Atomic Oscillator Thermal Resistance Layout for Frequency Stability
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Solution Overview
Problem
Atomic oscillators using the quantum interference effect face frequency stability degradation due to external temperature increases, as the heat-insulating package structure exacerbates wavelength fluctuations from the rising temperature of the light source.
Innovation Solution
A quantum interference device with a controlled thermal resistance between the atom cell module and the package, where the light source is maintained at a set temperature, and the thermal resistance is optimized to release heat effectively, ensuring the wavelength remains stable even at high environmental temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the package structure is designed with high heat insulation to reduce power consumption, then power consumption is reduced, but frequency stability degrades when external temperature increases
Solution Approach 1:
The patent applies different thermal resistance values to different parts of the support structure. The first support portion has a first thermal resistance value, while the second support portion has a second thermal resistance value that is different from the first. This local differentiation allows the structure to simultaneously insulate heat from the light source (reducing power consumption) while conducting heat away from critical components (maintaining frequency stability).
Solution Approach 2:
The support structure is divided into multiple segments with different thermal properties. By segmenting the support into portions with different thermal resistance values, the patent creates a thermal management system that can selectively block or conduct heat flow to different components, resolving the contradiction between overall heat insulation and localized heat dissipation requirements.
2Temperature
If the thermal resistance between the atom cell module and package is increased to isolate heat, then light source temperature stability improves, but heat dissipation capability deteriorates
Solution Approach 1:
Different portions of the support structure have different thermal resistance values tailored to their specific functions. The first support portion has thermal resistance optimized for stabilizing the light source temperature, while the second support portion has thermal resistance optimized for dissipating heat from the atom cell module. This local optimization resolves the contradiction between temperature stability and heat dissipation.
Solution Approach 2:
The support structure acts as an intermediary thermal management system between the light source and the package. By using portions with different thermal resistance values, it mediates the heat flow to achieve both temperature stability for the light source and effective heat dissipation from the atom cell module.
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 maintains good frequency characteristics and reduces power consumption, achieving stable operation under varying temperatures while minimizing wavelength fluctuations.
Implementation Method 1
a light source adapted to emit light for exciting the alkali metal
Implementation Method 2
a quantum interference device that uses a quantum interference effect
Implementation Method 3
a heater adapted to heat the atom cell and the light source
Implementation Method 4
defining a thermal resistance between the atom cell module and the package
Implementation Method 5
by suppressing the transfer of the heat from the unit to the package via the support
Data Source
AI summary
A quantum interference device includes an atom cell module including an atom cell in which alkali metal is encapsulated, a light source that emits light adapted to excite the alkali metal, and a heater that heats the atom cell and the light source, a package that houses the atom cell module, and a controller adapted to control drive of the heater so that the light source becomes at a set temperature, R≤(Tv−Tout)/Qv is satisfied, where R [° C./W] is a thermal resistance between the atom cell module and the package, Tv [° C.] is the set temperature, Tout [° C.] is an upper limit value of a usage environmental temperature set to a value lower than the set temperature, Qv [W] is an amount of heat generation of the light source.