Nondestructive inspection apparatus with superconducting magneti

Details Nondestructive inspection apparatus with superconducting magneti Nondestructive inspection apparatus with superconducting magneti

1996-08-16

1998-11-10

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324224, 324235, 324241, 324262, 324263, 324750, 324760, 505846, G01R 33035, G01R 3128, G01N 2782

Patent

active

058349383

ABSTRACT:
To provide a nondestructive inspection apparatus with a reduced distance between a superconducting magnetic sensor and an object under inspection, a cryostat for cooling the sensor to a superconducting state is provided with inner and outer vessels. The inner vessel has a baseplate on which the magnetic sensor is disposed, and has an inner wall defining a central chamber for containing a refrigerant for cooling the magnetic sensor. The outer vessel has an inner wall defining a central chamber for containing the inner vessel, the magnetic sensor and the stage. A gap between the inner and outer vessels is evacuated to insulate the inner chamber from the ambient atmosphere. To facilitate ease of transferring an object to and from the stage for inspection, a load lock area is provided adjoining the outer vessel. The load lock has a movable inner wall portion opening to the inner chamber of the outer vessel and a movable outer wall portion opening to the ambient atmosphere so as to permit the transfer of an object to be inspected to and from the stage.

REFERENCES:
patent: 4079730 (1978-03-01), Wikswo, Jr. et al.
patent: 4827217 (1989-05-01), Paulson
patent: 5134368 (1992-07-01), Otaka et al.
patent: 5491411 (1996-02-01), Wellstood et al.
Pelizzone et al; A SQUID Susceptometer for Fields up to 8.5 Tesla, Appl. Phys. 24, No. 4, Apr. 1981, pp. 375-379.

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