DEVICE TO CONTROL PIPELINE WALLS Russian patent published in 2012 - IPC G01N27/82 

FIELD: machine building.

SUBSTANCE: proposed device has eddy current transducers arranged in magnetic gap between appropriate poles of permanent magnets and walls of controlled pipe. Excitation coils of eddy current transducers are supplied by alternating current using two or more signal coils arranged inside excitation coils with their axes aligned. Because of low frequency of transducer system, flaw detector speed if adjusted by bypass system with gas bypassing outside of said flaw detector using easily deformable ribbed fan-type collar that doubles as gas bypass cross-section regulator. Collar is deformed by pressing its ribs to flaw detector by means of electric drive. In case of power supply failure and to allow spontaneous travel of proposed device from point of failure to receiving chamber, electromagnetic coupling is used with its winding supplied from generators built-in bearing wheels. Eddy current transducer signals are detected by amplitude or phase detectors and registered by onboard recorders together with coordinate pickup signals.

EFFECT: improved operating performances, simplified design.

4 dwg