Sparse wavefield reconstruction and source detection using Compressed Sensing

Abstract

The paper presents a Compressed Sensing technique for the reconstruction of guided wavefields. Structural inspections based on the analysis of guided wavefields have proven to be effective at detecting and characterizing damage. However, wavefield detection is often a time consuming process, which limits practicality. The proposed reconstruction technique estimates the location of sources and structural features interacting with the waves from a set of sparse measurements. Such features include damage, described as a scattering source. The wavefield is reconstructed by employing information on the dispersion properties of the medium under consideration. The procedure is illustrated through a one-dimensional analytical example, and subsequently applied to the reconstruction of an experimental wavefield in a composite panel with an artificial delamination. The results confirm the ability of the technique to identify the defect, while reconstructing the wavefield with good accuracy using a significantly reduced number of measurements.

Ultrasonic wavefield imaging: Research tool or emerging NDE method?

“…Using a laser source for wave generation and a piezoelectric transducer for a receiver can also reduce the need for signal averaging and thus reduce scan times [34], but laser safety issues typically preclude this option. Recent research and development efforts are addressing this issue by considering continuous wave excitations [35,36], sparse sampling and reconstruction [37], and multi-point laser vibrometry [38].…”

Compressed Sensing Techniques for Ultrasonic Imaging of Cargo Containers

“…To fulfill the RIP, the sensing matrix Φ is generally a binary random matrix [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. In this situation, N sub out of N positions arranged in a Nx × Nf matrix are selected.…”

Non-contact and non-destructive Lamb wave generation using laser-induced plasma shock wave

“…Numerous studies on Lamb wave applications to detect damage in large structures such as airplanes, factories, and ships are underway. Lamb wave generation techniques can be divided into two main categories: those using a contact-type device (e.g., piezoelectric zirconate titanate) [8][9][10][11][12][13][14][15][16][17][18][19][20][21] and those using a non-contact type device [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] . Damage detection using a contact-type device seems inefficient, but inserting the device into a target structure can improve the efficiency.…”