Magnetic Sensor Sensitivity Averaging for Stable Field Measurement
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Solution Overview
Problem
Existing sensitivity measurement methods for magnetic sensors, such as those described in Non-Patent Document 1, become complicated and may fail to converge due to the addition of weighting parameters, leading to inaccurate calculations.
Innovation Solution
A sensitivity measurement method that calculates the sensitivity of a magnetic sensor based on a simple average value of theoretical magnetic field strengths at evenly distributed virtual sensitivity points within the sensor's housing, reducing calculation complexity and maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If weighting parameters (relative sensitivity) are added to multiple sensitivity points for measurement accuracy, then measurement precision is improved, but device complexity and calculation difficulty increase significantly
Solution Approach 1:
The patent extracts and removes the complex weighting parameters (relative sensitivity) from the calculation model. By using only the magnetic field strength values at multiple sensitivity points without any weighting factors, the calculation becomes a simple average that is computationally straightforward while still providing accurate sensitivity measurements.
Solution Approach 2:
The patent changes the calculation parameters from a weighted sum model (requiring relative sensitivity values) to an unweighted average model. This parameter change eliminates the need for complex weighting calculations while maintaining measurement accuracy, directly resolving the contradiction between precision and complexity.
2Measurement precision
If weighting parameters are added to sensitivity points, then measurement precision may be improved, but reliability of convergence deteriorates as calculations may fail to converge
Solution Approach 1:
The patent removes the weighting parameters that cause convergence problems. By calculating sensitivity based solely on the average of magnetic field strengths at multiple points without any weighting factors, the calculation becomes numerically stable and reliably convergent while preserving measurement accuracy.
3Measurement precision
If complex weighting calculations are performed at multiple sensitivity points, then measurement precision is improved, but productivity decreases due to increased calculation time
Solution Approach 1:
The patent extracts and eliminates the computationally intensive weighting parameters from the sensitivity calculation. The simplified approach of averaging magnetic field strengths at multiple sensitivity points requires minimal computation, dramatically improving calculation efficiency while maintaining accurate sensitivity measurements.
Solution Approach 2:
The patent replaces the complex mechanical calculation process (weighted summation requiring multiple parameters) with a simpler mathematical operation (unweighted averaging). This substitution reduces computational burden and increases productivity while preserving measurement precision.
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 method allows for accurate sensitivity calculation with reduced computational effort, enabling more precise magnetism measurement and accurate spatial positioning of magnetic field sources using arrays of magnetic sensors.
Implementation Method 1
a magnetism collecting body for collecting a magnetic field to the sensor chip
Implementation Method 2
a sensor chip having a magnetosensitive element
Data Source
AI summary
Disclosed herein is a sensitivity measurement method for measuring a sensitivity of a magnetic sensor provided with a sensor chip having a magnetosensitive element, a magnetism collecting body for collecting a magnetic field to the sensor chip, and a housing for accommodating therein the sensor chip and the magnetism collecting body. The method includes applying a magnetic field to the magnetic sensor, and calculating the sensitivity of the magnetic sensor based on a simple average value of theoretical magnetic field strengths at a plurality of virtual sensitivity points evenly distributed inside the housing and an output value output from the senor chip.