Method of magnetographic inspection of quality of materials
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United States of America Patent
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Feb 21, 1989
Grant Date -
N/A
app pub date -
Aug 11, 1986
filing date -
Aug 2, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of 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. A magnetizing device comprising a magnetic yoke and a magnetizing coil lossely fitted thereon and composed of sections which are connected in parallel to one another.
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