METHOD FOR M DEPTH OF FLAW IN FERROMAGNETIC OBJECT AND DEVICE FOR IMPLEMENTATION OF SAID METHOD Russian patent published in 1995 - IPC

FIELD: nondestructive flaw detection. SUBSTANCE: method involves magnetizing an object in permanent magnetic field, measuring tangential constituent of magnetic field of flaw, measuring magnetic field of flaw in point where it is independent from height of measuring. Depth of flaw is judged by this value. corresponding device has U-shaped electric magnet, power supply, transducer for measuring tangential constituent of magnetic field of flaw, circuit for monitoring maximum of tangential constituent of magnetic field of flaw, indicator of flaw presence, electronic switch, detector, circuit for linearization of detector signal and indication unit. Transducer for measuring tangential constituent of magnetic field of flaw has two meters of magnetic field which are spaced from one another, transducer is positioned over object on constant height. EFFECT: facilitated manufacturing, increased precision. 2 cl, 3 dwg