Hysteretic Interference of Time-Overlapping Magnetic Field Pulses

详细

We present calculations of the dependences of the electric voltage \(U\left( H \right)\) across a magnetic field transducer, scanning a magnetic medium with residual magnetic fields, on the magnetic field strength. The ascending and descending branches of the hysteresis dependences \(U\left( H \right)\) are described by arctangent functions. The distributions of the electric voltage \(U{\kern 1pt} \left( x \right)\) over the distance \(x\) to the projection of the axis of a linear source of pulsed magnetic field onto the magnetic carrier are also presented. Based on the resulting distributions, optical images of residual magnetic fields are formed. The distributions \(U{\kern 1pt} \left( x \right)\) are produced for magnetic field pulses overlapping in time and delayed relative to each other. It is shown that the results obtained make it possible to increase the sensitivity of measurements and the accuracy of thickness gaging and determining parameters of discontinuities in electrically conductive objects.