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

摘要

A method of dectectingcor-rosion on an elongate member (10),such as a pipe (10). Far side andnear side electric pulses aretrans-mitted into a magneticallyperme-able pipe (10) at spaced locationsto travel toward one another. Theseare synchronized to intersect atvar-ious locations on the pipe (10). Theresulting waveforms are analyzedby combining adjacent waveformsresulting from pulses intersection atspaced locations. Two combinedwaveforms are analyzed bysub-tracting one from the other topro-duce a difference waveform and thedifference waveforms are comparedto detect corrosion.