High-Precision Corrosion Detection via SH1 Guided Wave Based on Full Waveform Inversion

Area of Science:

• Materials Science
• Non-Destructive Testing
• Ultrasonic Wave Propagation

Background:

• Corrosion detection in industrial settings is vital for operational safety and efficiency.
• Guided-wave full-waveform inversion tomography offers high imaging resolution for plate metal corrosion.
• Existing methods using A0 and S0 modes lack resolution for early-stage, small defects due to long wavelengths.

Purpose of the Study:

• To develop a high-precision corrosion detection method for early-stage defects.
• To leverage the short wavelength characteristics of the SH1 mode wave for improved resolution.
• To enhance the accuracy of full waveform inversion algorithms in corrosion detection.

Main Methods:

• Utilized finite element simulations of ultrasonic-guided waves on aluminum plates with simulated corrosion defects.
• Compared the detection precision of A0, S0, and SH1 guided wave modes.
• Employed full waveform inversion algorithms with SH1 guided waves.
• Conducted experimental validation on aluminum plates with various defect types.

Main Results:

• The SH1 mode wave demonstrated superior imaging accuracy for shallow and small defects compared to A0 and S0 modes, regardless of defect regularity.
• Finite element simulations confirmed the higher resolution of the SH1 mode.
• Experimental results validated the effective reconstruction of shape and size for small, shallow defects using SH1 guided waves.

Conclusions:

• The proposed full waveform inversion method utilizing SH1 guided waves significantly enhances corrosion detection precision for small and shallow defects in aluminum plates.
• SH1 guided waves offer a more effective solution for early-stage corrosion monitoring than conventional modes.
• This technique holds promise for improving the safety and efficiency of industrial operations through advanced non-destructive testing.