NONDESTRUCTIVE INSPECTION METHOD OF PIPELINES AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC G01N27/83 

FIELD: instrument engineering.

SUBSTANCE: use: for control of pipelines. Summary of invention consists in the fact that through the pipeline current is passed with a broadband uniform spectrum in range of 200 Hz–1 kHz and sensors of the magnetic field amplitude are moved in the longitudinal inside the pipeline, fixing in each current measurement period longitudinal and angular coordinates of sensors, analyzing spectra of their output signals and determining the frequency of the maximum harmonic amplitude, from which the minimum wall thickness of the pipeline is determined in a point corresponding to the current longitudinal and angular coordinates of the sensor with the maximum amplitude of the output signal harmonic. A device implementing the proposed method, a control unit, a current generator, a data processing unit and a diagnostic robot with a measuring node, on which sensors of amplitude of magnetic field inside the pipeline are located.

EFFECT: higher quality, reliability and accuracy of control.

2 cl, 1 dwg