FIELD: metrology.
SUBSTANCE: fine dispersed ferromagnet powder is added to sample of tested hermetic material. To find arise of changes in internal structure of hermetic during multi-cycle deformations it is subject to, magnetic field is created by means of concentrated inductance coil of resonant circuit. Magnetic field changes as ferromagnet particles re-distribute, which particles were added into hermetic sample, which causes changes in resonant frequency of circuit. Arise of internal disturbances in continuity is judged from change in frequency of measuring oscillator.
EFFECT: improved reliability of results.
1 dwg
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