scholarly journals Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2138 ◽  
Author(s):  
Hossam Selim ◽  
José Trull ◽  
Miguel Delgado Prieto ◽  
Rubén Picó ◽  
Luis Romeral ◽  
...  
Keyword(s):  
3D Reconstruction ◽  
Ultrasonic Transducer ◽  
Synthetic Aperture ◽  
3D Image ◽  
Volume Data ◽  
Ultrasound Waves ◽  
Qualitative And Quantitative ◽  
Reconstruction Image ◽  
Filtering Technique ◽  
Synthetic Aperture Focusing

Nondestructive testing of metallic objects that may contain embedded defects of different sizes is an important application in many industrial branches for quality control. Most of these techniques allow defect detection and its approximate localization, but few methods give enough information for its 3D reconstruction. Here we present a hybrid laser–transducer system that combines remote, laser-generated ultrasound excitation and noncontact ultrasonic transducer detection. This fully noncontact method allows access to scan areas on different object’s faces and defect details from different angles/perspectives. This hybrid system can analyze the object’s volume data and allows a 3D reconstruction image of the embedded defects. As a novelty for signal processing improvement, we use a 2D apodization window filtering technique, applied along with the synthetic aperture focusing algorithm, to remove the undesired effects due to side lobes and wide-angle reflections of propagating ultrasound waves, thus enhancing the resulting 3D image of the defect. Finally, we provide both qualitative and quantitative volumetric results that yield valuable information about defect location and size.

scholarly journals Fully Non-Contact Hybrid NDT Inspection for 3D Defect Reconstruction Using an Improved SAFT Algorithm

2019 ◽  
Author(s):  
Hossam Selim ◽  
José Trull ◽  
Miguel Delgado Prieto ◽  
Rubén Picó ◽  
Luis Romeral ◽  
...  
Keyword(s):  
3D Reconstruction ◽  
Ultrasonic Transducer ◽  
Contact Method ◽  
Volume Data ◽  
Destructive Testing ◽  
Ultrasound Waves ◽  
Reconstruction Image ◽  
Filtering Technique ◽  
Synthetic Aperture Focusing ◽  
Non Destructive

Non-destructive testing of metallic objects that may contain embedded defects of different sizes is an important application in many industrial branches for quality control. Most of these techniques allow defect detection and its approximate localization, but very few give enough information for its 3D reconstruction. Here we present a hybrid laser – transducer system that combines remote laser-generated ultrasound excitation and non-contact ultrasonic transducer detection. This fully non-contact method gives access to separating scan areas on different object’s faces and defect details from different angles/perspectives can be analysed. This hybrid system can analyse the whole object’s volume data and allow a 3D reconstruction image of the embedded defects. As a novelty for the signal processing improvement, we use a 2D apodization window filtering technique, applied along with the synthetic aperture focusing algorithm in order to remove the undesired effects of side lobes and wide-angle reflections of propagating ultrasound waves, thus, enhancing the resulting 3D image of the defect. We provide both qualitative and quantitative volumetric results with high accuracy and resolution compared with conventional techniques.

scholarly journals Toward Real-Time Giga-Voxel Optoacoustic/Photoacoustic Microscopy: GPU-Accelerated Fourier Reconstruction with Quasi-3D Implementation

Photonics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 15
Author(s):  
Pavel Subochev ◽  
Florentin Spadin ◽  
Valeriya Perekatova ◽  
Aleksandr Khilov ◽  
Andrey Kovalchuk ◽  
...  
Keyword(s):  
3D Reconstruction ◽  
Empirical Model ◽  
Execution Time ◽  
Computing System ◽  
Synthetic Aperture ◽  
Photoacoustic Microscopy ◽  
Fourier Reconstruction ◽  
Synthetic Aperture Focusing ◽  
Synthetic Aperture Focusing Technique ◽  
Reconstruction Time

We propose a GPU-accelerated implementation of frequency-domain synthetic aperture focusing technique (SAFT) employing truncated regularized inverse k-space interpolation. Our implementation achieves sub-1s reconstruction time for data sizes of up to 100 M voxels, providing more than a tenfold decrease in reconstruction time as compared to CPU-based SAFT. We provide an empirical model that can be used to predict the execution time of quasi-3D reconstruction for any data size given the specifications of the computing system.

ULTRASONIC IMAGING SYSTEM USING A 2D ENVELOPE BEAMFORMING TECHNIQUE: IN-HOMOGENEITIES LOCATION

2004 ◽  
Vol 12 (04) ◽  
pp. 571-585
Author(s):  
L. MEDINA ◽  
E. MORENO
Keyword(s):  
Imaging System ◽  
Side Lobe ◽  
Ultrasonic Pulse ◽  
Image Resolution ◽  
Synthetic Aperture ◽  
Water Tank ◽  
Synthetic Aperture Focusing ◽  
Longitudinal Resolution ◽  
Synthetic Aperture Focusing Technique ◽  
Beamforming Technique

An algorithm has been developed to implement synthetic aperture focusing technique for B-scan. This is made at a several transmitter/receiver locations to form a map of ultrasonic reflectivity on the insonified region, considering the path travelled by the ultrasonic pulse from the transducer to the target and back again. To reconstruct the image, a time domain beam-former is applied to the envelope of the detected signals. This method minimizes the side-lobe amplitude and the restriction of λ/2 distance between two adjacent transducer positions can be neglected without loosing image resolution. The present work is focused on the location of the in-homogeneities, caused by the presence of a phantom immersed in a water tank. The results are presented when the distance between two adjacent transducer positions are varied from 0.5λ to 2.5λ showing that the longitudinal resolution is not affected but the lateral resolution becomes poorer when the distance is about 2λ. The error in the longitudinal location of in-homogeneities is within the minimum detectable distance of the system, while the lateral location error is increased when the distance between any two adjacent transducer positions is larger than 1.5λ.

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