Planar Waveguide Permeability Measurement Jig for Magnetic Fine Particles
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Solution Overview
Problem
Existing methods for measuring high-frequency permeability of magnetic fine particles face challenges in sensitivity, particularly at lower frequencies, due to reduced counter electromotive force generation and difficulty in miniaturizing measurement setups, leading to reduced measurement sensitivity and signal-to-noise ratio.
Innovation Solution
A permeability measurement jig comprising a first waveguide with an excited magnetic part and a second waveguide with a detection part, both miniaturized and positioned to face each other, allowing for improved sensitivity by generating and detecting magnetic fields across a wide frequency range, with the power level of the excitation signal adjusted to enhance signal quality at lower frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a shielded loop coil is disposed in a TEM cell for permeability measurement, then measurement can be performed, but the TEM cell cannot be miniaturized leading to reduced measurement sensitivity
Solution Approach 1:
The patent replaces the traditional TEM cell mechanical structure with a planar waveguide structure that has a flattened profile. The measurement function is maintained by using a planar configuration where the magnetic material is placed between two planar waveguides, eliminating the need for a bulky three-dimensional TEM cell while preserving the measurement capability through electromagnetic field interaction in a planar geometry.
Solution Approach 2:
The invention transitions from a three-dimensional TEM cell structure to a two-dimensional planar waveguide structure. By flattening the measurement setup into a planar configuration, the device achieves miniaturization in the vertical dimension while maintaining measurement functionality through the horizontal plane, effectively solving the size-sensitivity contradiction.
2Measurement precision
If transmission coefficient or reflection coefficient methods are used for permeability measurement, then measurement can be performed, but counter electromotive force is reduced at lower frequencies making signal separation difficult
Solution Approach 1:
The patent introduces a planar waveguide structure as an intermediary between the signal source and the magnetic material. This planar configuration acts as a mediator that enhances the interaction between the electromagnetic field and the magnetic material, improving counter electromotive force generation and signal separation capability, particularly at lower frequencies where traditional methods fail.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances measurement sensitivity and maintains a consistent signal-to-noise ratio across the entire frequency range, effectively addressing the limitations of previous methods by allowing for precise measurement of fine magnetic powder substances with improved accuracy at lower frequencies.
Implementation Method 1
a magnetic field is generated at the excited magnetic part by an excitation signal
Implementation Method 2
a detection signal is induced at the detection part due to an action of the magnetic field generated at the excited magnetic part to a measurement sample
Data Source
AI summary
In the present disclosure, there is provided a permeability measurement jig including a first waveguide, wherein a signal line of the first waveguide comprises an excited magnetic part at one end side, and a magnetic field is generated at the excited magnetic part by an excitation signal, and a second waveguide, wherein a signal line of the second waveguide comprises a detection part at one end side, a detection signal is induced at the detection part due to an action of the magnetic field generated at the excited magnetic part to a measurement sample, and the detection part is placed on the excited magnetic part to face the excited magnetic part at a predetermined distance. A permeability measurement device having the permeability measurement jig and a permeability measurement method are disclosed.