Compressed Sensing Based Ultrasonic Nondestructive Testing by the Use of Sparse Deconvolution

In ultrasonic nondestructive testing, the reflection sequence always overlapped or immersed in noisy. A sparse deconvolution was proposed to enhance significantly the resolution of the original time trace, making it possible to determine the amplitudes and the arrival times of the wave packets contained in the original time sequence. With the purpose of ensuring sparsity, Compressed sensing (CS) and Orthogonal matching pursuit (OMP) were used for pulse-echo signal reconstruction to obtain sparser distortion function for sparse deconvolution. Simulated results and experimental verification which performed on time of flight diffraction (TOFD) specimens demonstrated the proposed method.