1-D Profiling Using Highly Dispersive Guided Waves

摘要

Corrosion is one of the industries major issues regarding the integrity of assets. Currently, inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. There are many situations where the actual defect location is not easily accessible, e.g., a pipe support or a partially buried pipe. Guided wave tomography has been developed to reconstruct the wall thickness of steel pipes. In case of bottom of the line corrosion, i.e., a single corrosion pit, a simpler approach may be followed. This method is intended for rapid, semi-quantitative screening of pipes Data is collected in a pitch-catch configuration at the 12 o'clock position using highly dispersive guided waves. We invert for the wall thickness profile in the circumferential direction, assuming a simple defect profile. The approach is evaluated on numerically simulated data and on measured data.