公开(公告)号：US20150338376A1

公开(公告)日：2015-11-26

申请号：US14646816

申请日：2013-11-19

Applicant: UNIVERSITEIT TWENTE

Inventor： Sebastiaan WAANDERS ,  Martijn VISSCHER ,  Tasio Olmo Borendissi ODERKERK ,  Hendrikus Johannes Gradus KROOSHOOP ,  Bernard HAKEN

IPC: G01N27/72 ,  G01R33/16

CPC classification number: G01N27/72 ,  G01N27/76 ,  G01R33/0017 ,  G01R33/16

Abstract: Method and apparatus for measuring an amount of superparamagnetic material in an object, the method including a) applying a magnetic field having a first component alternating with a first period to the object and 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; 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.

Abstract translation: 用于测量物体中的超顺磁性材料的量的方法和装置，该方法包括：a）将具有与第一周期交替的第一分量的磁场施加到物体，并且磁场强度低于磁场强度，其中超顺磁性 材料驱动饱和; b）用检测线圈测量物体的第一磁化率; c）在等于或大于第一周期的第二周期中将静态第二分量施加到磁场，第二周期期间的磁场强度使得超顺磁材料被驱动朝向饱和; d）在施加静态第二部件期间用检测线圈测量物体的第二磁化率; 以及e）根据测量的第一和第二敏感性之间的差异确定超顺磁性材料的量。