Magnetic Impedance Sensing with Frequency-Tuned Measurement Range
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Solution Overview
Problem
Magnetic sensors utilizing magnetic impedance elements have a limited range in which a magnetic field can be measured, necessitating effort to set an adequate measurement range.
Innovation Solution
A magnetic field measuring apparatus with a magnetic impedance element that adjusts its impedance change rate based on the frequency of a drive signal, allowing the measurement range to be set by varying the frequency, thereby expanding the measurable magnetic field range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic impedance element is used to measure magnetic fields, then the sensor can detect magnetic field changes, but the measurement range is limited and requires manual setting
Solution Approach 1:
The patent applies dynamics by making the measurement range adjustable through frequency modulation. The magnetic impedance element's operating characteristics change dynamically with the drive signal frequency, allowing the measurement range to be expanded or contracted based on the magnetic field strength being measured, thereby eliminating manual range setting requirements
Solution Approach 2:
The patent changes the operating parameter (frequency of drive signal) to control the measurement range. By varying the frequency, the magnetic impedance element's impedance characteristics change, which directly controls the measurable magnetic field range, enabling automatic adaptation to different measurement scenarios
2Measurement precision
If the frequency of the drive signal is increased, then the upper limit of measurable magnetic fields increases, but the maximum value of impedance change rate decreases
Solution Approach 1:
The patent deliberately changes the frequency parameter to control the trade-off between measurement range and sensitivity. By selecting appropriate frequencies, the system can optimize for either extended range or high sensitivity depending on the specific measurement requirements, making the parameter change a tool for performance tuning
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
The apparatus increases the upper limit of measurable magnetic fields and reduces impedance change rate fluctuations, enhancing sensitivity and reducing measurement effort.
Implementation Method 1
a magnetic impedance element with an impedance change rate that changes depending on the to-be-measured magnetic field
Data Source
AI summary
A magnetic field measuring apparatus for measuring a to-be-measured magnetic field includes a magnetic impedance element with an impedance change rate that changes depending on the to-be-measured magnetic field, a drive signal providing section and a measurement range setting section. The drive signal providing section provides a drive signal to the magnetic impedance element. A measurement range setting section sets a measurement range in which the to-be-measured magnetic field can be measured. A relationship between the to-be-measured magnetic field and the impedance change rate is arranged to change depending on a frequency of the drive signal. The measurement range setting section is arranged to set the measurement range by setting the frequency.