Detection, localization and characterization of damage in plates with an in situ array of spatially distributed ultrasonic sensors

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Assessment of delay-and-sum algorithms for damage detection in aluminium and composite plates (2014, methodology): “…as the magnitude of the complex analytical signal: = +r t u t v t( ) ( ) ( ) (3)ij ij ij 2 2 Following the delay-and-sum algorithm proposed by Michaels (2008) each differenced signal is delayed, squared and averaged at each spatial location: ∑ ∑= = − = + ( )E x y N r t x y( , ) 1 ( , )…”