| Citation: | SHI W Z，HUANG Q K，LU C，et al. Application of pulse compression technique in steel plate corrosion detection with SH guided wave EMATs[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（2）：324-334 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0229
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The application of Barker code pulse compression technique in a shear horizontal (SH) guided wave electromagnetic acoustic transducer (EMAT) has significant value in engineering application as it enhances the signal-to-noise ratio (SNR) and spatial resolution of the corrosion echo detected in in-service steel plates, and helps to realize large-scale and rapid on-line scanning. In this paper, a finite element model of SH-guided wave propagation in a steel plate excited by Barker code signals is established. Then, combined with experimental analysis and numerical calculations, the effects of Barker code sequence length, subpulse length, EMAT design parameters, and lift-off on the SNR and wave packet width of the pulse-compressed echoes are analyzed and compared with those of the traditional tone-burst excitation method. The results show that the SNR of the defect echo processed with the Barker code pulse compression technique is 5.8 dB higher than that with the tone-burst excitation method. When the EMAT liftoff is 3.0 mm, the SNR of the defect echo after Barker code pulse compression is greater than 8.7 dB, while that with the tone-burst excitation method is approximately 0 dB. When the sequence length and subpulse of the Barker code signals are respectively 13 and 15 μs, a circular hole with a depth of 1 mm and a diameter of 20 mm can be detected, the SNR of which is greater than 25.4 dB.
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