Comparison of ultrasonic array imaging algorithms for non-destructive evaluation

2013 ◽  
Author(s):  
J. Zhang ◽  
B. W. Drinkwater ◽  
P. D. Wilcox
Keyword(s):  
Non Destructive Evaluation ◽  
Ultrasonic Array ◽  
Imaging Algorithms ◽  
Array Imaging ◽  
Non Destructive

scholarly journals Comparison of Time Domain and Frequency-Wavenumber Domain Ultrasonic Array Imaging Algorithms for Non-Destructive Evaluation

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4951 ◽  
Author(s):  
Zeyu Zhuang ◽  
Jie Zhang ◽  
Guoxuan Lian ◽  
Bruce W. Drinkwater
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Low Noise ◽  
Wavenumber Domain ◽  
Imaging Parameters ◽  
Non Destructive Evaluation ◽  
Ultrasonic Array ◽  
Imaging Algorithms ◽  
Array Imaging ◽  
Non Destructive

Ultrasonic array imaging algorithms have been widely developed and used for non-destructive evaluation (NDE) in the last two decades. In this paper two widely used time domain algorithms are compared with two emerging frequency domain algorithms in terms of imaging performance and computational speed. The time domain algorithms explored here are the total focusing method (TFM) and plane wave imaging (PWI) and the frequency domain algorithms are the wavenumber algorithm and Lu’s frequency-wavenumber domain implementation of PWI. In order to make a fair comparison, each algorithm was first investigated to choose imaging parameters leading to overall good imaging resolution and signal-to-noise-ratio. To reflect the diversity of samples encountered in NDE, the comparison is made using both a low noise material (aluminium) and a high noise material (copper). It is shown that whilst wavenumber and frequency domain PWI imaging algorithms can lead to fast imaging, they require careful selection of imaging parameters.

scholarly journals Optimizing the focal laws of ultrasonic arrays for non-destructive evaluation of composite panels with delamination

2018 ◽  
Vol 191 ◽  
pp. 00001
Author(s):  
Mariam Achbal ◽  
Abdellatif Khamlichi ◽  
Fadoua El Khannoussi
Keyword(s):  
Composite Panel ◽  
Single Element ◽  
Specific Sequence ◽  
Non Destructive Evaluation ◽  
Focal Position ◽  
Dimensional Approximation ◽  
Ultrasonic Array ◽  
Ultrasonic Arrays ◽  
Incident Waves ◽  
Non Destructive

The use of ultrasonic arrays in the field of non-destructive evaluation of composites is a recent technique. This method offers the possibility to achieve fast inspection of components having complex geometries. As compared with the single element transducers, arrays configuration yields more effective detection of defects. However, to achieve adequate imaging by ultrasonic array elements, each element should be excited according to a specific sequence which is called the focal law. At each instant a subset of the array elements is activated and the incident waves are better directed to scattered at the defect. The reflected signals can then be more intensified. In this work, two-dimensional approximation of wave propagation problem was supposed. Array elements with linear geometry and with the elements assumed to be fully coupled with the composite panel were considered. A delamination defect was inserted between the plies of the composite panel at a given depth. The forward model enabling to simulate ultrasonic array data was built by means of the FEM. As each focal position requires a different focal law that fixes a proper protocol of excitation and reception, synthesis of these focal laws was studied. Optimization of signal focalization and reception as function of the delamination extent was achieved.

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