A Study of Applying Pulsed Remote Field Eddy Current in Ferromagnetic Pipes Testing

Area of Science:

• Non-destructive testing
• Electromagnetism
• Signal processing

Background:

• Pulsed Remote Field Eddy Current Testing (PRFECT) is a promising technique for inspecting ferromagnetic pipes due to its continuous spectrum.
• Current methods using Least Squares Support Vector Regression (LSSVR) for zero-crossing time analysis can be confounded by secondary peaks caused by defects.

Discussion:

• A secondary peak in zero-crossing time analysis during PRFECT of pipes can lead to inaccurate defect quantification and localization.
• This issue is particularly problematic when defects are only detectable at the transmitter's location.

Key Insights:

• The proposed method utilizes double sensing coils in the transition zone and applies a Wiener deconvolution filter to mitigate secondary peaks.
• Zero-mean normalization calibrates the differential signals from the double sensing coils, accounting for position-dependent responses.

Outlook:

• The validated simulation results demonstrate that the proposed technique significantly enhances the practicality of PRFECT for ferromagnetic pipe inspection.
• This advancement offers improved reliability in detecting and analyzing defects in critical infrastructure.