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

Sivaram Nishal Ramadas, Joseph Jackson, Jerzy Dziewierz, Richard O'Leary, Anthony Gachagan

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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.
Original languageEnglish
Pages (from-to)496-504
Number of pages9
JournalIEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Volume61
Issue number3
DOIs
Publication statusPublished - Mar 2014

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Keywords

  • ultrasonic arrays
  • ultrasonic imaging
  • gratings
  • 2D fast Fourier transformation
  • conformal power map
  • nondestructive evaluation

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