Amorphous Alloy Cold Finger for Low-Leak Vibration-Resistant Cooling
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Solution Overview
Problem
Conventional cooling devices with thin cold fingers face challenges in maintaining thermal and mechanical performance due to deformation under operational vibrations, leading to reduced optical and thermal efficiency.
Innovation Solution
A cooling device featuring a cold finger with at least one side wall made from a partially amorphous metal alloy, specifically a hafnium-based ternary or quaternary alloy with reduced thermal conductivity, enhancing thermal insulation and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the walls of the cold finger are made thin to reduce thermal conductance, then thermal leaks are reduced and cooling efficiency is improved, but the mechanical rigidity is insufficient leading to deformation under vibration
Solution Approach 1:
The cold finger is constructed using a composite structure combining an inner core made from material with low thermal conductance (such as titanium alloy or ceramic) and an outer shell made from material with high mechanical strength (such as stainless steel or aluminum alloy). This composite construction allows the thin-walled inner core to provide thermal insulation while the outer shell provides mechanical rigidity to resist vibration-induced deformation, thereby simultaneously reducing thermal leaks and maintaining structural integrity.
Solution Approach 2:
Different sections of the cold finger walls are made with different thicknesses or material properties. The walls are designed to be thinnest in regions where thermal conductance must be minimized, while maintaining greater thickness or adding reinforcement in regions subject to high mechanical stress or vibration. This localized variation in wall quality optimizes the balance between thermal performance and mechanical strength.
2Use of energy by stationary object
If the wall thickness is reduced to minimize cooling energy expenditure, then thermal insulation is improved, but the cold finger becomes susceptible to deformation during operation
Solution Approach 1:
The composite structure of the cold finger enables the use of thin-walled inner cores made from low thermal conductance materials, which minimize cooling energy expenditure by reducing thermal leaks. The outer shell made from high-strength materials provides the necessary mechanical support to prevent deformation during operation, thereby maintaining operational reliability while optimizing energy efficiency.
Solution Approach 2:
The wall thickness parameter is optimized to a specific minimum value that provides sufficient mechanical strength to prevent deformation, rather than making the walls as thin as possible. Additionally, the material properties are selected and adjusted to achieve the optimal balance between thermal conductance and mechanical strength, ensuring both energy efficiency and operational stability.
3Loss of energy
If thin-walled cold finger is used to enhance thermal performance, then thermal conductance is reduced, but vibrations from the cooling system cause deformation and loss of optical performance
Solution Approach 1:
The composite construction of the cold finger allows the thin-walled inner core to provide low thermal conductance while the outer shell made from high-strength, vibration-resistant material protects against deformation caused by cooling system vibrations. This composite structure effectively decouples the thermal performance function from the mechanical protection function, allowing each to be optimized independently.
Solution Approach 2:
The cold finger is designed with varied wall characteristics along its length, with thicker or reinforced sections positioned at locations most susceptible to vibration-induced deformation, while maintaining thinner walls in sections where thermal insulation is the primary concern. This localized quality variation addresses vibration harm where it occurs most while preserving thermal performance.
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
The solution significantly reduces heat losses and maintains mechanical robustness, achieving improved thermal and optical performance while minimizing energy consumption.
Implementation Method 1
the at least one side wall is at least partially formed by an area made from at least partially amorphous metal alloy... so as to form a thermal insulator
Implementation Method 2
The cold finger enables thermal connection between the detection device which is to be cooled and the cooling system
Data Source
AI summary
The detection device comprises a cold finger which performs thermal connection between a detector fitted on a cooling plate and a cooling system. The cold finger comprises at least one side wall at least partially formed by an area made from the hafnium-based amorphous metal alloy. Advantageously, the whole of the cold finger is made from the hafnium-based amorphous metal alloy.