Apparatus for detecting and recording surface and internal flaws

Details Apparatus for detecting and recording surface and internal flaws Apparatus for detecting and recording surface and internal flaws

1977-04-26

1979-03-27

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324227, 324232, 324238, G01R 3312

Patent

active

041468376

ABSTRACT:
The proposed structural flaw detector is intended for nondestructive testing of continuously moving electrically conducting products, e.g. aluminum, copper and other rods, and comprises two eddy current transducers spaced apart along the path of movement of the products being monitored. One of these transducers is a high-frequency one and is mounted first to detect flaws on the surface, while the other transducer is a low-frequency one and is mounted downstream of the first one to detect structural flaws occurring at a depth under the surface.
Arranged between the measuring channels of these transducers is a gating unit blocking the channel of the low-frequency transducer when a surface flaw is detected.

REFERENCES:
patent: 1946196 (1934-02-01), Drake et al.
patent: 2729785 (1956-01-01), Keevil
patent: 3290167 (1966-12-01), Wood et al.
patent: 3340466 (1967-09-01), Ono

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