Field Kelvin Probe (FKP)
Scientists at Christian Michelsen Research are currently developing, together with colleagues from the Max Planck Institute for Iron Research (Germany), the Field Kelvin Probe (FKP) that will enable contactless detection of hidden corrosion on - and off-shore installations.
The core of the FKP is a variable capacitor in which one of the capacitor’s plates is represented by the object under investigation while the other plate is the sensing element of the FKP. The contactless detection of a corrosion potential is achieved by converting the AC current generated by a capacitor into a Volta potential. A simple calibration then allows the FKP to translate the measured Volta potential into one of the following tale-telling parameters:
- corrosion potential of bare or coated steel,
- concentration of diffusible hydrogen in steel.
Both parameters are important for early corrosion detection. Although the FKP is primary designed for offshore applications, it can be applied on virtually any metallic surface that could be subjected to corrosion.
Eugen Florin Turcu. «Veien mot nye og mer pålitelige inspeksjonsteknologier», Rust og Råte, October 2015.