Magnetizing device with yoke having loosely fitted coil sections

Details Magnetizing device with yoke having loosely fitted coil sections Magnetizing device with yoke having loosely fitted coil sections

1988-03-28

1989-11-28

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic recording medium on magnetized object records...

335284, 336225, G01N 2785, H01F 1300, H01F 1704

Patent

active

048840289

ABSTRACT:
A device for magnetographic quality inspection of a material, whereby a magnetic-recording medium is applied onto the material to be inspected, and they are together magnetized so that the resulting magnetogram can be used to assess the quality of the material. According to the invention, the intensity of the magnetizing field is established by the maximum curvature of the surface of a drop of a magnetic fluid applied onto the surface of the material to be inspected. A magnetic substance is placed between the magnetic-recording medium and the material so that the surface of the latter is smoothed out. The magnetizing device includes a magnetic yoke and a magnetizing coil loosely fitted thereon and composed of sections which are connected in parallel to one another.

REFERENCES:
patent: 965062 (1910-07-01), Beck
patent: 1176474 (1916-03-01), McDonald
patent: 3430133 (1969-02-01), Greiner
patent: 3546580 (1970-12-01), Williams
patent: 4447778 (1984-05-01), Stumm

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