Method and apparatus for measuring the polarized potential of a buried or submerged structure protected by impressed current
US4591792A · kind A · utility
18Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Feb 8, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F13/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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 an 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.