Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1984-10-11
1986-10-21
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324262, G01B 710, G01R 3312
Patent
active
046188258
ABSTRACT:
An electro-magnetic thickness measuring probe has a pot core which has a central bore, a pot chamber coaxial to the central bore accommodating a winding, and a pot rim. A pole-piece has one end fixed into the central bore and a free front-face with a coaxial recess machined therein such that an outer shell remains around the recess. A hard-metal pin is seated in the recess and has a front-face forming a crowned contact surface which stands a little proud of the pot rim. A coaxial annular disk made of highly permeable magnetic material has an outer edge in contact with the pot rim, a non-magnetic slot, and an intrados-radius surface having a diameter greater than the diameter of the pole-piece but significantly smaller than the diameter of the pot chamber. The intrados-radius surface lies close to the front-face of the pole-piece, whereby the magnetic resistance between the intrados-radius surface and the outer shell is significantly greater than the magnetic resistance between the intrados-radius surface and the free front-face when the measuring probe is set down on a surface.
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Edmonds Warren S.
Kestenbaum M. R.
Strecker Gerard R.
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