Magnetic Sensor Device Self-Calibration via Integrated Field Generators
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Solution Overview
Problem
Magnetic sensor devices face challenges in precisely measuring main- and cross-axis sensitivities due to misalignment and environmental factors, leading to inaccurate detection signals, especially when trying to input linearly independent magnetic field vectors for correction coefficient generation.
Innovation Solution
A magnetic sensor device with integrated first and second magnetic field generators, capable of generating additional magnetic fields, allows for precise measurement of main- and cross-axis sensitivities by applying these fields to magnetic sensors mounted on a support with a reference plane, ensuring accurate detection signal correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetic sensors are mounted on a support with reference to sensor coordinate systems, then the device can detect magnetic field components in multiple directions, but misalignment between sensor coordinate systems and reference coordinate system occurs due to manufacturing tolerances and environmental factors
Solution Approach 1:
A reference coordinate system is introduced as an intermediary between the support and the sensor coordinate systems. This reference coordinate system serves as a common reference frame that allows for the measurement and correction of misalignments between individual sensor coordinate systems and the overall device coordinate system, thereby resolving the contradiction between multi-directional detection capability and alignment precision.
2Measurement precision
If correction coefficients are generated using linearly independent magnetic field vectors from external sources, then main- and cross-axis sensitivities can be measured, but it becomes difficult to input these vectors precisely due to environmental constraints
Solution Approach 1:
The magnetic sensor device performs self-calibration by generating its own linearly independent magnetic field vectors using integrated magnetic field generators. This eliminates the need for external sources and manual input of magnetic field vectors, allowing the device to autonomously measure its own main- and cross-axis sensitivities while maintaining measurement precision.
Solution Approach 2:
Magnetic field generators are pre-integrated with the magnetic sensors on the support before operation. This preliminary integration ensures that the magnetic field vectors can be reliably generated and applied to the sensors during the sensitivity measurement process, removing the operational difficulty of externally inputting these vectors.
3Measurement precision
If magnetic field generators are integrated with the support and magnetic sensors, then precise sensitivity measurement can be achieved, but device complexity increases
Solution Approach 1:
The support structure is designed to serve multiple functions simultaneously: it mechanically mounts the magnetic sensors, provides a reference coordinate system for alignment, and integrates magnetic field generators for sensitivity calibration. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving precise sensitivity measurement.
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 device enables precise measurement and correction of detection signals, improving the accuracy of magnetic field component detection across multiple axes, even in cases of misalignment and varying environments.
Implementation Method 1
a magnetic field generator capable of generating a magnetic field different from the external magnetic field
Data Source
AI summary
A magnetic sensor device includes a composite chip component, and a sensor chip mounted on the composite chip component. The sensor chip includes a first magnetic sensor, a second magnetic sensor, and a third magnetic sensor that detect components of an external magnetic field that are in directions parallel to an X direction, parallel to a Y direction, and parallel to a Z direction, respectively. The composite chip component includes a first magnetic field generator, a second magnetic field generator, and a third magnetic field generator for generating additional magnetic field components that are in directions parallel to the X direction, parallel to the Y direction, and parallel to the Z direction, respectively.