Wave Mode Discrimination of Coded Ultrasonic Guided Waves Using Two-Dimensional Compressed Pulse Analysis

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Sergio MaloTat-Hean Gan

Abstract

Ultrasonic guided waves testing is a technique successfully used in many industrial scenarios worldwide. For many complex applications, the dispersive nature and multimode behavior of the technique still poses a challenge for correct defect detection capabilities. In order to improve the performance of the guided waves, a 2-D compressed pulse analysis is presented in this paper. This novel technique combines the use of pulse compression and dispersion compensation in order to improve the signal-to-noise ratio (SNR) and temporal-spatial resolution of the signals. The ability of the technique to discriminate different wave modes is also highlighted. In addition, an iterative algorithm is developed to identify the wave modes of interest using adaptive peak detection to enable automatic wave mode discrimination. The employed algorithm is developed in order to pave the way for further in situ applications. The performance of Barker-coded and chirp waveforms is studied in a multimodal scenario where longitudinal and flexural wave packets are superposed. The technique is tested in both synthetic and experimental conditions. The enhancements in SNR and temporal resolution are quantified as well as their ability to accurately calculate ...Continue Reading

References

May 15, 2003·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Paul D Wilcox
Apr 2, 2005·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Richard Y Chiao, Xiaohui Hao
Apr 2, 2005·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Tat Hean GanPaul D Harris
Mar 3, 2007·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Heng ZhaoShangkai Gao
Apr 17, 2012·The Journal of the Acoustical Society of America·Kailiang XuWeiqi Wang
May 27, 2014·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Kailiang XuWeiqi Wang
Jul 6, 2014·The Journal of the Acoustical Society of America·Tho N H T TranEdmond H M Lou
Oct 6, 2014·Ultrasound in Medicine & Biology·Tho N H T TranLawrence H Le
Nov 17, 2015·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Jing LinZhi Luo

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