Non-destructive testing equipment employing SQUID-type magnetic

Details Non-destructive testing equipment employing SQUID-type magnetic Non-destructive testing equipment employing SQUID-type magnetic

1994-07-11

1998-03-17

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324235, 324225, G01N 2790, G01N 2782, G01R 33035, G01R 3312

Patent

active

057291357

ABSTRACT:
A non-destructive testing equipment comprises a magnetic sensor located within a magnetic shield container. The magnetic sensor includes a SQUID that is a magnetic sensor having a very high sensitivity. A magnetically uniform inspection zone is formed in the magnetic shield container. While a rod-like material to be tested passes through the inspection zone at a uniform velocity, the magnetic sensor can detect an appreciable magnetic field variation that is caused by impurities or minor defects contained in the object to be tested.

REFERENCES:
patent: 4734643 (1988-03-01), Bubenik et al.
patent: 4864233 (1989-09-01), Harrison
patent: 5004724 (1991-04-01), De
patent: 5109196 (1992-04-01), Wikswo, Jr. et al.
IEE Proceedings A., vol. 140, No. 2, Mar. 1993.
Proceedings of the IEEE 77(1989) Aug., No. 8, New York, NY.
Soviet Journal of Nondestructive Testing, vol. 22, No. 3, Mar. 1986, New York.
British Journal of Non-Destructive Testing, vol. 35, No. 4, Apr. 1993.
Cryogenics, Aug. 1989, No. 8, "Biomagnetic Multichannel System with Integrated SQUIDs and First Order Gradiometers Operating in a Shielded Room" pp. 809-813.

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