Apparatus with cancel coil assembly for cancelling a field paral

Details Apparatus with cancel coil assembly for cancelling a field paral Apparatus with cancel coil assembly for cancelling a field paral

1994-03-15

1996-07-16

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324248, 324225, G01N 2782, G01N 2772, G01R 3302

Patent

active

055370373

ABSTRACT:
A nondestructive inspecting apparatus is arranged to have an exciting magnet for applying an ac magnetic field to a sample and a SQUID for converting change of a magnetic characteristic of the sample occurring when the ac magnetic field is applied to the sample into an electric signal. The exciting magnet is a cancelled coil assembly composed of plural coils having respective polarities.

REFERENCES:
patent: 4277750 (1981-07-01), Bonnet et al.
patent: 4926127 (1990-05-01), Auslaander et al.
patent: 5004724 (1991-04-01), De
patent: 5124648 (1992-06-01), Webb et al.
patent: 5134368 (1992-07-01), Otaka et al.
patent: 5331278 (1994-07-01), Evanson et al.
patent: 5367259 (1994-11-01), Matsumoto et al.

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