Defect reconstruction by non-destructive testing with laser induced ultrasonic detection

Hossam Selim; Miguel Delgado-Prieto; Jose Trull; Rubén Picó; Luis Romeral; Crina Cojocaru

doi:10.1016/j.ultras.2019.106000

Defect reconstruction by non-destructive testing with laser induced ultrasonic detection

Ultrasonics. 2020 Feb:101:106000. doi: 10.1016/j.ultras.2019.106000. Epub 2019 Aug 31.

Authors

Hossam Selim¹, Miguel Delgado-Prieto², Jose Trull³, Rubén Picó⁴, Luis Romeral⁵, Crina Cojocaru⁶

Affiliations

¹ Physics Department, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona, Spain. Electronic address: hossam.eldin.mohamed.selim@upc.edu.
² Electronic Engineering Department, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona, Spain. Electronic address: miguel.delgado@upc.edu.
³ Physics Department, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona, Spain. Electronic address: jose.francisco.trull@upc.edu.
⁴ Instituto de Investigación para la Gestión Integrada de Zonas Costeras, Universitat Politècnica de València, Paranimf 1, Grao de Gandia, 46730 València, Spain. Electronic address: rpico@fis.upv.es.
⁵ Electronic Engineering Department, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona, Spain. Electronic address: luis.romeral@upc.edu.
⁶ Physics Department, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Barcelona, Spain. Electronic address: crina.maria.cojocaru@upc.edu.

PMID: 31505327
DOI: 10.1016/j.ultras.2019.106000

Abstract

This work envisages a detailed study of two-dimensional defect localization and reconstruction, using laser generated ultrasound and its application as a remotely controlled non-destructive testing method. As an alternative to full ultrasonic or full optical approaches, we propose a hybrid configuration where ultrasound is generated by impact of laser pulses, while the detection is done with conventional transducers. We implement this approach for defect reconstruction in metallic elements and show that it combines advantages of both photonic and ultrasonic devices, reducing the drawbacks of both methods. We combine our experimental results with a high-resolution signal processing procedure based on the synthetic aperture focusing technique for the benefit of the final two-dimensional visualization of the defects.

Keywords: 2D Apodization; B-scan; Defect reconstruction; Laser ultrasonics; NDT; Non-destructive testing; SAFT; Synthetic aperture focusing technique.