Homogenous Vapor Cell Array Assembly for Wearable Magnetometers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnetic field measurement systems, particularly for magnetoencephalography (MEG), face challenges with bulky and expensive superconducting quantum interference devices (SQUIDs) and dense arrays of discrete optically pumped magnetometers (OPMs), which limit their application to mobile or wearable devices due to maintenance and form factor issues.
Innovation Solution
A method for manufacturing an array of vapor cells using individually diced vapor cell elements, arranged and bonded in a selected configuration using an alignment jig and bonding material, allowing for flexible and defect-free assembly with tailored thermal and mechanical properties, enabling flexible array configurations and improved sensitivity for magnetic field measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an array of discrete optically pumped magnetometers (OPMs) is used, then magnetic field measurement sensitivity is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
Multiple discrete vapor cells are combined into a single integrated array assembly with shared bonding material and alignment structure, reducing the number of separate components while maintaining individual sensing capabilities of each vapor cell element
Solution Approach 2:
The bonding material serves multiple functions simultaneously: it bonds vapor cell elements together, provides thermal management, and maintains mechanical stability, eliminating the need for separate components for each function
2Measurement precision
If superconducting quantum interference devices (SQUIDs) are used, then magnetic field measurement capability is achieved, but weight and portability are worsened due to cryogenic cooling requirements
Solution Approach 1:
The patent uses non-cryogenic vapor cell technology that operates at ambient or moderate temperatures, replacing expensive and heavy cryogenic cooling systems with simpler, lighter, and more maintainable components
Solution Approach 2:
The operating temperature parameter is changed from cryogenic temperatures (required for SQUIDs) to ambient or moderate temperatures (for OPMs), fundamentally altering the system's weight and portability characteristics
3Adaptability or versatility
If vapor cell elements are assembled after individual fabrication, then manufacturing flexibility and defect isolation are improved, but assembly complexity increases
Solution Approach 1:
Vapor cell elements are pre-fabricated and tested individually before assembly, allowing defects to be identified and isolated early in the manufacturing process, and enabling selective assembly of only functional elements into the final array
Solution Approach 2:
A bonding material is introduced as an intermediary substance that facilitates the assembly of pre-fabricated vapor cell elements, providing a simple and reliable method to join components without complex fastening or welding operations
Data Source
AI summary
A method of making an array of vapor cells for an array of magnetometers includes providing a plurality of separate vapor cell elements, each vapor cell element including at least one vapor cell; arranging the vapor cell elements in an alignment jig to produce a selected arrangement of the vapor cells; attaching at least one alignment-maintaining film onto the vapor cell elements in the alignment jig; transferring the vapor cells elements and the at least one alignment-maintaining film from the alignment jig to a mold; injecting a bonding material into the mold and between the vapor cell elements to bond the vapor cell elements in the selected arrangement; removing the at least one alignment maintaining film from the vapor cell elements; and removing the bonded vapor cells elements in the selected arrangement from the mold to provide the array of vapor.