A MODEL-BASED AUTOFOCUS ALGORITHM FOR ULTRASONIC IMAGING USING A FLEXIBLE ARRAY

A. J. Hunter; B. W. Drinkwater; P. D. Wilcox

A MODEL-BASED AUTOFOCUS ALGORITHM FOR ULTRASONIC IMAGING USING A FLEXIBLE ARRAY

A. J. Hunter, B. W. Drinkwater, P. D. Wilcox

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

1 Citation (Scopus)

Abstract

Autofocus is a methodology for estimating and correcting errors in the assumed parameters of an imaging algorithm. It provides improved image quality and, therefore, better defect detection and characterization capabilities. In this paper, we present a new autofocus algorithm developed specifically for ultrasonic non-destructive testing and evaluation (NDE). We consider the estimation and correction of errors in the assumed element positions for a flexible ultrasonic array coupled to a specimen with an unknown surface profile. The algorithm performs a weighted least-squares minimization of the time-of-arrival errors in the echo data using assumed models for known features in the specimen. The algorithm is described for point and planar specimen features and demonstrated using experimental data from a flexible array prototype.

Original language	English
Title of host publication	REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 29A AND 29B
Editors	DO Thompson, DE Chimenti
Place of Publication	MELVILLE
Publisher	American Institute of Physics (AIP)
Pages	863-870
Number of pages	8
ISBN (Print)	978-0-7354-0748-0
Publication status	Published - 2010
Event	36th Annual Review of Progress in Quantitative Nondestructive Evaluation - Kingston, Jamaica Duration: 26 Jul 2009 → 31 Jul 2009

Conference

Conference	36th Annual Review of Progress in Quantitative Nondestructive Evaluation
Country/Territory	Jamaica
City	Kingston
Period	26/07/09 → 31/07/09

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@inproceedings{85dbae83d67a49a8b35baf4ff93c7fc0,

title = "A MODEL-BASED AUTOFOCUS ALGORITHM FOR ULTRASONIC IMAGING USING A FLEXIBLE ARRAY",

abstract = "Autofocus is a methodology for estimating and correcting errors in the assumed parameters of an imaging algorithm. It provides improved image quality and, therefore, better defect detection and characterization capabilities. In this paper, we present a new autofocus algorithm developed specifically for ultrasonic non-destructive testing and evaluation (NDE). We consider the estimation and correction of errors in the assumed element positions for a flexible ultrasonic array coupled to a specimen with an unknown surface profile. The algorithm performs a weighted least-squares minimization of the time-of-arrival errors in the echo data using assumed models for known features in the specimen. The algorithm is described for point and planar specimen features and demonstrated using experimental data from a flexible array prototype.",

author = "Hunter, {A. J.} and Drinkwater, {B. W.} and Wilcox, {P. D.}",

year = "2010",

language = "English",

isbn = "978-0-7354-0748-0",

pages = "863--870",

editor = "DO Thompson and DE Chimenti",

booktitle = "REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 29A AND 29B",

publisher = "American Institute of Physics (AIP)",

address = "United States",

note = "36th Annual Review of Progress in Quantitative Nondestructive Evaluation ; Conference date: 26-07-2009 Through 31-07-2009",

}

Hunter, AJ, Drinkwater, BW & Wilcox, PD 2010, A MODEL-BASED AUTOFOCUS ALGORITHM FOR ULTRASONIC IMAGING USING A FLEXIBLE ARRAY. in DO Thompson & DE Chimenti (eds), REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 29A AND 29B. American Institute of Physics (AIP), MELVILLE, pp. 863-870, 36th Annual Review of Progress in Quantitative Nondestructive Evaluation, Kingston, Jamaica, 26/07/09.

A MODEL-BASED AUTOFOCUS ALGORITHM FOR ULTRASONIC IMAGING USING A FLEXIBLE ARRAY. / Hunter, A. J.; Drinkwater, B. W.; Wilcox, P. D.

REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 29A AND 29B. ed. / DO Thompson; DE Chimenti. MELVILLE : American Institute of Physics (AIP), 2010. p. 863-870.

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

TY - GEN

T1 - A MODEL-BASED AUTOFOCUS ALGORITHM FOR ULTRASONIC IMAGING USING A FLEXIBLE ARRAY

AU - Hunter, A. J.

AU - Drinkwater, B. W.

AU - Wilcox, P. D.

PY - 2010

Y1 - 2010

N2 - Autofocus is a methodology for estimating and correcting errors in the assumed parameters of an imaging algorithm. It provides improved image quality and, therefore, better defect detection and characterization capabilities. In this paper, we present a new autofocus algorithm developed specifically for ultrasonic non-destructive testing and evaluation (NDE). We consider the estimation and correction of errors in the assumed element positions for a flexible ultrasonic array coupled to a specimen with an unknown surface profile. The algorithm performs a weighted least-squares minimization of the time-of-arrival errors in the echo data using assumed models for known features in the specimen. The algorithm is described for point and planar specimen features and demonstrated using experimental data from a flexible array prototype.

AB - Autofocus is a methodology for estimating and correcting errors in the assumed parameters of an imaging algorithm. It provides improved image quality and, therefore, better defect detection and characterization capabilities. In this paper, we present a new autofocus algorithm developed specifically for ultrasonic non-destructive testing and evaluation (NDE). We consider the estimation and correction of errors in the assumed element positions for a flexible ultrasonic array coupled to a specimen with an unknown surface profile. The algorithm performs a weighted least-squares minimization of the time-of-arrival errors in the echo data using assumed models for known features in the specimen. The algorithm is described for point and planar specimen features and demonstrated using experimental data from a flexible array prototype.

M3 - Conference Contribution (Conference Proceeding)

SN - 978-0-7354-0748-0

SP - 863

EP - 870

BT - REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 29A AND 29B

A2 - Thompson, DO

A2 - Chimenti, DE

PB - American Institute of Physics (AIP)

CY - MELVILLE

T2 - 36th Annual Review of Progress in Quantitative Nondestructive Evaluation

Y2 - 26 July 2009 through 31 July 2009

ER -

A MODEL-BASED AUTOFOCUS ALGORITHM FOR ULTRASONIC IMAGING USING A FLEXIBLE ARRAY

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