Nondestructive testing system using a SQUID

Details Nondestructive testing system using a SQUID Nondestructive testing system using a SQUID

1994-10-19

1998-10-20

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324225, G01N 2787, G01R 33035

Patent

active

058251820

ABSTRACT:
In order to enhance the sensitivity of a nondestructive testing system, a pair of superconducting coils are disposed in the same plane such that a current flowing through the respective coils when exposed to a uniform magnetic field cancels out. As a result of this configuration, the detection coils are immune to noise, offset fields or other uniform ambient phenomena. In one embodiment, the nondestructive testing unit includes a plurality of detection coils, a SQUID having a pair of connectors for connection to the detection coils, a probe for supporting the detection coils and the SQUID in a coolant, a cryostat for supporting the probe and for keeping the coolant constant, a controller for processing a signal transmitted from the SQUID, and a display device for displaying the result of the processing. At least two detection coils are disposed in the same plane, are directly connected to the SQUID and are integrated on a semiconductor substrate.

REFERENCES:
patent: 3422346 (1969-01-01), Hammer
patent: 3611120 (1971-10-01), Forster
patent: 4639674 (1987-01-01), Rippingale
patent: 5289121 (1994-02-01), Kajola et al.
patent: 5293119 (1994-03-01), Podney
patent: 5331278 (1994-07-01), Evanson et al.

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