Atomic Magnetometer Array for Dynamic Magnetic Field Measurement

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Magnetometer systems face inaccuracies due to sensitivity to dynamics and system misalignments when measuring whole field scalar measurements, particularly in dynamic environments, as they often rely on multiple single-axis or dual-axis vector systems.

Innovation Solution

A magnetometer system comprising an array of magnetometers with sensor cells filled with alkali metal vapor, generating predetermined AC magnetic fields, and utilizing a laser system for pulsed optical pump and probe beams to calculate scalar and vector components of the external magnetic field, along with a magnetic field tensor processor to determine magnetic field gradients.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple single-axis or dual-axis vector systems are used to measure whole field scalar measurements, then the magnetometer system can detect external magnetic field in three vector axes, but the system exhibits sensitivity to dynamics or system misalignments resulting in inaccuracy

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidstability in dynamic environment

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system divides the measurement task into multiple independent single-axis or dual-axis vector magnetometers arranged in an array, where each magnetometer measures specific components of the magnetic field. This segmentation allows the system to achieve accurate whole field scalar measurements by combining results from multiple independent measurement units, reducing sensitivity to dynamics and misalignments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent replaces traditional mechanical alignment and stabilization systems with an optical detection system using laser beams and vapor cells. The system uses optical pumping and detection methods to measure magnetic field components, eliminating mechanical sensitivity issues and providing stable measurements in dynamic environments through non-contact optical interrogation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If whole field scalar magnetometer systems are implemented for high sensitivity and stability in dynamic environments, then measurement stability is improved, but the system complexity increases compared to vector systems

Engineering Contradiction:

Improvestability in dynamic environmentVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Each magnetometer in the array is designed as a multi-functional unit that can measure multiple magnetic field components (scalar and vector measurements) simultaneously. This universality allows the system to achieve high stability in dynamic environments while maintaining manageable complexity by using identical standardized modules for multiple measurement functions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system transitions from measuring only magnetic field strength to measuring both scalar and vector components by adding spatial dimensionality through the array configuration. Each magnetometer measures field components along different axes, and the combined array provides three-dimensional magnetic field characterization, enabling stable whole field scalar measurements without requiring overly complex single-unit designs.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 approach enhances the accuracy and stability of magnetic field measurements by enabling precise calculation of scalar and vector components and magnetic field gradients, improving sensitivity and reliability in dynamic environments.

Implementation Method 1

a laser system to provide optical pump and probe beams through the sensor cell in a pulsed manner to facilitate precession of the alkali metal vapor

Methodology Applied

Scientific EffectOptical pumping:

Implementation Method 2

The detection beam exhibits an optical property corresponding to a modified precession of the alkali metal vapor based on the plurality of predetermined AC magnetic fields and an external magnetic field

Methodology Applied

Scientific EffectPrecession: Precession

Data Source

PatentEP3940409B1Atomic magnetometer system

Publication Date: 2023.06.07 NORTHROP GRUMMAN SYSTEMS CORP

Figure 1~2
Figure 3~4

AI summary

One example includes a magnetometer that includes a sensor cell comprising alkali metal vapor and a magnetic field generator system that generates predetermined AC magnetic fields through the sensor cell. The magnetometer also includes a laser system to provide optical pump and probe beams through the sensor cell in a pulsed manner to facilitate precession of the alkali metal vapor and to provide a detection beam corresponding to the optical probe beam exiting the sensor cell. The detection beam exhibits an optical property corresponding to a modified precession of the alkali metal vapor based on the predetermined AC magnetic fields and an external magnetic field. The magnetometer also includes a detection system to monitor the detection beam to detect the modified precession of the alkali metal vapor to calculate scalar and vector components of the external magnetic field based on the plurality of predetermined AC magnetic fields.