3D Magnetic Sensor Array for Cardiac Field Reconstruction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current magnetic field measurement devices face challenges in accurately detecting and reconstructing three-dimensional cardiac magnetic fields with minimal disturbance from environmental fields, particularly in distinguishing measurement target fields from noise.
Innovation Solution
A magnetic field measurement device comprising a three-dimensionally arranged magnetic sensor array with magnetoresistive elements and magnetic flux concentrators, capable of detecting three-axial magnetic fields, and featuring a feedback magnetic field generation unit to reduce input magnetic fields, along with signal separation and reconstruction units to isolate the measurement target field components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic sensor array is used to detect cardiac magnetic fields, then measurement capability is improved, but environmental magnetic field disturbances increase measurement noise
Solution Approach 1:
The patent applies signal space separation technology to convert the harmful effect of environmental magnetic fields into a separable signal component. By modeling the measurement space as a combination of cardiac magnetic field signal space and environmental noise space, the system identifies and extracts the cardiac signal from the composite measurement, effectively converting the harmful mixed signal into a useful separated component.
Solution Approach 2:
The patent extracts the cardiac magnetic field signal from the composite measurement by separating it from environmental disturbances. Through signal space separation, the system identifies the signal subspace corresponding to cardiac activity and extracts this component, leaving behind the environmental noise in the orthogonal subspace.
2Measurement precision
If three-axial magnetic field detection is implemented, then measurement completeness is improved, but system complexity increases
Solution Approach 1:
The patent transitions from traditional two-dimensional sensor arrays to three-dimensional spatial sampling configurations. By arranging sensors in three-dimensional space and utilizing signal space separation in the spectral domain, the system achieves complete three-axial magnetic field detection while managing complexity through mathematical decomposition rather than physical complexity.
3Measurement precision
If signal space separation is applied, then signal-to-noise ratio is improved, but computational complexity increases
Solution Approach 1:
The patent replaces complex physical shielding mechanisms with mathematical signal processing methods. Instead of using physical barriers to block environmental magnetic fields, the system uses signal space separation algorithms to computationally separate and remove noise components, substituting mechanical/physical solutions with information-processing solutions.
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 effectively reconstructs cardiac magnetic fields with high accuracy, separating measurement target fields from disturbances, enabling precise detection and visualization of current maps, even without a magnetically shielded room.
Implementation Method 1
Each of the magnetic sensors may include a magnetoresistive element and two magnetic flux concentrators arranged at both ends of the magnetoresistive element
Implementation Method 2
two magnetic flux concentrators arranged at both ends of the magnetoresistive element. The magnetoresistive element may be arranged at a position sandwiched by the two magnetic flux concentrators
Implementation Method 3
The magnetic field generation unit may include a feedback coil that is wrapped along an axial direction of a magnetic field to be detected by the magnetic sensor so as to surround the magnetoresistive element and the two magnetic flux concentrators
Data Source
AI summary
Provided is a magnetic field measurement device which includes a magnetic sensor array that is composed of a plurality of magnetic sensor cells, each of which has a magnetic sensor and an output unit for outputting an output signal, arranged at lattice points between two curved surfaces, each of which is bent in one direction, so as to be three-dimensionally arranged, and is capable of detecting an input magnetic field in three-axial directions, a measurement data acquisition unit configured to acquire measurement data measured by the magnetic sensor array, and a magnetic field reconstruction unit configured to reconstruct a magnetic field of a component orthogonal to a virtual sensor array plane with respect to one or more positions on the virtual sensor array plane, which is a plane specified in a three-dimensional space, using the measurement data.