| 摘要 |
The present invention relates to an inductive electromagnetic investigative method and is used for determining the presence of constituent mixtures of metallic compositions in a body The moethod comprises the steps of creating at least one electromagnetic field inductively coupling the body to be investigated with the field for exciting the body to produce current flow in any such mixtures which by virtue of their inherent non linear circuit characteristics, give rise to secondary electromagnetic field effects which are non linear with respect to the created field. Investigating any secondary electromagnetic field created by the @excitation@ of the body for the presence of any such non linear secondary electromagnetic field effects, to determine such mixtures are present indivative of the nature of the body. |
