Electricity: measuring and testing – Magnetic – By paramagnetic particles
Patent
1989-05-08
1990-06-05
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
By paramagnetic particles
324232, 324262, G01N 2784, G01R 3312
Patent
active
049317318
ABSTRACT:
A ferrous metal inspection device particularly for elongated parts provides high intensity DC magnetic fields in each of two modes contemporaneously. One mode is generated by passing a DC current axially through the part to be inspected and the other is generated by a separate DC current passing through a pair of electromagnet coils positioned one at each axial end of a part to be inspected. Magnetic field lines are thereby generated in a pair of mutually orthogonal planes. Control and polarity of the two direct currents is effected by controlling the phase of conduction of separate corresponding silicon controlled rectifiers. The part to be inspected is drenched with a mixture of fine ferrous particles in a liquid vehicle. Solenoid wound coils connected in series or parallel are placed, one at each end of the part and a third coil surrounds the part circumferentially, thereby producing two substantially orthogonal magnetic fields. The ferrous particles of any orientation define flaws in the part being tested, for visual evaluation.
REFERENCES:
patent: 2110759 (1938-03-01), De Forest
patent: 2242366 (1941-05-01), Muller
patent: 2423552 (1947-07-01), Clarke
patent: 2481937 (1949-09-01), Mages
patent: 3034021 (1962-05-01), Callihan
patent: 3324354 (1967-06-01), Schroeder et al.
patent: 3694740 (1972-09-01), Bergstrand
patent: 4443759 (1984-04-01), Isaacson et al.
Eisenzopf Reinhard J.
Hertz Harvey S.
Snow Walter E.
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