When using low-frequency ultrasonic TOF technology to measure the thickness of thick multi-layer composite media,there is a tendency for valid echoes and near surface interference waves to overlap and be difficult to separate between ultrasonic reflection echoes,which affects the measurement accuracy of TOF.In response to such problems,this article proposes an adaptive matched filtering processing method based on L1 norm.Based on the spatiotemporal consistency of near-surface interference,effective echoes exhibit distinct transition characteristics.In the spatiotemporal domain,the collected ultrasound array signals are adaptively matched to achieve the separation of effective echoes and near surface interference waves,thereby enhancing the resolution of effective echoes.The simulation data processing has demonstrated the effectiveness of the proposed method,with a 3 dB increase in signal-to-noise ratio.The experimental results show that this method can efficiently solve the problem of overlapping ultrasonic signal separation,and has shown broad application prospects in thickness measurement scenarios of solid rocket engines.
关键词
低频超声/大厚度多层介质/L1范数自适应匹配/重叠信号分离
Key words
low-frequency ultrasound/large thickness multi-layer media/L1 norm adaptive matching/overlapping signal separation
维普
万方数据