Method and device for testing for flaws with the eddy-current pr

Details Method and device for testing for flaws with the eddy-current pr Method and device for testing for flaws with the eddy-current pr

1986-11-24

1989-04-11

Lall, Parshotam S.

Boots, shoes, and leggings

73779, 324209, 324237, 324240, 364507, 364552, G06F 1520, G01N 2782

Patent

active

048212040

ABSTRACT:
The object of the invention is a method and a device for materials testing using the eddy-current principle. If a coil (30) is moved in relation to test specimens, magnetic alternating fields with differing frequencies are generated, these fields induce eddy-currents that cause a secondary field in the coil (30). A number of test specimens having the same structure and the same dimensions are measured. The measured values are stored. The coordinates of the center of gravity of the measured values in the complex plane are then determined. The the phase angle is determined of that axis which runs longitudinally through the field (20) formed by the measured values in the complex plane. The center of gravity is then rotated into the origin of the coordinate system and the axis into a coordinate axis. Then a threshold value envelope determining a fault boundary is placed around the field of the measured values. The threshold value curve is then displaced by the coordinates of the center of gravity and rotated by the phase angle of the axis. In later measurement of test specimens for fault detection, the measured values are directly compared with the values of the transformed threshold value envelope.

REFERENCES:
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patent: 4322683 (1982-03-01), Vieira et al.
patent: 4507610 (1985-03-01), Nakaoka
patent: 4596150 (1986-06-01), Kuhr
patent: 4628261 (1986-12-01), Huschelrath et al.
patent: 4631688 (1986-12-01), Boehm et al.
patent: 4641092 (1987-02-01), Sakamoto et al.
patent: 4648041 (1987-03-01), Tarr
patent: 4652822 (1987-03-01), Wallace

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