Magnetic Moment Measurement With Shielded Sensor Arrays
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Solution Overview
Problem
Existing magnetic moment measurement methods for large-scale materials, such as core components in gravitational wave detectors, suffer from inaccurate results due to magnetization by excitation magnetic fields, long measurement cycles, complex systems, and hard-to-evaluate errors, particularly affecting precision and reliability.
Innovation Solution
A magnetic moment measurement system comprising a non-magnetic guide rail, slider, support platform, magnetic sensor array, and magnetic shielding device, combined with a computer for data acquisition and inversion algorithms, allows precise measurement by shielding external disturbances and using advanced data processing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mechanical measurement method with a high-sensitivity torsion pendulum device is used to measure the magnetic moment of a core component, then the measurement result is affected by fluctuation of the geomagnetic field and the to-be-measured material is magnetized by the excitation magnetic field, but the measurement cycle is long, lasting about two weeks
Solution Approach 1:
The patent replaces the mechanical torsion pendulum measurement system with a magnetic measurement system using magnetic sensors and inversion algorithms. This substitution eliminates the need for mechanical torque measurement and long waiting periods, reducing the measurement cycle from two weeks to a much shorter duration while maintaining or improving measurement accuracy through computational methods.
Solution Approach 2:
The patent applies preliminary magnetization to the core component before measurement. By pre-magnetizing the sample to a known saturation state, the measurement process is simplified and accelerated, as the magnetic moment can be directly calculated from the measured magnetic field distribution without requiring long stabilization periods or complex mechanical measurements.
2Productivity
If a magnetic measurement method measuring a magnetic field vector of the to-be-measured material in the geomagnetic field is used, then the magnetic moment is obtained by inversion according to a mathematical relationship, but the measurement accuracy is greatly affected due to instability and inhomogeneity of the geomagnetic field
Solution Approach 1:
The patent extracts and removes the geomagnetic field interference from the measurement system by using a magnetically shielded environment. This isolation allows the magnetic sensors to measure only the magnetic field generated by the core component itself, eliminating the confounding effects of geomagnetic field instability and inhomogeneity on measurement accuracy.
Solution Approach 2:
The patent introduces a magnetic shield as an intermediary between the external environment and the measurement system. This shield acts as a barrier that blocks external magnetic field fluctuations, creating a controlled measurement environment where the geomagnetic field's instability and inhomogeneity do not affect the measurement of the core component's magnetic moment.
3Reliability
If a mechanical measurement method is used to measure the magnetic moment of a core component, then the measurement results are affected by fluctuation of the geomagnetic field, but the system complexity is high and error evaluation is difficult
Solution Approach 1:
The patent replaces the complex mechanical torsion pendulum system with a simpler magnetic measurement system using magnetic sensors and computational inversion. This substitution reduces mechanical complexity while improving reliability by eliminating sensitivity to geomagnetic field fluctuations through magnetic shielding and controlled measurement environments.
Solution Approach 2:
The patent employs inversion algorithms that automatically calculate the magnetic moment from measured magnetic field distributions. This self-service computational approach eliminates the need for complex mechanical calibration and error evaluation procedures, simplifying the measurement process while maintaining high reliability through mathematical rigor.
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 system achieves high accuracy of 1.48 nA·m2 to 1.74 nA·m2, significantly reducing measurement errors and cycles while simplifying the process, making it suitable for high-precision applications like gravitational wave detection.
Implementation Method 1
A magnetic field distribution of the to-be-measured material in the space is measured with a magnetic sensor array
Implementation Method 2
the magnetic sensor array are located in the magnetic shielding device
Data Source
AI summary
Provided is a magnetic moment measurement system and method, which belong to the technical field of magnetic moment measurement, and solve the problems of insufficient accuracy, low efficiency, and vulnerability to disturbance from an external magnetic field in the existing magnetic moment measurement technique. The magnetic moment measurement method includes the following steps: acquiring a magnetic field vector and a magnetic gradient tensor at a center of a magnetic sensor array through the magnetic sensor array; calculating an angle of a magnetic moment vector; and according to the angle of the magnetic moment vector, selecting a corresponding magnetic moment inversion formula, and calculating the magnetic moment vector. By constructing the magnetic sensor array, and using the advanced inversion algorithm, this application not only significantly improves the magnetic moment measurement accuracy, but also greatly shortens the measurement cycle, simplifies the measurement system, and reduces the measurement error.