On the Flow of the Magnetic Flux in a Metal Plate for a Thickness Gage

概要

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This paper has been presented for a fundamental consideration to a convenient method of field inspection for the measurement of the thickness of metal plate of which only one side is readily accessible, i. e. various gas cylinders, high pressure reaction vessels and gas tanks etc., In the first place, the writer has treated a problem on the three dimensional flow of the magnetic flux penetrating into a metal plate, when the steady or alternating magnetomotive force is supplied between two points on its surface, and the results obtained by mathematical calculations were verified by the some fundamental experiments. In the practical applications, however, for the effect of the contact resistance between the pole piece of the magnetic yoke and the surface of the methal plate under test a more accurate discussion will be required. The difficulty that this effect would vitiate the reading obtained will be overcome by a practical device described in later section.
東北大学の論文