Angled Light Input for Compact OPM Arrays
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Solution Overview
Problem
Conventional magnetic field measurement systems, particularly those using optically pumped magnetometers (OPMs) for magnetoencephalography (MEG), face limitations such as the need for cryogenic cooling in SQUIDs, bulky size, high maintenance costs, and restricted spatial resolution due to thermal management and magnetic cross-talk issues, making them unsuitable for mobile or wearable devices.
Innovation Solution
An optically pumped magnetometer device incorporating a prism optic to redirect light beams at non-normal angles into the vapor cell, allowing for compact, efficient, and high-resolution magnetic field measurement systems that can operate in unshielded environments, enabling wearable MEG applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional OPMs are used with single vapor cells in 1 to 2 cm packages, then device compactness is improved, but spatial resolution is hindered
Solution Approach 1:
The invention divides the single vapor cell into multiple segmented vapor cells arranged in an array. Each vapor cell can be independently addressed and controlled, allowing for high spatial resolution measurements while maintaining a compact overall device package. The segmentation enables parallel operation of multiple sensing elements within a small volume.
Solution Approach 2:
The invention transitions from a single-point measurement approach to a multi-dimensional array of vapor cells. By arranging vapor cells in two or three dimensions, the system achieves high spatial resolution across multiple locations simultaneously, effectively adding spatial dimensions to the measurement capability while keeping each individual cell compact.
2Measurement precision
If discrete magnetometers are used to achieve high spatial resolution, then measurement precision is improved, but thermal management and magnetic cross talk become problematic
Solution Approach 1:
The invention merges multiple vapor cells into a closely integrated array where thermal and magnetic environments are coordinated. By combining the vapor cells in a unified structure with shared thermal management and magnetic shielding, the system achieves high spatial resolution without the independent thermal management complexity that would arise from completely discrete magnetometers.
Solution Approach 2:
The vapor cell array structure serves multiple functions simultaneously: it provides high spatial resolution through multiple sensing elements, enables coordinated thermal management through shared thermal pathways, and reduces magnetic cross-talk through unified magnetic shielding. This multi-functionality eliminates the need for separate complex subsystems for each function.
3Measurement precision
If SQUIDs are used for MEG measurement, then measurement sensitivity is improved, but device weight and maintenance requirements increase
Solution Approach 1:
The invention replaces expensive, fragile SQUID systems with more robust optically pumped magnetometers that do not require cryogenic cooling. The OPM vapor cells are solid-state devices with no moving parts or cryogenic requirements, making them lighter, more durable, and suitable for portable applications while maintaining high magnetic field sensitivity.
4Ease of manufacture
If conventional light beam geometry is used in OPMs, then ease of manufacture is improved, but device complexity increases due to additional optical components
Solution Approach 1:
The invention merges the light beam redirecting function directly into the vapor cell structure itself. By incorporating reflective surfaces or angularly oriented windows into the vapor cell housing, the system eliminates the need for separate prism or mirror components, reducing optical component count and simplifying assembly while maintaining the necessary angled beam geometry for compact operation.
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 enables high spatial resolution and sensitivity in measuring magnetic fields without the need for cryogenic cooling, facilitating the development of portable and cost-effective magnetic field measurement systems capable of operating outside magnetically shielded rooms.
Implementation Method 1
a first prism optic configured to receive the first light beam from the first light source and redirect the first light beam into the first vapor cell at a non-normal direction relative to the light input window of the first vapor cell
Implementation Method 2
optically pumped magnetometer device that includes a first vapor cell having a light input window; a first light source configured to produce a first light beam
Data Source
AI summary
An optically pumped magnetometer device includes a first vapor cell having a light input window; a first light source configured to produce a first light beam; a first prism optic configured to receive the first light beam from the first light source and redirect the first light beam into the first vapor cell at a non-normal direction relative to the light input window of the first vapor cell; and a first light detector configured to receive the first light beam after passing through the first vapor cell. The device may also include additional light sources and light detectors which may share the prism optic and vapor cell (or utilize another prism optic or vapor cell or both).