- Patent Title: Magnetic permeability sensor and magnetic permeability detecting method, dielectric permittivity sensor and dielectric permittivity detecting method, and magnetic permeability and dielectric permittivity sensor and magnetic permeability and dielectric permittivity detecting method
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Application No.: US14744876Application Date: 2015-06-19
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Publication No.: US10295618B2Publication Date: 2019-05-21
- Inventor: Kazuhiko Osumi , Yuuzo Maruyama , Osamu Shimoe
- Applicant: Hitachi Metals, Ltd.
- Applicant Address: JP Tokyo
- Assignee: Hitachi Metals, Ltd.
- Current Assignee: Hitachi Metals, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Muncy, Geissler, Olds & Lowe, P.C.
- Priority: JP2014-191360 20140919; JP2015-056619 20150319; JP2015-84419 20150416
- Main IPC: G01R33/12
- IPC: G01R33/12 ; G03G15/08
Abstract:
Each of the oscillation frequency of a first oscillation circuit performing oscillation in a state of including a coil and a capacitor and the oscillation frequency of a second oscillation circuit performing oscillation in a state of including a coil and a capacitor different from the coil and the capacitor of the first oscillation circuit is measured. Then, the difference of the measured oscillation frequencies is calculated and then the calculated difference is converted into a magnetic permeability or a dielectric permittivity. One sensor selectively detects a change in the magnetic permeability or a change in the dielectric permittivity of a subject material.
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