METHOD AND DEVICE FOR DIAGNOSTICS OF TECHNICAL STATE OF UNDERGROUND PIPELINES Russian patent published in 2014 - IPC G01N27/82 

FIELD: machine building.

SUBSTANCE: in a diagnostics method at least 18 single-component sensors of a constant magnetic field are used as sensors of the field; compensation of action on measurement results of fluctuation of constant magnetic field of the Earth is performed. Mathematical processing of measurements is performed based on sum and difference of signals of coaxial components of the field. As mathematical processing, tensorial processing of a matrix of gradients is used; the above matrix is composed based on measurement results so that linear, quadratic and cubic invariants are obtained and components of magnetic moments of defect anomalies obtained on the basis of a solution of an equation system are calculated. At processing of measurements there excluded from processing are intervals of measurement recording, which exceed the load action time determined as to exceedance of amplitudes of threshold values of measured signals.

EFFECT: improving accuracy of determination of a pipeline run trajectory, detection, geometrisation and ranging of defects of metal and insulation.

6 cl, 5 dwg