Single magnetic stray field sensor whose signals are differently

Details Single magnetic stray field sensor whose signals are differently Single magnetic stray field sensor whose signals are differently

1977-03-23

1978-09-26

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

G01R 3312

Patent

active

041174038

ABSTRACT:
The described tube testing apparatus indicates whether a defect is either external or internal, enabling a quantitative classification of defects and an analog representation on location of the defect in the tube wall. The ratio of the signal levels of a defect is taken as a threshold in two different circuit channels. For tubes of a given wall thickness, the ratio of the defect signal levels resulting in the two channels is a fixed number which is a function of the location of a defect in the tube wall causing a defect signal. Uninfluenced test signal voltages from the first channel are available for further evaluation and are applied to voltage discriminators having various threshold voltages. Since the signal levels for external and internal defects are different, this may be effected separately for external and internal defects, offering the possibility for defect classification adapted to the respective requirements, for example, into large, medium or small external defects, or large, medium or small internal defects.

REFERENCES:
patent: 2925552 (1960-02-01), Cowan et al.
patent: 3271664 (1966-09-01), Mountz et al.
patent: 3343079 (1967-09-01), Crouch
patent: 3538433 (1970-11-01), Wood et al.

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