| 摘要 |
The present invention relates to a process for the detection of an object in an electrically conductive material and a corresponding sensor device. Process characterized in that it consists in generating, by means of a consequentially supplied inductance ( 3 ), a magnetic field adapted to induce Foucault currents in said conductive material, when said object ( 1 ) is located at a suitable distance from said inductance ( 3 ), in abruptly cutting the supply and the current flowing in said inductance ( 3 ), in collecting the voltage and/or current signal induced in said inductance ( 3 ) by said Foucault currents after cutting, and in analyzing the characteristics of said signal or signals, particularly its decay, thereby to deduce information concerning the nature and/or thickness of the conductive material of the detected object ( 1 ) and/or the distance between said inductance ( 3 ) and said object ( 1 ).
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