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Ultrasonic Imaging in Solids Using Wave Mode Beamforming
Author(s) -
Francesco Lanza di Scalea,
Simone Sternini,
Thompson Vu Nguyen
Publication year - 2017
Publication title -
ieee transactions on ultrasonics, ferroelectrics, and frequency control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.159
H-Index - 136
eISSN - 1525-8955
pISSN - 0885-3010
DOI - 10.1109/tuffc.2016.2637299
Subject(s) - fields, waves and electromagnetics
This paper discusses some improvements to ultrasonic synthetic imaging in solids with primary applications to nondestructive testing of materials and structures. Specifically, the study proposes new adaptive weights applied to the beamforming array that are based on the physics of the propagating waves, specifically the displacement structure of the propagating longitudinal (L) mode and shear (S) mode that are naturally coexisting in a solid. The wave mode structures can be combined with the wave geometrical spreading to better filter the array (in a matched filter approach) and improve its focusing ability compared to static array weights. This paper also proposes compounding, or summing, images obtained from the different wave modes to further improve the array gain without increasing its physical aperture. The wave mode compounding can be performed either incoherently or coherently, in analogy with compounding multiple frequencies or multiple excitations. Numerical simulations and experimental testing demonstrate the potential improvements obtainable by the wave structure adaptive weights compared to either static weights in conventional delay-and-sum focusing, or adaptive weights based on geometrical spreading alone in minimum-variance distortionless response focusing.

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