Radical Pair Magnetic Field Sensing at Room Temperature

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Solution Overview

Problem

Existing magnetic field measuring devices require operation under low temperature environments and have limited space resolution, making them impractical for certain applications.

Innovation Solution

A magnetic field measuring method and system utilizing a first and second particle with radical pairs to generate output light based on coupling strength, allowing for the calculation of magnetic field strength through readout signals without the need for low temperature conditions and enabling adjustable space resolution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional magnetic field measuring devices are used, then measurement capability is provided, but operation requires very low temperature environments and space resolution cannot be adjusted

Engineering Contradiction:

Improvetemperature environment adaptabilityVSAvoidmeasurement reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the operating temperature parameter from very low temperatures to room temperature by using radical pair systems in biological molecules, which maintain quantum coherence at physiological temperatures. This allows the measuring device to operate in versatile temperature environments while maintaining measurement reliability through the inherent stability of radical pair spin states

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces conventional mechanical/physical magnetic field sensing mechanisms with quantum mechanical radical pair systems. The radical pair mechanism uses spin chemistry and quantum coherence effects instead of traditional magnetometer components, enabling operation at room temperature while maintaining sensitivity through the magnetic field-dependent spin dynamics of the radical pairs

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If conventional magnetic field measuring devices are used, then measurement is possible, but space resolution is not adjustable

Engineering Contradiction:

Improvespace resolution adjustabilityVSAvoidmagnetic field measurement precision

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent introduces dynamic adjustability of space resolution by controlling the distance between the first and second particles in the radical pair system. By dynamically adjusting the inter-particle distance, the system can modulate the coupling strength and thereby control the spatial resolution of magnetic field measurements, allowing adaptation to different measurement requirements while maintaining precision through optimized coupling conditions

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If particle distance is increased, then space resolution improves, but coupling strength decreases

Engineering Contradiction:

Improvespace resolutionVSAvoidcoupling strength

Core Design Contradiction:

Measurement precisionVSStrength

Solution Approach 1:

The patent employs periodic modulation of the laser excitation to maintain and enhance the coupling strength between particles even at larger separations. By using periodic laser pulsing synchronized with the radical pair dynamics, the system can compensate for the natural decay of coupling strength with distance, thereby maintaining both high space resolution and sufficient coupling strength for accurate magnetic field measurement

Inventive Principle:

Principle #19Periodic action

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

Enables sensitive magnetic field measurements with a sensitivity of approximately 1nT/√{Hz} and space resolutions smaller than 10 nanometers, overcoming the limitations of existing technologies.

Implementation Method 1

utilizing a first particle and a second particle with radical pairs to generate output light based on coupling strength

Methodology Applied

Scientific EffectRadical pair mechanism:

Implementation Method 2

applying a magnetic field to a first particle and a second particle; generating a first output light by the first particle according to the magnetic field and a first coupling strength between the first particle and the second particle

Methodology Applied

Scientific EffectMagnetic field effect on radical pairs:

Data Source

PatentUS12385987B2Magnetic field measuring method, magnetic field measuring system and magnetic field measuring apparatus

Publication Date: 2025.08.12 HON HAI PRECISION INDUSTRY CO LTD

AI summary

A magnetic field measuring method includes: applying a magnetic field to a first particle and a second particle; generating a first output light by the first particle according to the magnetic field and a first coupling strength between the first particle and the second particle; and calculating a strength of the magnetic field according to a strength of the first output light. A magnetic field measuring system and a magnetic field measuring apparatus are also disclosed herein.