Optimization of element length for imaging small volumetric reflectors with linear ultrasonic arrays

T. S. Barber*, P. D. Wilcox, A. D. Nixon

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)
344 Downloads (Pure)

Abstract

A 3D ultrasonic simulation study is presented, aimed at understanding the effect of element length for imaging small volumetric flaws with linear arrays in ultrasonically noisy materials. The geometry of a linear array can be described by the width, pitch and total number of the elements along with the length perpendicular to imaging plane. This paper is concerned with the latter parameter, which tends to be ignored in array optimization studies and is often chosen arbitrarily for industrial array inspections. A 3D analytical model based on imaging a point target is described, validated and used to make calculations of relative Signal-to-Noise Ratio (SNR) as a function of element length. SNR is found to be highly sensitive to element length with a 12dB variation observed over the length range investigated. It is then demonstrated that the optimal length can be predicted directly from the Point Spread Function (PSF) of the imaging system as well as the natural focal point of the array element from 2D beam profiles perpendicular to the imaging plane. This result suggests that the optimal length for any imaging position can be predicted without the need for a full 3D model and is independent of element pitch and the number of elements. Array element design guidelines are then described with respect to wavelength and extensions of these results are discussed for application to realistically-sized defects and coarse-grained materials.

Original languageEnglish
Title of host publication42nd Annual Review of Progress in Quantitative Nondestructive Evaluation
Subtitle of host publicationIncorporating the 6th European-American Workshop on Reliability of NDE
EditorsDale E Chimenti, Leonard J Bond
PublisherAmerican Institute of Physics (AIP)
Number of pages10
ISBN (Print)9780735413535
DOIs
Publication statusPublished - 10 Feb 2016
Event42nd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE 2015): Incorporating the 6th European-American Workshop on Reliability of NDE - Minneapolis, Minnesota, United States
Duration: 26 Jul 201531 Jul 2015
Conference number: 42

Publication series

NameAIP Conference Proceedings
PublisherAIP Publishing
Volume1706
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference42nd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE 2015)
Abbreviated titleQNDE 2015
Country/TerritoryUnited States
CityMinneapolis, Minnesota
Period26/07/1531/07/15

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