conductivity;  Non-ferromagnetic metals;  Non-destructive testing

In view of the current situation that metal conductivity testing instruments at home and abroad must be calibrated by standard test blocks, and the detection object is limited to the conductivity range of the given standard test block, a new method for detecting metal conductivity is proposed in theory, that is, according to the known scattering field impedance value, the conductivity of metal is reversed by numerical calculation method, so as to overcome the limitation that existing metal conductivity testing instruments must be calibrated by standard test blocks, expand the scope of tested materials, and develop experimental conductivity detection instruments. The experiments carried out with this instrument show that the detection method is feasible and the detection instrument is reliable.