to dashboard Cite

Ultrasonic imaging of multi-layer materials with parallel interfaces is a challenging problem in non-destructive testing. In multi-layer materials, since the sound velocity and the propagation path change when sound travels from one layer into another, calculating the sound travel time is complicated. In this paper, we develop a frequency-domain imaging algorithm for estimating the scattering coefficients of all the points inside the second layer of a two-layer (liquid-solid) medium in order to obtain an image of the region of interest. To do so, we first introduce our data model for the array received signals by modeling the interfaces between the layers of a two-layer medium as a spatially distributed source. Then, we introduce a mapping relationship between the two-dimensional image of the region of interest and the three-dimensional Fourier transform of the received signals. This proposed algorithm has relatively lower computational complexity and it can be used for online imaging. Computer simulations as well as experimental data show the accuracy of the proposed algorithm.INDEX TERMS Distributed source, array signal processing, non-destructive testing, immersion ultrasonic imaging, multi-layer imaging.

show abstract

Section: Simulation and Experimental Resultsmentioning

confidence: 99%