Vacuum-Enclosed Vapor Cell Assembly for Low-Power Atomic Sensors
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Solution Overview
Problem
Atomic sensors consume high power due to convective, conductive, and radiative heat losses from high-temperature vapor cells, necessitating efficient thermal management to reduce power consumption.
Innovation Solution
The implementation of vacuum envelopes with low thermal conductivity mounting structures, getter assemblies, and radiation shields to minimize thermal losses, along with flexible and rigid mounting structures to stabilize vapor cells, ensuring precise optical alignment and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high temperature vapor cells are used to maintain thermal equilibrium of gas phase atoms, then measurement precision is improved, but power consumption increases due to heat loss to surrounding gas molecules
Solution Approach 1:
The patent applies vacuum environment by enclosing vapor cells in a vacuum envelope, removing gas molecules that cause convective heat loss. This allows the vapor cells to maintain high temperature with reduced power consumption while preserving measurement precision.
Solution Approach 2:
The patent converts the harmful effect of thermal radiation by applying low-emissivity coatings to the vacuum envelope, transforming radiative heat loss into a minimized energy loss, thereby reducing power consumption while maintaining the high temperature required for precise measurements.
2Stability of the object's composition
If rigid mounting structures are used to stabilize vapor cells, then mechanical stability is improved, but conductive heat loss increases
Solution Approach 1:
The patent applies different thermal conductivity properties to different parts of the mounting structure. The mounting structures are designed with low thermal conductivity materials or configurations at critical contact points, providing mechanical stability while minimizing conductive heat loss from the vapor cells.
3Use of energy by moving object
If vacuum envelope is used to reduce convective heat loss, then power consumption is reduced, but mechanical support and stabilization of vapor cells becomes more challenging
Solution Approach 1:
The patent designs mounting structures that simultaneously serve multiple functions: providing mechanical support, stabilization, and thermal isolation. These multi-functional structures reduce device complexity by eliminating the need for separate components for each function while maintaining reduced power consumption.
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 configuration significantly reduces power consumption and maintains mechanical stability, enabling robust operation of atomic sensors in power-constrained environments.
Implementation Method 1
The vacuum envelope may be configured to maintain a vacuum around the vapor cells to reduce convective heat loss from within the high temperature vapor cells to gas molecules in the vacuum envelope
Implementation Method 2
Each set of mounting structures exhibits a low thermal conductivity to reduce conductive heat loss through the set of mounting structures
Implementation Method 3
each of the high temperature vapor cells includes a radiation shield, such as one or more gold layers on a polymer substrate, to reduce radiative heat transfer from the vapors cells
Implementation Method 4
The atomic sensor may include a getter assembly coupled to the vacuum envelope and configured to scavenge gas molecules in the vacuum envelope, to maintain a sufficient vacuum level
Data Source
AI summary
An assembly includes one or more high temperature vapor cells positioned along an axis of the assembly, a vacuum envelope encasing the one or more high temperature vapor cells, and one or more sets of low thermal conductivity mounting structures coupled to the vacuum envelope. Each set of low thermal conductivity mounting structures is configured to position a corresponding one of the high temperature vapor cells within the vacuum envelope.