Method and apparatus for measuring the polarized potential...

Details Method and apparatus for measuring the polarized potential... Method and apparatus for measuring the polarized potential...

G - Physics

01

N

324/23, 324/59

G01N 27/00 (2006.01)

Patent

CA 1229382

Abstract Of The Disclosure The polarized potential at the boundary between a submerged pipe and a medium is measured unaffected by the presence of a distributed IR drop in the medium due to a impressed current from a corrosion protection system. The voltage between the pipe and a reference electrode in the medium is measured when the protection system current is zero. This is accomplished with a sample-and-hold circuit controlled by a trigger signal derived from the input signal and having a variable phase for controlling the phase angle at which the sample is taken.

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