| 摘要 |
<p>A synthetic phase tuned multi-mode acoustic guided wave system (10) and method activates at least one of a plurality of elements (14, 16, 18) as a receiver (18) or a transmitter (14, 16) and at least two of the elements as transmitters (14, 16) or receivers (18), respectively, and sequentially excites each of the transmitter elements (14, 16) for creating a train of acoustic guided waves which includes a selected mode. The system (10) then shifts the acoustic guided waves of the selected mode sensed by the receivers by a period which is a function of the phase velocity of the selected mode and sums the shifted waves to reinforce the selected mode.</p> |
