Browse Prior Art Database

Device for Measurement of Characteristics of a Magnetic Particle Composition With Use of a Known Reference Sample

IP.com Disclosure Number: IPCOM000061909D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Coufal, H: AUTHOR [+3]

Abstract

The particle density, dispersion and viscosity of a resin/solvent composition including magnetic particles can be measured, and the measurement automatically calibrated if the measuring device also simultaneously measures the characteristics of a known reference sample.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 1

Device for Measurement of Characteristics of a Magnetic Particle Composition With Use of a Known Reference Sample

The particle density, dispersion and viscosity of a resin/solvent composition including magnetic particles can be measured, and the measurement automatically calibrated if the measuring device also simultaneously measures the characteristics of a known reference sample.

A typical device for measuring the magnetic characteristics (such as particle density, dispersion or viscosity) of a resin/ solvent composition containing magnetic particles is shown in the figure and includes a vessel 1 containing the unknown sample surrounded by a coil 5.

The coil arrangement 2 consists of two field coils 3 and 4 which generate an energizing alternating magnetic field, a measuring coil 5 and a compensating coil
6. The compensating coil 6 is identical to measuring coil 5 but does not surround the vessel 1 containing the composition to be measured. Instead, compensating coil 6 surrounds a vessel 12 which contains a reference sample whose particle dispersion, viscosity or particle density is known. The two coils 5 and 6 are placed symmetri- cally in the field configuration generated by the two coils 3 and
4. The influence of the energizing field of coils 3 and 4 on the measuring results is eliminated from the measuring results by the compensating coil 6, which is wired in the opposite direction and contains the same number of turns as the measuring coil 5. The measuring coil 5 is connected to the compensating coil 6, and to an amplifier 7 and...