Method and apparatus for determining concentration of magnetic s

Details Method and apparatus for determining concentration of magnetic s Method and apparatus for determining concentration of magnetic s

1998-03-26

2000-07-04

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Fluid material examination

324239, 23 6142, G01R 3312, G01R 33035, G01N 2774, G01N 2782

Patent

active

060843993

ABSTRACT:
Method and apparatus for determining concentration of a trace of contaminant magnetic substances contained in a non-magnetic substance. A magnetic field (3) is applied to the non-magnetic substance (1) from outside a duct (2) through which the non-magnetic substance is advanced so that magnetic substances contained in the non-magnetic substance are magnetized. At a downstream in the duct, an intensity of magnetic field produced substantially only by the magnetized magnetic substance is detected by a magnetic sensor (8) having a superconducting quantum interference device (SQUID).

REFERENCES:
patent: 4243059 (1981-01-01), Hammon et al.
patent: 5305751 (1994-04-01), Chopp et al.
Research Disclosure, XP-002069897 pp. 441 (1986).
Derwent Publication, XP-002069898 (No Date).
Patent Abstract of Japan, 03 073824 (1991).
Patent Abstract of Japan, 60 006850 (1985).
Cochran, "Squids for NDT; The Technology and its Capabilities" British Journal of Non-Destructive Testing 35:173-182 (1993).

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