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Synthetic Complex-Frequency wave for SNR boost in rail EMAT testing
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DOI：10.1016/j.ymssp.2026.114399.png)
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Abstract
En 中文
Railway safety and efficiency rely on real-time monitoring of rail conditions, yet magnetic losses and long propagation distances severely attenuate signals in electromagnetic acoustic transducer (EMAT) guided-wave testing, leading to compromised detection accuracy. To address these issues, this study adapts complex-frequency wave technique (a multi-frequency excitation and synthesis method) to improve the signal-to-noise ratio (SNR) and amplitude of received ultrasonic guided waves. Based on actual frequency measurements, a complex-frequency synthetic wave is constructed, and a virtual gain is introduced to compensate for the magnetic loss in the rail. Both numerical and experimental studies were conducted on different segments of P60 rail. Compared with signals generated by traditional single-frequency excitation, the proposed method achieved an approximate 15 ∼ 25% increase in signal amplitude and 2 ∼ 3 dB improvement in SNR. These findings demonstrate the method’s potential for practical application in enhancing the performance of electromagnetic ultrasonic rail inspection.
Keywords:
EMAT
guided-wave testing
complex-frequency wave
signal-to-noise ratio
rail inspection
Journal
IF:
8.9
Papers:
1.2W
Citations:
6.6W
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Cited Papers