发明名称 |
Method and apparatus for measurement of magnetic permeability of a material |
摘要 |
A system for determining the magnetic permeability of a material is provided. Two electrical inductors formed as primary and secondary concentric coils share a common magnetic core space. An AC voltage applied to the primary coil creates a magnetic flux in the core proportional to the magnetic permeability of a sample of the material positioned within the core space. The magnetic flux induces an AC voltage in the secondary coil indicative of the sample magnetic permeability. When the material is a magnetorheological fluid, the magnetic permeability is proportional to the concentration of magnetic particles in the sample and can be back-calculated from the amplitude of the secondary voltage signal. Sensitivity and resolution can be increased by using two identical sets of coils wherein a reference material forms a core for the primary set and the MR fluid sample forms a core for the secondary set.
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申请公布号 |
US7557566(B2) |
申请公布日期 |
2009.07.07 |
申请号 |
US20070681258 |
申请日期 |
2007.03.02 |
申请人 |
QED TECHNOLOGIES INTERNATIONAL, INC. |
发明人 |
KORDONSKI WILLIAM;SEKERES ARPAD;JAMES ROBERT |
分类号 |
G01N27/74;G01B7/00 |
主分类号 |
G01N27/74 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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