METHOD AND DEVICE FOR DIAGNOSTICS OF BURIED PIPELINE Russian patent published in 2014 - IPC G01N27/82 

FIELD: instrumentation.

SUBSTANCE: proposed device consists in measurement of gradients of permanent magnetic field components actual in time at several levels with the help of at least three strips of magnetic resistors displaced by operator along pipeline axis. Two strips of magnetic resistors are arranged vertically and one strip is fitted horizontally. Every strip is composed of three three-component transducers. Gradients (∂Xi/∂y, ∂Yi/∂y, ∂Zi/∂y) are computed proceeding from recorded data for every component of the transducer for time interval defined by hardware performances, that is, at the rate of 6256 measurements a second. Said gradients are defined as the difference (Xi+1-Xi)/Δy, (Yi+1-Yi)/ Δy, (Zi+1-Zi)/ Δy at Δy→0. Application of gradients obtained in small time interval allows getting rid of errors related with unstable operation of transducers, change in their sensitivity, increase in scatter of transducer parameters and their dependence upon temperature.

EFFECT: fast response, accurate detection of buried pipeline defects, better operating performances.

4 cl, 2 dwg