Stability method and apparatus for nondestructive measure of mag

Details Stability method and apparatus for nondestructive measure of mag Stability method and apparatus for nondestructive measure of mag

1994-02-14

1996-11-12

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Fluid material examination

73 5301, 73 6142, G01N 2774, G01R 3312

Patent

active

055743633

ABSTRACT:
In order to measure the magnetic saturation flux density of a sample material, a first and a second sample holder are symmetrically positioned on the same side of a cylindrical permanent magnet. Coils are placed around the sample holders and the cylindrical permanent magnet is rotated. The signals induced in the coils in the absence of a magnetic material in one of the sample holders are applied to an amplifier in such a manner as to provide a null input signal. When a sample is placed in one of the sample holders, the magnetic saturation flux density can be measured. The present device finds particular application to determining the concentration of a magnetic particles dispersed in a (coating) fluid. The fluid can flow through a sample holder for measurement. In addition, a reference fluid can flow through the second sample holder for better process control. The geometry of the sample holder carrying a fluid material is specified to increase the accuracy of the measurements.

REFERENCES:
patent: 3777561 (1973-12-01), Lewis
patent: 4522501 (1985-06-01), Shannon
patent: 4651092 (1987-03-01), Brunsch et al.
patent: 4808922 (1989-02-01), Eder et al.
patent: 5089781 (1992-02-01), Arichika et al.
patent: 5287056 (1994-02-01), Jackson et al.

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