Optically Pumped Magnetometer Multi-Channel Measurement via Bias Field Segmentation
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Solution Overview
Problem
Existing optically pumped magnetometers face complexity in constituting a multi-channel measurement system for magnetic field strengths.
Innovation Solution
The optically pumped magnetometer includes a cell filled with alkali metal vapor, pump and probe light units, bias magnetic field coils, an electron spin tilting unit, an optical sensor, and a magnetic field measuring unit. This configuration allows for multi-channel measurement by applying different bias magnetic fields to multiple sensitivity regions using a single ray of probe light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple probe lights are used for multi-channel measurement, then measurement channels can be increased, but the optical system becomes complicated
Solution Approach 1:
The patent combines multiple measurement functions into a single probe light path by using bias magnetic field coils to create different resonance frequencies in different sensitivity regions. Instead of using separate probe lights for each channel, one probe light measures magnetic fields in multiple regions simultaneously by detecting frequency differences caused by different bias fields, thereby merging multiple measurement channels into a unified optical path.
Solution Approach 2:
The patent changes the magnetic field parameter (bias magnetic field strength) in different sensitivity regions to create distinct resonance frequencies. By applying different bias magnetic fields to different regions, the system enables multi-channel measurement through frequency discrimination rather than through separate optical paths, thus maintaining a simple optical system while achieving multi-channel capability.
2Measurement precision
If bias magnetic field coils are added for each sensitivity region, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent makes the bias magnetic field coils serve multiple functions: they not only provide the necessary bias field for each sensitivity region but also create the frequency discrimination mechanism that enables multi-channel measurement. The same coils that establish resonance frequencies also serve as the measurement differentiation mechanism, eliminating the need for separate components and reducing overall device complexity.
Solution Approach 2:
The patent segments the measurement space into multiple sensitivity regions, each with its own bias magnetic field coil. This segmentation allows independent control of magnetic field parameters in each region, enabling precise multi-channel measurement. By dividing the measurement function across spatially separated coils rather than using a single complex system, the patent achieves both precision and modularity.
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 solution enables simple and effective multi-channel measurement of magnetic field strengths, reducing the complexity of the optical system while maintaining measurement accuracy.
Implementation Method 1
pump light for pumping alkali metal atoms constituting the alkali metal vapor
Implementation Method 2
probe light for detecting change in electron spins in a pumped state of the alkali metal atoms
Implementation Method 3
bias magnetic field coils configured to apply a bias magnetic field in the first direction to the inside of the cell and determine a resonance frequency of the electron spins
Implementation Method 4
electron spin tilting unit configured to tilt a rotation axis direction of the electron spins in a direction perpendicular to the first direction
Data Source
AI summary
An optically pumped magnetometer includes a cell, a pump light incidence unit causing pump light to be incident on a plurality of sensitivity regions inside the cell in a first direction, a probe light incidence unit causing probe light to be incident on the sensitivity regions in a direction intersecting the first direction, bias magnetic field coils applying a bias magnetic field to the inside of the cell and determining a resonance frequency of the electron spins, an electron spin tilting unit tilting a rotation axis direction of the electron spins in a direction perpendicular to the first direction, an optical sensor detecting the probe light; and a magnetic field measuring unit measuring magnetic field strengths related to the sensitivity regions, wherein the bias magnetic field coils respectively apply a plurality of the bias magnetic fields having strengths different from each other to the plurality of corresponding sensitivity regions.