Rotating Electromechanical Modulator for Magnetoresistive Probe Noise Reduction
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Solution Overview
Problem
Magnetoresistive sensors face challenges with high 1/f noise at low frequencies and increased complexity and size in existing high frequency magnetic signal measurement devices.
Innovation Solution
A magnetoresistive magnetic field probe with a rotating electromechanical modulator, comprising a bulk cylindrical base, magnetic tiles, and a magnetoresistive sensor, which modulates an external magnetic field into a high frequency sensed magnetic field, reducing noise and simplifying the measurement structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetoresistive sensors are used for low frequency magnetic signal measurement, then the measurement capability is provided, but high 1/f noise is generated reducing measurement accuracy
Solution Approach 1:
The patent applies periodic action by rotating the cylindrical base with magnetic tiles at a specific frequency to modulate the magnetic field. This periodic rotation converts the static or low-frequency magnetic field into an AC signal at the rotation frequency, effectively moving the measurement from the low-frequency region (with high 1/f noise) to a higher frequency region where thermal noise dominates and is lower in density, thereby improving measurement accuracy
Solution Approach 2:
The patent employs dynamics by introducing a rotating cylindrical base with magnetic tiles that can rotate at controlled frequencies. This dynamic structure modulates the external magnetic field through rotational motion, transforming the measurement problem from a static low-frequency challenge to a dynamic high-frequency solution where noise characteristics are more favorable
2Object-affected harmful factors
If existing high frequency magnetic signal measurement devices are used, then the 1/f noise is reduced, but the complexity and size of the sensor increase greatly
Solution Approach 1:
The patent merges multiple functions into a single integrated structure: the cylindrical base serves as both the rotating platform and the magnetic field modulation element through attached magnetic tiles. This combination eliminates the need for separate modulation mechanisms and sensors, achieving high-frequency measurement capability while maintaining simple structure and reducing overall device complexity
Solution Approach 2:
The cylindrical base with magnetic tiles serves multiple functions: it provides structural support, generates the rotating magnetic field for modulation, and acts as the measurement platform. This multi-functional design avoids the need for additional dedicated components, thereby reducing device complexity while achieving noise reduction
3Object-affected harmful factors
If existing high frequency magnetic signal measurement devices are used, then the 1/f noise is reduced, but the size of the sensor increases
Solution Approach 1:
The magnetic tiles are attached to the outer surface of the cylindrical base, utilizing the existing structural volume efficiently. The magnetoresistive sensor is positioned at the center axis within the cylindrical structure. This nested arrangement maximizes the use of available space and achieves the measurement function without requiring additional external components that would increase overall sensor size
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 solution achieves a superior signal-to-noise ratio in measuring external magnetic fields, reduces the complexity and size of the sensor, and lowers production costs while maintaining accurate magnetic field measurements.
Implementation Method 1
a magnetoresistive sensor and a reference signal generator located on the center axis of the bulk cylindrical base
Data Source
AI summary
A magnetoresistive magnetic field probe with rotating electromechanical modulator (1) comprises: a bulk cylindrical base (11), wherein the bulk cylindrical base (11) has a cavity structure, and a center axis of the bulk cylindrical base (11) overlaps with a z-axis of a cylindrical coordinate system; a first magnetic tile (12) and a second magnetic tile (13) attached to an outer side wall of the bulk cylindrical base (11); and a magnetoresistive sensor (14) and a reference signal generator (15) located on the center axis of the bulk cylindrical base (11). During operation, the bulk cylindrical base (11) rotates about the z-axis at a frequency f, and the first magnetic tile (12) and the second magnetic tile (13) modulate an external magnetic field into a sensed magnetic field having a frequency 2f, and a measurement signal having a frequency 2f is output via the magnetoresistive sensor (14). The reference signal generator (15) outputs a reference signal having a frequency 2f. The reference signal and the measurement signal are demodulated by an external processing circuit (4) to output a magnetic field value, so as to provide a measurement of the external magnetic field with superior signal-to-noise ratio. Through adding a detachable rotating sleeve to the magnetoresistive sensor (14), superior signal-to-noise ratio measurement of the external magnetic fields can be realized. This invention is small in size with a simple structure, and the complexity of the process is also greatly reduced, enabling lower cost.