Compliant Thermal Interface for Dewar Endcap Cooling
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Solution Overview
Problem
Existing thermal management systems for infrared detectors and other imaging devices face challenges such as large temperature differentials, weight, inefficiency, and increased jitter due to rigid heat straps, vertical orientation constraints of heat pipes, and bulky form factors of endcap-mounted fins.
Innovation Solution
An integrated Dewar assembly with compliant endcap cooling, utilizing a thermal interface material with an amorphous pliable material that thermally couples the Dewar endcap to a heat sink without structurally coupling them, allowing for effective thermal energy transfer while minimizing mechanical energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rigid heat straps are used to thermally couple the Dewar endcap to the heat sink, then thermal energy transfer is improved, but mechanical coupling causes increased jitter and structural rigidity
Solution Approach 1:
A compliant thermal interface material is introduced as an intermediary between the Dewar endcap and the heat sink. This material provides a thermal conduction path while being mechanically compliant, allowing it to absorb vibrations and prevent structural coupling that would cause jitter. The interface material acts as a mediator that decouples the mechanical connection while maintaining thermal connection.
Solution Approach 2:
The patent changes the mechanical properties of the interface between the Dewar endcap and heat sink by using a material with specific compliance characteristics. The compliant thermal interface material has different mechanical parameters compared to rigid heat straps, allowing it to provide thermal conduction while accommodating mechanical movements and reducing jitter transmission.
2Loss of energy
If heat pipes are used for cooling, then thermal energy transfer is improved, but vertical orientation constraints increase device complexity
Solution Approach 1:
The patent extracts the orientation constraint requirement from the thermal management system by replacing heat pipes with a compliant thermal interface material approach. This eliminates the need for vertical orientation, allowing the Dewar assembly to be positioned flexibly in various orientations without compromising thermal performance.
Solution Approach 2:
The compliant thermal interface material provides dynamic adaptation to different orientations and positions, unlike rigid heat pipes that require specific vertical alignment. The material can conform to various configurations, enabling the system to operate effectively in multiple orientations and positions.
3Loss of energy
If endcap-mounted fins are used for cooling, then thermal dissipation is improved, but the bulky form factor increases device complexity
Solution Approach 1:
The patent merges the thermal dissipation function into the heat sink structure itself, eliminating the need for separate endcap-mounted fins. The heat sink is designed with enhanced surface area and optimized heat dissipation features that provide adequate cooling without requiring additional bulky fin structures on the Dewar endcap.
Solution Approach 2:
The heat sink is designed to perform multiple functions: it serves as both the thermal coupling interface and the primary heat dissipation structure. By integrating these functions into a single component, the system eliminates the need for separate fin structures, reducing overall form factor and device complexity.
4Stability of the object's composition
If the Dewar is structurally coupled to the heat sink, then mechanical stability is improved, but thermal management efficiency decreases due to heat path interference
Solution Approach 1:
The patent segments the thermal and mechanical coupling functions by using a compliant thermal interface material that provides thermal conduction while being mechanically compliant. This segmentation allows the Dewar to be thermally connected to the heat sink while maintaining mechanical stability through separate means, preventing heat path interference and improving overall thermal management efficiency.
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 solution provides improved thermal energy transfer and reduced jitter, enabling efficient cooling of infrared detectors and other imaging devices while maintaining structural compliance and reducing system weight and complexity.
Implementation Method 1
a thermal interface material to thermally couple the endcap of the Dewar to the heat sink. The thermal interface material includes an amorphous pliable material that is configured to transfer thermal energy between the endcap of the Dewar and the heat sink
Data Source
AI summary
An apparatus includes a Dewar having an endcap. The apparatus also includes a heat sink and a thermal interface material configured to thermally couple the endcap of the Dewar to the heat sink. The thermal interface material includes an amorphous pliable material that is configured to transfer thermal energy between the endcap of the Dewar and the heat sink without structurally coupling the Dewar to the heat sink. A thermal shoe may be positioned between the thermal interface material and the heat sink, and the thermal shoe may be configured to hold the thermal interface material against the endcap. The thermal shoe may have (i) a smaller cross-sectional size in a portion of the thermal shoe contacting the thermal interface material and (ii) a larger cross-sectional size in a portion of the thermal shoe contacting the heat sink.