Two-dimensional virtual array for ultrasonic nondestructive evaluation using a time-reversal chaotic cavity |
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Authors: | Choi Youngsoo Lee Hunki Hong Hyun Ohm Won-Suk |
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Affiliation: | School of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea. |
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Abstract: | 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. |
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