Non-Destructive Inspection ATLAS

About FSM..

mark Fundamental principle

FSM fundamental principle is based on ‘Ohm’s law (Voltage ‘V’= Current ‘I’ x Resistance value ‘R’)’.

Passing an electric current pulse through an electrically-conducting material to be measured, FSM measures an electric potential difference between both ends of the measuring position.

If a flaw is present in the measuring position (any types of changes including cracking, surface erosion, suspension current, corrosion, pitting corrosion and inter-granular corrosion), the electric potential difference will show a different value from a standard value which should be gained when the measurement position is sound.

Therefore, the geometry of corrosion, thinning or crack length can be defined by comparing the measured electric potential differences with a standard value.

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