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

摘要

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.

主权项

1. A magnetic permeability sensor detecting a magnetic permeability of a subject material, comprising:
a first oscillation circuit performing oscillation in a state of including a first coil receiving magnetism from the subject material; a second oscillation circuit performing oscillation in a state of including a second coil receiving magnetism from the subject material; a measurement part measuring an oscillation frequency in each of the first oscillation circuit and the second oscillation circuit; a calculation part calculating a difference of the oscillation frequencies measured by the measurement part; and a conversion part converting the difference calculated by the calculation part into a magnetic permeability.