Ultrasonic imaging in highly attenuating materials with Walsh-Hadamard codes and the decomposition of the time reversal operator

E.L. Villaverde (1) , S. Robert (1) , C. Prada (2)

1 DISC (CEA, LIST) - Département Imagerie et Simulation pour le Contrôle (CEA, LIST)
2 ESPCI Paris - Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris

In this work, the total focusing method is used to image defects in a high density polyethylene pipe. The viscoelastic attenuation of this material corrupts the images with a high electronic noise. To improve the image quality, the decomposition of the time reversal operator method is combined with spatial Walsh-Hadamard coded transmissions before calculating the images.

Mots clés: Block codes; Characterization; Defects; Imaging systems; Nondestructive examination; Ultrasonic imaging; Coded transmission; Decomposition of the time reversal operator; Defect characterization; Electronic noise; High density polyethylene pipes; Non destructive testing; Time reversal; Walsh-Hadamard code; Ultrasonic testing

Domaines: Physique [physics]

E.L. Villaverde, S. Robert, C. Prada. Ultrasonic imaging in highly attenuating materials with Walsh-Hadamard codes and the decomposition of the time reversal operator. IEEE International Ultrasonics Symposium, IUS, 2016, Tours, France. ⟨10.1109/ULTSYM.2016.7728744⟩. ⟨cea-01811903⟩