Two-dimensional virtual array for ultrasonic nondestructive evaluation using a time-reversal chaotic cavity

Youngsoo Choi, Hunki Lee, Hyun Hong, Won Suk Ohm

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Despite its introduction more than a decade ago, a two-dimensional ultrasonic array remains a luxury in nondestructive evaluation because of the complexity and cost associated with its fabrication and operation. This paper describes the construction and performance of a two-dimensional virtual array that solves these problems. The virtual array consists of only two transducers (one each for transmit and receive) and an aluminum chaotic cavity, augmented by a 10 10 matrix array of rectangular rods. Each rod, serving as an elastic waveguide, is calibrated to emit a collimated pulsed sound beam centered at 2.5 MHz using the reciprocal time reversal. The resulting virtual array is capable of pulse-echo interrogation of a solid sample in direct contact along 10 10 scan lines. Three-dimensional imaging of an aluminum test piece, the nominal thickness of which is in the order of 1 cm, is successfully carried out using the virtual array.

Original languageEnglish
Pages (from-to)2720-2727
Number of pages8
JournalJournal of the Acoustical Society of America
Issue number5
Publication statusPublished - 2011 Nov

Bibliographical note

Funding Information:
This work was supported by Robogen, Inc. The authors thank Dr. Yong-Tae Kim at Korea Research Institute of Standards and Science for helpful advice and equipment.

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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