SELF-CONTAINED CONTROL DEVICE WITH TRANSFORMER EDDY CURRENT TRANSDUCER

摘要

The invention relates to methods and means for non-destructive control by eddy current method and can be used in particular for development of static eddy-current defectoscopes for detection of defects in electro-conductive materials and articles. A self-contained control device with transformer eddy current transducer comprises a self-contained generator and eddy current transducer of transformer type connected to the circuit of inductive back coupling of the self-contained generator. The output of self-contained generator is connected to signal-processing circuit of the self-contained generator to indication block. According to the invention a pulse generator is additionally introduced, with output connected to the input of self-contained generator. The self-contained generator is realized on operating amplifier which output is connected through resistor to operating amplifier and through first capacitor to the primary winding of the eddy current transducer. The output of the secondary winding of vortex current through the second capacitor is connected to the inverting input of the operating amplifier. The resonance frequency of circuit that comprises the inductivity of the secondary winding and capacity of the second capacitor is selected as equal to the working frequency of control. And the frequency of output signals of pulse generator is selected as close to resonance frequency of the circuit. The device provides increase of reliability and productivity of control.