关键词: 超声导波, 单通道, 管道检测, 时间反转

Abstract: Aiming at the multi-channel problem for the time reversal guided wave inspection, a new signal incited method is proposed based on the investigation of the relationship between the detection signals and the locations of transducers. In this method, different time reversal signals are re-incited one by one by different transducers with different time intervals which will be compensated by the intervals between different transducers. According to this, a time reversal guided wave defect inspection method based on one signal generator channel can be realized on reasonable transducer locations, interception window width and L(0, 2) mode used for forcing defect guided wave source. The result of numerical simulation show that the interception window width and the quantity of transducers are important factors influencing inspection capability of the time reversal guided wave.

Key words: One signal generator channel, Pipe inspection, Time reversal, Ultrasonic guided wave