A sparse reconstruction algorithm for ultrasonic images in nondestructive testing.
Giovanni Alfredo Guarneri,Daniel R. Pipa,Flávio Neves Junior,Lúcia Valéria Ramos de Arruda,Marcelo V. W. Zibetti +4 more
TLDR
In this paper, an image reconstruction algorithm based on regularized least squares using a l 1 regularization norm was proposed to reconstruct an image of a point-like reflector, using both simulated and real data.Abstract:
Ultrasound imaging systems (UIS) are essential tools in nondestructive testing (NDT). In general, the quality of images depends on two factors: system hardware features and image reconstruction algorithms. This paper presents a new image reconstruction algorithm for ultrasonic NDT. The algorithm reconstructs images from A-scan signals acquired by an ultrasonic imaging system with a monostatic transducer in pulse-echo configuration. It is based on regularized least squares using a l1 regularization norm. The method is tested to reconstruct an image of a point-like reflector, using both simulated and real data. The resolution of reconstructed image is compared with four traditional ultrasonic imaging reconstruction algorithms: B-scan, SAFT, !-k SAFT and regularized least squares (RLS). The method demonstrates significant resolution improvement when compared with B-scan—about 91% using real data. The proposed scheme also outperforms traditional algorithms in terms of signal-to-noise ratio (SNR).read more
Citations
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Journal ArticleDOI
Sizing of flaws using ultrasonic bulk wave testing: A review
Maria V. Felice,Zheng Fan +1 more
TL;DR: Techniques that utilise ultrasonic bulk waves to size flaws, including amplitude, temporal, imaging and inversion, are reviewed.
Journal ArticleDOI
Frequency Optimization for Enhancement of Surface Defect Classification Using the Eddy Current Technique
TL;DR: An investigation into optimum excitation frequency has been conducted to enhance surface defect classification performance and it is observed that probe signals are the most sensitive on the whole for a group of defects whenexcitation frequency is set near the frequency at which maximum probe signal signals are retrieved for the largest defect.
Journal ArticleDOI
An Inverse Approach for Ultrasonic Imaging From Full Matrix Capture Data: Application to Resolution Enhancement in NDT
TL;DR: A linear model is built that links the FMC data, i.e., the signals collected from all transmitter–receiver pairs of an ultrasonic array, to the discretized reflectivity map of the inspected object, which includes the ultrasonic waveform corresponding to the response of transducers.
Journal ArticleDOI
Accurate 3D reconstruction of bony surfaces using ultrasonic synthetic aperture techniques for robotic knee arthroplasty
TL;DR: The ability of a robotic deployed ultrasound imaging system based on synthetic aperture methods to accurately reconstruct bony surfaces is investigated, demonstrating the feasibility of the approach to deliver the sub-millimetre accuracy required for the application.
Journal ArticleDOI
Model-Based Iterative Reconstruction for One-Sided Ultrasonic Nondestructive Evaluation
TL;DR: This paper proposes a model-based iterative reconstruction (MBIR) algorithm designed for scanning UNDE systems and shows how it can improve over SAFT as well as existing regularized inversion techniques.
References
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