Characterisation of crack's dimensions using eddy current field measurement

This paper introduces a measurement device for identifying a crack's dimensions using eddy current measurement. Measurements of magnetic flux density are conducted for the purpose of finding a crack within a conductive plate. This is done on the basis of nondestructive testing using eddy currents. The absolute value of the magnetic flux density z-component is measured along an axle at the bottom of an excitation coil supplied with an alternating current. The measured B z is exemplified by a surface, whose shape depends on the crack's position and parameters. The received measured values then serve as the basis for the crack's identification and for determining its parameters.