In order to test hardness of artillery parts in nondestructive and in-situ manner

an electromagnetic probe for hardness based on magnetic permeability measurement is proposed.The probe realizes detection in differential mode.It is composed of excitation coil and reference coils.The change of induced voltage caused by magnetic permeability variation is obtained by electric bridge.On this basis

finite element model of the related electromagnetic field-electric circuit coupled simulation is built.The effects on detection performance by probe structure

probe dimension

detection frequency and electric bridge are analyzed deeply

the results can provide guidance for fabrication of the probe.