TOTAL FOCUSING METHOD BASED ULTRASONIC PHASED ARRAY IMAGING IN THICK STRUCTURES

Abstract Ultrasonic non-destructive testing traditionally uses a conventional monolithic transducer. An approach similar to this comprising of independent single transmissions but with reception performed by all the elements in phased array ultrasonics is known as Full Matrix Capture (FMC). The acquired data processed Total Focusing Method (TFM). Conventional FMC-TFM has limitations inspection at large depth attenuating materials due element transmission. To improve beam forming process, coherent recombination plane wave specific angles utilized transmission and same aperture used for Plane Wave Imaging (PWI). A new methodology called Angle Beam Virtual Source (ABVSFMC-TFM) proposed inspect thick such nickel base alloys. ABVSFMC method leads improved Signal Noise Ratio (SNR) compared FMC increased energy directivity during using group divergence PWI small virtual source near sample surface. In present paper, FMC-TFM, PWI-TFM ABVSFMC-TFM methods are superalloy (Alloy 617) slots various depths range 25-200 mm. Optimization incidence angle been computation CIVA software. Results obtained simulations discussed also three methods.