Thickness Measurement

THICKNESS MEASUREMENT

Eddy current techniques are used to measure the thickness of nonconductive coatings on metal substrates in a non-destructive manner. An alternating magnetic field is created at the surface of the instrument's probe using a coil that conducts a high-frequency alternating current (over 8 MHz). When the coating thickness probe is brought close to a conductive surface, the alternating magnetic field creates eddy currents. The size of the eddy currents is affected by the substrate properties and the distance of the probe from the substrate (the coating thickness).

Probe

Set of thickness gauges

Basic stages of the probe manufacturing process