Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window
Open Access
- 8 May 2019
- Vol. 19 (9), 2138
- https://doi.org/10.3390/s19092138
Abstract
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.Keywords
Funding Information
- Spanish Ministry of Economy and Innovation (MINECO) and European Union FEDER (project FIS2015-65998-C2-1 and FIS2015-65998-C2- 2)
- US Army Research, Development and Engineering Command (RDECOM) (W911NF-16-1-0563)
This publication has 29 references indexed in Scilit:
- Multi-Wave and Hybrid Imaging Techniques: A New Direction for Nondestructive Testing and Structural Health MonitoringSensors, 2013
- Depth estimation of surface cracks on metallic components by means of lock-in thermographyReview of Scientific Instruments, 2013
- A dispersion compensation procedure to extend pulse-echo defects location to irregular waveguidesNDT & E International, 2013
- Synthetic Aperture Focusing and Time-of-Flight Diffraction Ultrasonic Imaging—Past and PresentJournal of Nondestructive Evaluation, 2012
- Two-dimensional simulation of the single-sided air-coupled ultrasonic pitch-catch technique for non-destructive testingUltrasonics, 2010
- Synthetic aperture ultrasound imagingUltrasonics, 2006
- Imaging nonlinear scatterers applying the time reversal mirrorThe Journal of the Acoustical Society of America, 2006
- Synthetic aperture focusing techniques in time and frequency domains for photoacoustic imagingInsight - Non-Destructive Testing and Condition Monitoring, 2004
- Nonlinear Acoustic Imaging: Fundamentals, Methodology, and NDE-ApplicationsAcoustical Imaging, 2004
- Time reversal techniques in ultrasonic nondestructive testing of scattering mediaInverse Problems, 2002