MFL is chiefly concerned with interpreting a leaking magnetic field.
The Floormap’s rare earth permanent magnets create a localised magnetic field that fills or “Saturates” the inspection surface.
Then, as the Floormap is driven over a region of corrosion, the magnetic field will leak from the inspection plate.
It is this leaking field that is detected by suitably placed sensors and ultimately, via signal processing, provides an estimated percentage loss (EPL)
A major contributing factor to the amount of leaking field is the amount or volume of material missing from the inspection plate. The larger the corrosion or indication, the greater the leaking field, and thus the greater the outputted MFL signal.