Device for spatially resolved and non-destructive inspection of magnetic parameters

摘要

An induction sensor (1) having a positional resolution in the microstructure region and a Hall probe (14) record the magnetic parameters, such as a Barkhausen noise curve, to be stored in an interim store (40) at every point encountered by a positioning device (22) situated at a spacing controlled by a control circuit on the surface of a test specimen (30). The internal stress state and microstructure state of the test-specimen surface is imaged in an output device (45) with a resolution in the micrometre region by assigning the values corresponding to the measurement points to the characteristic values of the Barkhausen noise curve filtered by a discriminator (41). The eddy current impedance and the incremental permeability can furthermore be determined as a function of position with an impedance-measuring device (52).