The feasibility of synthetic aperture guided wave imaging to a mobile sensor platform

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A mobile sensor platform that features a non-contact guided wave piezoelectric composite transducer payload for rapid inspection of large plate-like structures is presented. The paper begins with results from an experimental B-scan of an aluminium plate. Since the current guided wave payload uses 30 mm square transducers (9λ9λ wide) the system provides fairly course lateral resolution that in this case is approximately equal to the width of the transducer. The paper goes on to use simulation tools to examine the practical SNR and resolution limits of this approach. When using narrow aperture transducers that provide a wide field of view it is important to apply the synthetic aperture focusing technique to maximise image resolution. It is shown that resolution is a function of both transducer aperture and robot positional uncertainty since the effectiveness of synthetic aperture techniques is directly dependent on positional accuracy. It is also shown that since systems utilising larger aperture transducers with a narrow field of view are not as dependent on synthetic array reconstruction, they can outperform systems with narrower transducers in cases where there is relatively large positional uncertainty. Lastly the resolution and relative SNR are modelled as functions of transducer aperture for the cases of B-scan and synthetic array processing.
LanguageEnglish
Pages10-17
Number of pages8
JournalNDT and E International
Volume58
DOIs
Publication statusPublished - 1 Sep 2013

Fingerprint

Synthetic apertures
synthetic apertures
Guided electromagnetic wave propagation
Transducers
transducers
platforms
Imaging techniques
sensors
Sensors
synthetic arrays
apertures
payloads
field of view
Array processing
Optical resolving power
image resolution
Image resolution
Aluminum
robots
inspection

Keywords

  • automated
  • ultrasonic
  • guided wave
  • SAFT

Cite this

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The feasibility of synthetic aperture guided wave imaging to a mobile sensor platform. / Dobie, Gordon; Pierce, S. Gareth; Hayward, Gordon.

In: NDT and E International, Vol. 58, 01.09.2013, p. 10-17.

Research output: Contribution to journalArticle

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