Magnetic Sensor Array for Weak Biological Field Measurement
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Solution Overview
Problem
Conventional magnetic field measuring apparatuses face challenges in accurately measuring weak biological magnetic fields, such as the cardiac magnetic field, due to interference from disturbance magnetic fields, which affects precision and reliability in heart condition assessment.
Innovation Solution
A magnetic field measuring apparatus with a magnetic sensor array capable of detecting input magnetic fields in three axial directions, featuring a feedback magnetic field generation mechanism to reduce input magnetic fields and a signal space separation section for isolating the cardiac magnetic field from disturbance fields, utilizing magnetoresistive elements and magnetic flux concentrators for enhanced sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a pair of magnetic detection elements are stacked in a magnetic field detection direction to suppress disturbance magnetic fields, then disturbance magnetic field suppression is improved, but measurement precision of weak biological magnetic fields deteriorates
Solution Approach 1:
The magnetic sensor array is divided into multiple independent sensor units, each capable of detecting magnetic fields in three axial directions. This segmentation allows for more flexible arrangement and signal processing to distinguish weak biological magnetic fields from disturbance fields.
Solution Approach 2:
The invention transitions from one-dimensional stacking of magnetic detection elements to three-dimensional magnetic field detection using multiple sensor units arranged in space. Each sensor unit detects magnetic fields in three axial directions (x, y, z), enabling spatial differentiation of magnetic field sources and improving the ability to separate disturbance fields from biological magnetic fields through signal space separation.
2Measurement precision
If a magnetic sensor array with three-axis detection capability is used to enhance measurement precision, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Each magnetic sensor unit in the array is designed to detect magnetic fields in three axial directions simultaneously, making each sensor multi-functional. This universal design allows the same sensor structure to be reused throughout the array, reducing overall system complexity despite the enhanced measurement capability.
Solution Approach 2:
The invention implements a feedback mechanism where measurement data from the magnetic sensor array is processed through signal space separation to calculate an indicator of calibration accuracy. This feedback loop enables automatic calibration and compensation, reducing the need for complex manual calibration procedures and maintaining measurement precision without proportionally increasing operational complexity.
3Measurement precision
If signal space separation and calibration indication mechanisms are implemented to improve calibration accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The magnetic sensor array system performs self-calibration through signal space separation techniques. By analyzing the spatial distribution of magnetic fields and comparing measurements across multiple sensor units, the system automatically identifies and corrects calibration errors without requiring external calibration equipment or manual intervention, thereby improving calibration accuracy while minimizing added complexity.
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 achieves improved precision in measuring weak biological magnetic fields by effectively suppressing disturbance fields and enhancing sensitivity, allowing for more accurate heart condition assessments and cardiac magnetic field measurements.
Implementation Method 1
Each of the plurality of magnetic sensor cells 220 includes a magnetoresistive element 710
Implementation Method 2
two magnetic flux concentrators 720, 730 arranged on both ends of the magnetoresistive element 710
Implementation Method 3
a first magnetic field generation section 530 configured to generate a feedback magnetic field B_FB corresponding to the output signal VxMR, and apply the feedback magnetic field B_FB
Data Source
AI summary
Provided is a magnetic field measuring apparatus, comprising: a magnetic sensor array including a plurality of magnetic sensor cells, which is capable of detecting an input magnetic field in three axial directions at a plurality of locations in three-dimensional space; a measurement data acquiring section for acquiring measurement data based on the input magnetic field including a to-be-measured magnetic field; and a measurement data computing section for calibrating the measurement data acquired by the measurement data acquiring section; wherein the measurement data computing section comprises: an indicator calculation section for calculating an indicator illustrating calibration accuracy of the measurement data computing section; and a failure determination section for determining a failure based on the indicator calculated by the indicator calculation section; wherein each of the plurality of magnetic sensor cells comprises: a magnetic sensor; and an output section for outputting a output signal.