Method and device for determining the homogeneity of magnetic dispersions

US4243059A · kind A · utility

Assignee

• BASF SE

Inventors

• Fritz Hammon · Bischofswerda, DE
• Manfred Ohlinger · Bischofswerda, DE
• Job-Werner Hartmann · Ludwigshafen, DE

Key dates

• Filing date: May 22, 1978
• Grant date: Jan 6, 1981
• Expiry date: May 22, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/2579
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In order to determine the homogeneity of a magnetic dispersion, part of the dispersion is conducted through a measuring cell prior to its application to a base, the size, number and type of those regions of the magnetic dispersion which interfere with the homogeneity being determined with the aid of magnetic measurements. The measuring cell contains a magnetic head, a magnetic dispersion is made to flow in a stream of constant cross section past the air gap of the magnetic head, and a magnetic field at least partially penetrating the magnetic dispersion is produced. From the characteristics of the amplified output voltage of the magnetic head the various parameters of the inhomogeneities in the magnetic dispersion can then be ascertained.