Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 15 April 2019 / Approved: 16 April 2019 / Online: 16 April 2019 (10:41:54 CEST)

A peer-reviewed article of this Preprint also exists.

Selim, H.; Trull, J.; Delgado Prieto, M.; Picó, R.; Romeral, L.; Cojocaru, C. Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window. Sensors 2019, 19, 2138. Selim, H.; Trull, J.; Delgado Prieto, M.; Picó, R.; Romeral, L.; Cojocaru, C. Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window. Sensors 2019, 19, 2138.

Journal reference: Sensors 2019, 19, 2138
DOI: 10.3390/s19092138

Abstract

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.

Subject Areas

laser ultrasonics; non-contact transducers; defects; NDT; SAFT; synthetic aperture; apodization; weighting function; 3D reconstruction

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