Thermal Isolation Die Heater for Alkali Vapor Pressure Control
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Solution Overview
Problem
Alkali metal-based atom sensors face high vapor pressure issues due to the low melting points of Rubidium and Cesium, leading to reduced atomic sample lifetime from collisions with background vapor.
Innovation Solution
The use of binary alloys such as Rubidium-Indium, Rubidium-Lead, or Rubidium-Gallium, and graphite intercalation compounds with controlled vapor pressure, combined with a thermal isolation die for precise temperature control, to maintain lower vapor pressures and extend sensor operation temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If alkali metal (Rubidium or Cesium) is used in atom based sensors, then the sensor can operate at lower temperatures, but the vapor pressure becomes excessively high causing background vapor collisions that limit atomic sample lifetime
Solution Approach 1:
The patent uses composite materials by forming alloys of alkali metals with other metals (such as Rubidium-Indium, Rubidium-Lead, or Rubidium-Gallium) or using graphite intercalation compounds. These composite materials have lower vapor pressures than pure alkali metals at the same temperature, reducing background vapor collisions and extending atomic sample lifetime while maintaining operational temperature benefits.
2Quantity of substance
If the alkali metal source temperature is increased to improve vapor pressure control, then vapor pressure increases, but background vapor collisions increase and atomic sample lifetime decreases
Solution Approach 1:
The patent changes the material parameters by using alloys and graphite intercalation compounds instead of pure alkali metals. This material parameter change allows the system to achieve desired vapor pressure levels at lower temperatures, thereby reducing background vapor density and minimizing collisions that would otherwise limit atomic sample lifetime.
3Temperature
If pure alkali metal is used in the atomic source, then the melting point is low enabling easy operation, but the vapor pressure is excessively high causing harmful background vapor collisions
Solution Approach 1:
The patent applies composite materials by creating alloys of alkali metals with other metals or using graphite intercalation compounds. These composites maintain the low melting point advantage of alkali metals for easy operation while significantly reducing the vapor pressure that causes harmful background vapor collisions with the atomic sample.
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 allows for reduced vapor pressure in atom-based sensors, enhancing the operational lifetime and stability of atomic samples by using binary alloys and graphite intercalation compounds to manage alkali vapor pressure effectively.
Implementation Method 1
a heating element mounted on the isolated portion and configured to heat the atomic source
Implementation Method 2
a thermal isolation die mounted to the body. The thermal isolation die is disposed in a location that communicates with the at least one sensing chamber
Implementation Method 3
an alkali metal source that releases alkali metal atoms to form an alkali vapor in a sensing chamber
Data Source
AI summary
In one embodiment, a chip scale atomic sensor is provided. The chip scale atomic sensor includes a body that defines at least one sensing chamber. The body includes a thermal isolation die mounted to the body. The thermal isolation die is disposed in a location that communicates with the at least one sensing chamber. The thermal isolation die includes a substrate defining a frame portion and an isolated portion and a plurality of tethers mechanically coupling the isolated portion of the substrate to the frame portion. The thermal isolation die also includes an atomic source mounted on the isolated portion of the substrate, and a heating element mounted on the isolated portion and configured to heat the atomic source.