Rotating magnetic field device for detecting cracks in metal

Details Rotating magnetic field device for detecting cracks in metal Rotating magnetic field device for detecting cracks in metal

1980-09-10

1983-04-05

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324232, 324233, G01N 2790, G01R 3312

Patent

active

043792618

ABSTRACT:
An eddy current type of inspection device having input signal coils on cores radially arranged around a center and having outer ends of the cores which rest against a surface of a metal assembly to be tested for defects. The input coils are energized by an AC signal of different phase for each respective coil so that a rotating magnetic field is produced in the assembly being tested. An output sensor coil is mounted at the center of the tester immediately adjacent to such test surface for coupling out a signal induced from the rotating field. A specific embodiment has three coils physically spaced 120.degree. apart, for energizing by a three-phase power source.

REFERENCES:
patent: 2467306 (1949-04-01), Habig
patent: 2558485 (1951-06-01), Gow
patent: 3056920 (1962-10-01), Herrald
patent: 3109139 (1963-10-01), Branker
patent: 3359495 (1967-12-01), McMaster et al.
patent: 3449664 (1969-06-01), Smith
patent: 3609531 (1971-09-01), Forster
patent: 3855530 (1974-12-01), Fuji et al.
patent: 4155455 (1979-05-01), Spierer et al.

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