Comparative analysis of plane-wave imaging and the total focusing method in the reconstruction of complex geometrical surfaces

The non-destructive inspection by ultrasonic immersion imaging of various objects with complex geometric surfaces can be problematic because the effects of refraction have a high impact on the path of propagating acoustic waves. In order to reconstruct an image of sufficient quality, development of...

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Bibliographic Details
Published in:Surface topography metrology and properties 2019-09, Vol.7 (3), p.35011
Main Authors: Fyleris, Tautvydas, Jasi nien, Elena
Format: Article
Language:English
Subjects:
B-mode
nondestructive testing
signal-to-noise ratio
ultrasonic imaging
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Summary:The non-destructive inspection by ultrasonic immersion imaging of various objects with complex geometric surfaces can be problematic because the effects of refraction have a high impact on the path of propagating acoustic waves. In order to reconstruct an image of sufficient quality, development of a precise surface model of the structure is necessary. In this research, two different methods (the total focusing method (TFM) and plane-wave imaging (PWI) using Delay-And-Sum(DAS) and Multiply-Delay-And-Sum (MDAS) modes) for surface-geometry reconstruction are investigated. The ability of these methods to reconstruct the boundaries of complex surfaces is also presented using probes with less than 10 Mhz center frequency where object surface angles bent radius is comparable with emission wavelength. It is demonstrated that PWI is a more effective method of making surface reconstructions than the TFM due to its simplicity and utilization of lesser computational resources to reconstruct the surfaces of larger objects.
ISSN:2051-672X
2051-672X
DOI:10.1088/2051-672X/ab383d