Method and apparatus for eddy curent non-destructive examination

Details Method and apparatus for eddy curent non-destructive examination Method and apparatus for eddy curent non-destructive examination

1990-02-20

1992-06-02

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324220, 324242, 324243, G01N 2772, G01R 3312

Patent

active

051190230

ABSTRACT:
A method and apparatus for non-destructively examining cylindrical material by electromagnetic induction use primary coils separated by an annular gap. The primary coils are excited oppositely so that the respective magnetic fields thereby generated are in boosting relationship in the gap. Close electromagnetic coupling of the primary coils with the material under examination is effected, and detectors, such as secondary coils are disposed in the gap to detect flux perturbations caused by variation in the properties of the material under examination.

REFERENCES:
patent: 2555853 (1951-06-01), Irwin
patent: 3875502 (1975-04-01), Neumaier
patent: 4742298 (1988-05-01), Ando et al.

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