METHOD OF DETECTING CORROSION IN PIPELINES AND THE LIKE BY COMPARATIVE PULSE PROPAGATION ANALYSIS

摘要

A method of dectecting corrosion on an elongate member (10), such as a pipe (10). Far side and near side electric pulses are transmitted into a magnetically permeable pipe (10) at spaced locations to travel toward one another. These are synchronized to intersect at various locations on the pipe (10). The resulting waveforms are analyzed by combining adjacent waveforms resulting from pulses intersection at spaced locations. Two combined waveforms are analyzed by subtracting one from the other to produce a difference waveform and the difference waveforms are compared to detect corrosion.