| 摘要 |
<p>A method of non-destructive eddy-current testing of the characteristics of electrically conductive parts wherein the part to be inspected is introduced inside an induction winding connected at an intermediate point to the electrode which serves as cathode of an active electronic device, said winding being intended to serve both as a coil for generating an alternating magnetic field which produces eddy currents within said part and as a coil for detecting the field induced by said currents, and wherein an alternating-current voltage is applied to said active device and a given type of defect exhibited by said part is detected by studying the resultant changes according to the frequency of said alternating-current voltage in the voltage collected at the electrode which serves as a grid of the active device and/or in the terminal voltage of said winding.</p> |
