DEVICE FOR high-frequency EDDY-current control of articles made of electro-conductive materials

摘要

The invention relates to means for non-destructive eddy-current control and can be used, in particular, for development of devices of high-frequency eddy-current control. Such devices are needed for control of materials with low specific electric conductivity. A device for high-frequency eddy-current control of articles made of electro-conductive materials that comprises generator of signal with frequency ƒ, output of this one is connected to the power amplifier, eddy-current transducer of transformer type, and circuit for processing signals with main frequency ƒ, output of which is connected to indication block equipped with additional generator of signal with frequency ƒ, two signal mixers and two band filters. At that the output of the main generator is connected to the output of the first signal mixer, the second output of this one is connected to the output of additional generator. The output of the first signal mixer is connected to the first filter output of which is connected to excitation winding of the eddy-current transducer. The output of the eddy-current transducer is connected to the input of the second signal mixer the second input of which is connected to the output of the additional generator. The output of the second signal mixer is connected to the second filter the output of which through the circuit for signal processing is connected to indication block. The device makes it possible to realize control at high frequencies (above 10 MHz).