FIELD: physics.
SUBSTANCE: electrical currents are generated on two sides of the analysed section of a pipe. Movement is carried out on the pipeline route from a receiver with a magnetic field strength sensor. In the initial position, the magnetic axis of the sensor lies in the vertical plane passing through the axis of the pipe. Signals generated by components of magnetic field strength components in the given plane from both currents in the receiver are equal to zero. During movement, equality to zero of the signal from the current on one side of the pipe is constantly monitored through rotation about the vertical axis of the receiver. The point of damage to insulation is found from the signal in the receiver from the vector sum of magnetic field strength values generated by current on the other side of the pipe section and stray current from it.
EFFECT: efficient detection and accuracy of locating damages and reduced labour input.
2 dwg
