Lorentz force eddy current testing: Force dependency in respect to the lift-off distance - computation & validation

Lorentz force eddy current testing is a new nondestructive testing technique that enables its user to detect and localize defects deeply inside a conductive nonmagnetic solid state body. Since the magnet flux density B→ of a permanent magnet is decaying fast in space it is necessary to validate the known model of a point-like dipole by using finite sized magnets. The paper is comparing the dipole model above an infinite plane with the numerical model of finite shaped magnets and validation experiments. Using the obtained results design criteria for measurement setups can be derived.