Method and apparatus for detecting defects in workpieces using a

Details Method and apparatus for detecting defects in workpieces using a Method and apparatus for detecting defects in workpieces using a

1978-05-25

1980-06-10

Rolinec, Rudolph V.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324238, G01R 3300, H01L 4300

Patent

active

042075190

ABSTRACT:
A method is proposed by which defects in workpieces are detected magnetically, which method comprises the following steps being performed concurrently: scanning the test surface of a workpiece utilizing magneto-sensitive elements; magnetizing the workpiece perpendicularly to its test surface in the test zone; exciting magneto-sensitive elements; and measuring the tangential component of the magnetic field strength in the test zone. An apparatus for magnetically detecting defects in workpieces according to the proposed method comprises an electrical signal excitation/measuring unit and a detector. The latter has a housing which accommodates a core-type magnet rigidly fixed to it and adapted to be magnetized prependicularly to its working surface which mounts magneto-sensitive elements separated from each other and oriented in a prescribed manner. The elements connect each other and the electrical signal excitation/measuring unit as well.

REFERENCES:
patent: 3359495 (1967-12-01), McMaster et al.
patent: 3846697 (1974-11-01), Cila et al.
Shiraiwa et al. An Automatic Magnetic Inspection Method Using Magnetoresistive Elements, Mat. Encl., May 1973, pp. 90-96.

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