Method and apparatus for magnetically detecting a carburized por

Details Method and apparatus for magnetically detecting a carburized por Method and apparatus for magnetically detecting a carburized por

1990-10-02

1992-04-14

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324225, 324243, G01R 3312, G01N 2772

Patent

active

051051516

ABSTRACT:
An apparatus for measuring a carburized portion occurring in inside of a tubular article, the apparatus comprising a first detecting unit having opposite magnetic poles of a first magnet arranged in parallel to an inspecting face of a case made of nonmagnetic material and a magnetism detector disposed at an intermediate portion between the poles, a second detecting unit having opposite magnetic poles of a second magnet arranged perpendicular to the inspecting face of the case and a magnetism detector provided for one of the poles of the second unit, and a data processing circuit for processing the output signals from the first and second detecting units to produce a difference signal. An influence on the magnetic flux density due to the presence of the carburized portion occurring in inside of the tubular article can be determined by a method comprising the steps of measuring a variation in the magnetic flux density effected from both a deteriorated portion and a carburized portion, each of the portions having high permeability of magnetism, with use of the first detecting unit, measuring a variation in the density of magnetic flux due to the presence of the deteriorated layer by using the second detecting unit, and producing a signal representing the difference between the outputs of the first and second detecting units.

REFERENCES:
patent: 3579099 (1971-05-01), Kanbayashi

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