Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1991-03-22
1992-05-12
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324202, 324235, 324262, 505726, 505843, G01R 3312, G01N 2772
Patent
active
051131358
ABSTRACT:
The area of a loop made of superconducting material is decreased to incre the magnetic field on the surface of a test piece adjacent the loop for determining the critical field, H.sub.c, of the test piece. A loop with a gap having a temporary plug placed therein in which a persistent current is established has a nozzle forming the gap thereon for receiving a test piece. The test piece then completes the circuit permitting removal of the temporary plug. The area of the loop is then decreased resulting in an increase in magnetic field at the surface of the test piece. When the critical field of the test piece is reached, magnetic flux will leak from the internal area of the loop, thereby determining the critical field of the test piece. A continuous length of superconducting material can be tested for discontinuities or spots of low critical field, H.sub.c.
REFERENCES:
patent: 3626344 (1971-12-01), Shaternikov et al.
patent: 4414507 (1983-11-01), Chen
patent: 4864236 (1989-09-01), Gibson et al.
patent: 4901017 (1990-02-01), Zinke
Anderson William H.
Strecker Gerard R.
The United States of America as represented by the Secretary of
Zelenka Michael
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