METHOD AND APPARATUS FOR MEASURING AN AMOUNT OF SUPERPARAMAGNETIC MATERIAL IN AN OBJECT

The invention relates to a method and apparatus for measuring an amount of superparamagnetic material in an object comprising, the method comprising a) applying a magnetic field comprising a first component alternating with a first period to the object and having a magnetic field strength lower than...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HAKEN, BERNARD, WAANDERS, SEBASTIAAN, KROOSHOOP, HENDRIKUS JOHANNES GRADUS, VISSCHER, MARTIJN, ODERKERK, TASIO OLMO BORENDISSI
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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Beschreibung
Zusammenfassung:	The invention relates to a method and apparatus for measuring an amount of superparamagnetic material in an object comprising, the method comprising a) applying a magnetic field comprising a first component alternating with a first period to the object and having a magnetic field strength lower than a magnetic field strength at which the superparamagnetic material is driven in saturation; b)measuring a first magnetic susceptibility of the object with a detection coil; c) applying a static second component to the magnetic field for a second period being equal or larger than the first period, the strength of the magnetic field during the second period is such that the superparamagnetic material is driven towards saturation; and d) measuring a second magnetic susceptibility of the object with the detection coil during the application of the static second component; and e) determining the amount of superparamagnetic material from a difference between the measured first and second susceptibility of the object.