Reference electrode IR drop corrector for cathodic and anodic protection systems
US4255242A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1979 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Aug 9, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R17/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In making measurements of the potential of a structure immersed in an electrolyte, which structure is being protected from corrosion by a cathodic or anodic protection system, serious errors are often introduced by the IR drop component induced by current flowing between the cathode and anode of the protection system on a reference cell which is used for measurement. To overcome this, a system is provided of the type including means for applying a rectified alternating current voltage between the structure and an electrode which is immersed in the electrolyte and spaced apart from the structure. A direct current reference source is coupled to the structure. A reference cell is located in the electrolyte and spaced apart from the structure. The reference cell is also coupled to means for measuring the potential produced by the reference cell and the structure wherein the measuring means includes means for separating any voltage component of the rectified alternating current at the reference cell from the direct current voltage produced by the reference cell. The measuring means also includes output means for providing an output voltage having only the cell-to-structure potential to …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.