Magnetic Field Calibration Device for Multi-Surface Sensor Arrays
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Solution Overview
Problem
Biomagnetism measuring devices with SQUID sensors require cooling with liquid helium, are costly, and have structural difficulties in having multiple measurement surfaces, leading to prolonged calibration times and mismatched results between measurement surfaces.
Innovation Solution
A magnetic field calibration device with multiple magnetism generating parts on fixed holders allows for simultaneous calibration of multiple measurement surfaces, using MR sensors that do not require liquid helium cooling, and includes coils to generate magnetic fields in three directions for accurate calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SQUID sensor is used for biomagnetism measurement, then measurement sensitivity is improved, but device scale and operation cost increase due to liquid helium cooling requirement
Solution Approach 1:
The patent changes the operating temperature parameter from cryogenic (SQUID requiring liquid helium cooling) to room temperature (MR sensor operation), thereby eliminating the need for complex cooling systems while maintaining measurement capability through different sensor physics
Solution Approach 2:
The patent replaces the mechanically complex SQUID system with liquid helium cooling infrastructure with a solid-state MR sensor system that operates at room temperature, substituting a simple mechanical cooling system with an electronic sensor system
2Measurement precision
If SQUID sensor is used for biomagnetism measurement, then measurement sensitivity is improved, but device scale and operation cost increase due to liquid helium cooling requirement
Solution Approach 1:
The patent changes the operating temperature parameter from cryogenic (SQUID requiring liquid helium cooling) to room temperature (MR sensor operation), thereby eliminating the need for expensive cooling operations while maintaining measurement capability
3Measurement precision
If calibration is performed for each measurement surface separately, then calibration accuracy is maintained, but calibration time is prolonged when there are two or more measurement surfaces
Solution Approach 1:
The patent merges multiple separate calibration operations for different measurement surfaces into a single integrated calibration process by using a calibration object with multiple holding surfaces that can be calibrated simultaneously, thereby reducing total calibration time while maintaining accuracy
Solution Approach 2:
The patent creates a universal calibration object that serves multiple functions - it can be used for calibrating multiple different measurement surfaces simultaneously, making a single calibration device applicable to multiple calibration tasks that would otherwise require separate procedures
4Measurement precision
If calibration is performed for each measurement surface separately, then individual calibration results are obtained, but results do not always match between measurement surfaces
Solution Approach 1:
The patent merges multiple calibration operations into a single simultaneous process using a calibration object with fixed relative positional relations between holding surfaces, ensuring that all measurement surfaces are calibrated against the same reference frame, thereby guaranteeing result consistency
Solution Approach 2:
The patent applies homogeneous calibration conditions across all measurement surfaces by using a calibration object where all holding surfaces have fixed, known relative positional relations, ensuring that the same calibration methodology and reference standards are applied uniformly to all surfaces
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 reduces calibration time and ensures matching results between measurement surfaces, improving the efficiency and accuracy of magnetism measurements while minimizing device size and cost.
Implementation Method 1
a magnetism generating part having a first coil wound in a first axis direction, a second coil wound in a second axis direction perpendicular to the first axis direction, and a third coil wound in a third axis direction perpendicular to both the first axis direction and second axis direction
Data Source
AI summary
A magnetic field calibration device is used to calibrate a magnetism measurement device having a plurality of magnetic sensors and includes a first holder having a first holding surface, a second holder having a second holding surface having a fixed relative positional relation with the first holding surface, and magnetism generating parts fixed to the first holding surface and the second holding surface. Thus, calibration can be completed with a single operation by assigning the first and second holding surfaces of the magnetic field calibration device respectively to the first and second measurement surfaces of the magnetism measurement device. In addition, since the relative positional relation between the first and second holding surfaces is fixed, measurement results obtained from the individual measurement surfaces match each other.