DEVICE FOR DETECTION OF PASSAGE OF MAGNETIC MATERIAL OBJECTS INSIDE PIPE LINE Russian patent published in 1997 - IPC

FIELD: devices for detection of passage of cleaning tools-flaw detectors and other objects made from magnetic materials inside pipe lines. SUBSTANCE: device includes AC signal source (generator) with inductance coil connected to it} inductance coil embraces the pipe line. Device includes also receiving converter made in form of two coils connected in series opposition; these coils embrace pipe line. Output of receiving converter is connected in series with the following components: amplifier, band-pass filter, synchronous detector, threshold circuit, time gate and indicator. Synchronization input of synchronous detector is connected to AC signal source. Inductance coils of receiving converter are preferably identical and are located at equal distance from inductance coil of AC signal source. EFFECT: enhanced efficiency. 3 cl, 2 dwg