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Application of conformal map theory for design of 2-D ultrasonic array structure for NDT imaging application: a feasibility study.

Authors
  • Ramadas, Sivaram N
  • Jackson, Joseph C
  • Dziewierz, Jerzy
  • O'Leary, Richard
  • Gachagan, Anthony
Type
Published Article
Journal
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control
Publisher
Institute of Electrical and Electronics Engineers
Publication Date
Mar 01, 2014
Volume
61
Issue
3
Pages
496–504
Identifiers
DOI: 10.1109/TUFFC.2014.2933
PMID: 24569253
Source
Medline
License
Unknown

Abstract

Two-dimensional ultrasonic phased arrays are becoming increasingly popular in nondestructive evaluation (NDE). Sparse array element configurations are required to fully exploit the potential benefits of 2-D phased arrays. This paper applies the conformal mapping technique as a means of designing sparse 2-D array layouts for NDE applications. Modeling using both Huygens' field prediction theory and 2-D fast Fourier transformation is employed to study the resulting new structure. A conformal power map was used that, for fixed beam width, was shown in simulations to have a greater contrast than rectangular or random arrays. A prototype aperiodic 2-D array configuration for direct contact operation in steel, with operational frequency ~3 MHz, was designed using the array design principle described in this paper. Experimental results demonstrate a working sparse-array transducer capable of performing volumetric imaging.

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