Apparatus for electromagnetically detecting flaws in metallic ob

Details Apparatus for electromagnetically detecting flaws in metallic ob Apparatus for electromagnetically detecting flaws in metallic ob

1982-07-19

1985-03-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324233, 324237, 324240, G01N 2782, G01R 3312

Patent

active

045076103

ABSTRACT:
Nondestructive method of electromagnetically detecting flaws in a metallic object, comprising: placing an object to be tested for flaws adjacent a sensing head which comprises a portion of a sensor ring made of electrically conductive material and arranged inside an electromagnetic coupling coil excited by a high frequency current; causing the object and the sensing head to move relative to each other so that a flaw in the object causes the impedance of the coil to change; and detecting the change of the impedance.
An apparatus for carrying out the method is also provided.

REFERENCES:
patent: 2467306 (1949-04-01), Habig
patent: 3361960 (1968-01-01), Renken et al.
patent: 3694735 (1972-09-01), Mester
patent: 3723860 (1973-03-01), Loulya et al.
patent: 3872379 (1975-03-01), Brooks et al.
patent: 4286216 (1981-08-01), Auld et al.

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