MEASUREMENT OF PARTICLE CONCENTRATION IN A STREAM

The invention relates to determining a concentration of magnetic particles in a stream of fluid mixed with the particles through an elongate circumferential enclosure at an axial measurement location along the stream. Use is made of a coil with multiple electrically conducting windings arranged to e...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	BLANGE, Jan Jette
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL ORCHEMICAL PROCESSES EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROMSOLID MATERIALS OR FLUIDS MEASURING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERFORMING OPERATIONS PHYSICS SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS TESTING TRANSPORTING
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Beschreibung
Zusammenfassung:	The invention relates to determining a concentration of magnetic particles in a stream of fluid mixed with the particles through an elongate circumferential enclosure at an axial measurement location along the stream. Use is made of a coil with multiple electrically conducting windings arranged to each tangentially surround the stream at the axial measurement location, for generating a magnetizing field which extends with a radially inwards part thereof inside the stream and with a radially outwards part thereof outside the stream, and of a sensor configured for producing a signal indicative of a magnetic flux density caused by the magnetizing field generated around the coil and/or a change therein. An electromagnetic permeability in the magnetizing field is increased in in the radially inwards part of the magnetizing field by a particle directing tool directing the particles in the stream radially outwardly towards an inner circumference of the coil, and/or in the radially outwards portion of the magnetizing field, by magnetically conducting elements extending along a path around the coil windings so as to guide field lines of the magnetizing field therethrough.