Patent ID: 6298732
Filing Date: 2001-10-09
Classification: G01N

Abstract:
A method of identifying corrosion on an electromagnetically permeable member, said method comprising:a. transmitting near side and far side electric or electromagnetic pulses (waves) from, respectively, near side and far side spaced transmitting locations on said member, with said pulses (waves) travelling toward one another to intersect at intersecting locations on said elongate member,b. Receiving said far side pulses (waves) as wave forms at a receiving location after intersection with related nearside pulses (waves),c. Synchronizing transmission of the near side and far side pulses (waves) so that the intersections of the near side and far side pulses (waves) occur at spaced intersecting locations on said member;d. combining the wave forms of at least two of said far side pulses (waves) which are spaced from one another to form a composite wave form;e. ascertaining a variation or variations in said composite wave form as a means of detecting corrosion.