Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays

Theodosia Stratoudaki, Matt Clark, Paul D. Wilcox

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

Laser ultrasonics is a technique where lasers are used for the generation and detection of ultrasound instead of conventional piezoelectric transducers. The technique is broadband, non-contact, and couplant free, suitable for large stand-off distances, inspection of components of complex geometries and hazardous environments. In this paper, array imaging is presented by obtaining the full matrix of all possible laser generation, laser detection combinations in the array (Full Matrix Capture), at the nondestructive, thermoelastic regime. An advanced imaging technique developed for conventional ultrasonic transducers, the Total Focusing Method (TFM), is adapted for laser ultrasonics and then applied to the captured data, focusing at each point of the reconstruction area. In this way, the beamforming and steering of the ultrasound is done during the post processing. A 1-D laser induced ultrasonic phased array is synthesized with significantly improved spatial resolution and defect detectability. In this study, shear waves are used for the imaging, since they are more efficiently produced than longitudinal waves in the nondestructive, thermoelastic regime. Experimental results are presented from nondestructive, laser ultrasonic inspection of aluminum samples with side drilled holes and slots at depths varying between 5 and 20mm from the surface.

LanguageEnglish
Title of host publication43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36
EditorsDale E. Chimenti, Leonard J. Bond
Place of PublicationMelville, NY
Number of pages9
Volume1806
DOIs
Publication statusPublished - 16 Feb 2017
Event43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2016 - Atlanta, United States
Duration: 17 Jul 201622 Jul 2016

Conference

Conference43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2016
CountryUnited States
CityAtlanta
Period17/07/1622/07/16

Fingerprint

phased arrays
ultrasonics
matrices
lasers
inspection
piezoelectric transducers
longitudinal waves
beamforming
slots
imaging techniques
S waves
transducers
spatial resolution
broadband
aluminum
defects
geometry

Keywords

  • laser ultrasonics
  • non-contact
  • array imaging
  • full marix capture
  • thermoelastic regime
  • total focusing method
  • shear waves

Cite this

Stratoudaki, T., Clark, M., & Wilcox, P. D. (2017). Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays. In D. E. Chimenti, & L. J. Bond (Eds.), 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36 (Vol. 1806). [020022] Melville, NY. https://doi.org/10.1063/1.4974563
Stratoudaki, Theodosia ; Clark, Matt ; Wilcox, Paul D. / Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays. 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36. editor / Dale E. Chimenti ; Leonard J. Bond. Vol. 1806 Melville, NY, 2017.
@inproceedings{c8b9d895be694c129786d727e98ce122,
title = "Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays",
abstract = "Laser ultrasonics is a technique where lasers are used for the generation and detection of ultrasound instead of conventional piezoelectric transducers. The technique is broadband, non-contact, and couplant free, suitable for large stand-off distances, inspection of components of complex geometries and hazardous environments. In this paper, array imaging is presented by obtaining the full matrix of all possible laser generation, laser detection combinations in the array (Full Matrix Capture), at the nondestructive, thermoelastic regime. An advanced imaging technique developed for conventional ultrasonic transducers, the Total Focusing Method (TFM), is adapted for laser ultrasonics and then applied to the captured data, focusing at each point of the reconstruction area. In this way, the beamforming and steering of the ultrasound is done during the post processing. A 1-D laser induced ultrasonic phased array is synthesized with significantly improved spatial resolution and defect detectability. In this study, shear waves are used for the imaging, since they are more efficiently produced than longitudinal waves in the nondestructive, thermoelastic regime. Experimental results are presented from nondestructive, laser ultrasonic inspection of aluminum samples with side drilled holes and slots at depths varying between 5 and 20mm from the surface.",
keywords = "laser ultrasonics, non-contact, array imaging, full marix capture, thermoelastic regime, total focusing method, shear waves",
author = "Theodosia Stratoudaki and Matt Clark and Wilcox, {Paul D.}",
year = "2017",
month = "2",
day = "16",
doi = "10.1063/1.4974563",
language = "English",
isbn = "9780735414747",
volume = "1806",
editor = "Chimenti, {Dale E.} and Bond, {Leonard J.}",
booktitle = "43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36",

}

Stratoudaki, T, Clark, M & Wilcox, PD 2017, Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays. in DE Chimenti & LJ Bond (eds), 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36. vol. 1806, 020022, Melville, NY, 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2016, Atlanta, United States, 17/07/16. https://doi.org/10.1063/1.4974563

Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays. / Stratoudaki, Theodosia; Clark, Matt; Wilcox, Paul D.

