Cryocooler-Sample Isolation Layout for Low-Vibration Microscopy
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Solution Overview
Problem
Existing low temperature microscopy systems face challenges in isolating cryocooled samples from vibrations caused by cooling systems while maintaining a steady sample temperature, which previous solutions have not adequately addressed.
Innovation Solution
A low vibration cryocooled system that separates the cryocooler assembly and sample housing into distinct units, using spring-damping supports and highly conductive flexible thermal straps to isolate the sample from vibrations, allowing optical access from multiple angles and maintaining temperature stability with adaptive electronic control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the cryocooler is rigidly connected to the sample housing, then the heat removal capacity is maximized, but the sample experiences vibrations from the cooling system
Solution Approach 1:
The system divides the cryocooling apparatus into separate modules: the cryocooler unit and the sample housing are physically separated and connected only through flexible thermal straps. This segmentation allows the cryocooler to be isolated from vibration transmission while maintaining thermal coupling for efficient heat removal.
Solution Approach 2:
Flexible thermal straps serve as intermediary elements between the cryocooler and sample housing. These straps provide thermal conduction for heat removal while their flexible nature prevents rigid mechanical coupling, thereby blocking vibration transmission to the sample.
2Device complexity
If the cryocooler assembly and sample housing are integrated into one unit, then the structure is simplified, but vibration isolation and optical access are compromised
Solution Approach 1:
The system is divided into distinct functional modules: a cryocooler assembly and a separate sample housing. This modular segmentation simplifies the overall structure by allowing independent optimization of each module while reducing vibration transmission through the separation itself.
Solution Approach 2:
Flexible thermal straps and bellows are used to connect the cryocooler to the sample housing. These flexible elements maintain thermal coupling while accommodating mechanical separation, enabling vibration isolation without compromising structural integrity.
3Loss of energy
If the sample is positioned on the cryocooler axis, then the heat transfer is optimized, but optical access from multiple angles is blocked
Solution Approach 1:
The sample housing is positioned off the cryocooler axis, transitioning from a one-dimensional axial arrangement to a three-dimensional configuration. This spatial repositioning allows optical access from multiple angles (top, bottom, sides) while flexible thermal straps maintain efficient heat transfer across the displaced geometry.
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 system effectively reduces sample vibrations and temperature fluctuations, enabling precise low-temperature microscopy and spectroscopy with flexible temperature control from 4 Kelvin to 300 Kelvin without turning off the cryocooler, while maintaining high heat removal capacity and optical access.
Implementation Method 1
The cryocooler assembly is supported separately from the sample chamber by spring-damping supports
Implementation Method 2
connected to the sample chamber by highly conductive small cross-section flexible thermal straps
Implementation Method 3
Low vibration cryocooled system for low temperature microscopy and spectroscopy applications
Data Source
AI summary
A vertical support rigidly mounted to a planar base positions and supports a cryocooler expander unit off axis and away from a sample to be examined. The sample support is likewise rigidly mounted to the planar base with a rigidly mounted sample housing therein. The cryocooler expander unit is suspended in the vertical support by spring dampening bearings. A pair of opposing flexible vacuum bellows connects the cryocooler expander unit to the sample housing and vertical support. This configuration isolates the sample from vibration. Flexible thermal links associated with a predictive electronic closed loop control sequence maintains sample temperature.