Minimum variance imaging in plates using guided wave mode beamforming
This paper presents improvements to ultrasonic imaging of solid plate-like structures using the minimum variance distortionless response (MVDR) beamforming processor. The primary application of this work is the nondestructive testing of plate-like components that are widely used in aerospace, marine, and civil structures. The study proposes a new set of weights, or MVDR replica vectors, that are based on the physics of the propagating Lamb modes, including the symmetric mode S0, the antisymmetric mode A0, and the shear horizontal mode SH0.