43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36. ed. / Dale E. Chimenti; Leonard J. Bond. Vol. 1806 Melville, NY, 2017. 020022.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

TY - GEN

T1 - Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays

AU - Stratoudaki, Theodosia

AU - Clark, Matt

AU - Wilcox, Paul D.

PY - 2017/2/16

Y1 - 2017/2/16

N2 - Laser ultrasonics is a technique where lasers are used for the generation and detection of ultrasound instead of conventional piezoelectric transducers. The technique is broadband, non-contact, and couplant free, suitable for large stand-off distances, inspection of components of complex geometries and hazardous environments. In this paper, array imaging is presented by obtaining the full matrix of all possible laser generation, laser detection combinations in the array (Full Matrix Capture), at the nondestructive, thermoelastic regime. An advanced imaging technique developed for conventional ultrasonic transducers, the Total Focusing Method (TFM), is adapted for laser ultrasonics and then applied to the captured data, focusing at each point of the reconstruction area. In this way, the beamforming and steering of the ultrasound is done during the post processing. A 1-D laser induced ultrasonic phased array is synthesized with significantly improved spatial resolution and defect detectability. In this study, shear waves are used for the imaging, since they are more efficiently produced than longitudinal waves in the nondestructive, thermoelastic regime. Experimental results are presented from nondestructive, laser ultrasonic inspection of aluminum samples with side drilled holes and slots at depths varying between 5 and 20mm from the surface.

AB - Laser ultrasonics is a technique where lasers are used for the generation and detection of ultrasound instead of conventional piezoelectric transducers. The technique is broadband, non-contact, and couplant free, suitable for large stand-off distances, inspection of components of complex geometries and hazardous environments. In this paper, array imaging is presented by obtaining the full matrix of all possible laser generation, laser detection combinations in the array (Full Matrix Capture), at the nondestructive, thermoelastic regime. An advanced imaging technique developed for conventional ultrasonic transducers, the Total Focusing Method (TFM), is adapted for laser ultrasonics and then applied to the captured data, focusing at each point of the reconstruction area. In this way, the beamforming and steering of the ultrasound is done during the post processing. A 1-D laser induced ultrasonic phased array is synthesized with significantly improved spatial resolution and defect detectability. In this study, shear waves are used for the imaging, since they are more efficiently produced than longitudinal waves in the nondestructive, thermoelastic regime. Experimental results are presented from nondestructive, laser ultrasonic inspection of aluminum samples with side drilled holes and slots at depths varying between 5 and 20mm from the surface.

KW - laser ultrasonics

KW - non-contact

KW - array imaging

KW - full marix capture

KW - thermoelastic regime

KW - total focusing method

KW - shear waves

UR - http://www.scopus.com/inward/record.url?scp=85016002099&partnerID=8YFLogxK

UR - http://aip.scitation.org/toc/apc/1806/1?expanded=1806

U2 - 10.1063/1.4974563

DO - 10.1063/1.4974563

M3 - Conference contribution book

SN - 9780735414747

VL - 1806

BT - 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36

A2 - Chimenti, Dale E.

A2 - Bond, Leonard J.

CY - Melville, NY

ER -

Stratoudaki T, Clark M, Wilcox PD. Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays. In Chimenti DE, Bond LJ, editors, 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36. Vol. 1806. Melville, NY. 2017. 020022 https://doi.org/10.1063/1.4974563