Inductive Magnetic Sensor Noise Separation for Wider Bandwidth
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Solution Overview
Problem
Inductive magnetic field sensors are limited by high-frequency and low-frequency band noise, which restrict their working bandwidth.
Innovation Solution
Optimize the magnetic core by determining the functional relationship between induced voltage and effective permeability, modifying the core with vacuum magnetic-field annealing, and constructing a dual-channel composite multi-stage modulation signal-noise separation circuit to separate low-frequency and high-frequency noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional inductive magnetic field sensors are used, then the sensor can measure magnetic field changes, but the working bandwidth is limited due to high-frequency and low-frequency band noise
Solution Approach 1:
The patent divides the frequency spectrum into low-frequency and high-frequency bands and applies different noise suppression strategies to each segment. A dual-channel composite multi-stage modulation signal-noise separation circuit is constructed, with one channel for low-frequency signal processing and another for high-frequency signal processing, allowing independent optimization of noise suppression for each frequency band.
Solution Approach 2:
The patent introduces a magnetic core as an intermediary component between the coil and the magnetic field signal. The magnetic core undergoes vacuum magnetic-field annealing treatment to reduce its temperature variation-induced permeability noise, which acts as a mediator to suppress noise while allowing the magnetic field signal to pass through.
2Object-affected harmful factors
If the magnetic core is modified through vacuum magnetic-field annealing, then the temperature variation-induced permeability noise is reduced, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies vacuum magnetic-field annealing treatment to the magnetic core before the core is assembled into the final sensor. This preliminary treatment pre-reduces the temperature variation-induced permeability noise in the magnetic core material, so that when the sensor operates under varying temperature conditions, the noise is already suppressed. The annealing process is performed in advance during manufacturing, and the treated core is then used in the sensor assembly.
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 inductive magnetic field sensor achieves high sensitivity and low noise across a broad band, with characteristics suitable for a wider range of applications.
Implementation Method 1
An inductive magnetic field sensor is a type of sensor that may measure magnetic field changes using Faraday's law of electromagnetic induction
Implementation Method 2
performing a vacuum magnetic-field annealing at a set temperature on the magnetic core while maintaining the effective permeability of the magnetic core to adjust an anisotropy of the magnetic core material and reduce internal structural defects
Data Source
AI summary
The present disclosure provides a method for optimizing a broadband noise of an inductive magnetic field sensor as well as a magnetic field sensor, including: determining a functional relationship between an induced voltage of a coil and an effective permeability of a magnetic core of the inductive magnetic field sensor; determining an equivalent voltage noise expression of a temperature variation-induced permeability noise of the magnetic core according to the functional relationship; determining a key influencing factor of the magnetic core according to the equivalent voltage noise expression of the temperature variation-induced permeability noise of the magnetic core; modifying the magnetic core according to the key influencing factor of the magnetic core to optimize the temperature variation-induced permeability noise of the magnetic core; and constructing a dual-channel composite multi-stage modulation signal-noise separation circuit to optimize a low-frequency band noise and a high-frequency band noise of the inductive magnetic field sensor.