EMR Sample Heating with Thermal Isolation for Cryogenic Resonators
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electron magnetic resonance systems face challenges in measuring liquid samples at cryogenic temperatures due to freezing and crystallization, which affect relaxation times and signal quality, while maintaining superconducting resonators at low temperatures for noise suppression.
Innovation Solution
A sample heater is thermally coupled to the sample holder, allowing the sample to be maintained at a higher temperature than the resonator, which is kept at cryogenic temperatures, using thermal insulation to minimize thermal noise and enhance signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resonator is maintained at cryogenic temperatures for noise suppression, then thermal noise is reduced and signal-to-noise ratio is improved, but the sample freezes and crystallizes affecting relaxation times and signal quality
Solution Approach 1:
The system is divided into two thermally isolated zones: the resonator is maintained at cryogenic temperatures (4K-77K) while the sample is heated to a separate temperature (77K-300K). This spatial segmentation allows each component to operate at its optimal temperature independently, resolving the contradiction between noise suppression and sample maintenance
Solution Approach 2:
A thermal isolation mechanism (vacuum insulation, thermal barriers) acts as an intermediary between the resonator and sample, preventing thermal coupling. This allows the resonator to be cooled while the sample is heated without direct thermal interference, enabling simultaneous temperature differentiation
2Adaptability or versatility
If the sample is heated to prevent freezing and crystallization, then liquid sample measurement is enabled and relaxation times are improved, but thermal noise increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The system separates the thermal environments of the resonator and sample into distinct zones. The sample can be heated to maintain liquid state and appropriate relaxation times, while the resonator remains cold for low noise operation. This segmentation allows liquid sample measurement without compromising signal-to-noise ratio
Solution Approach 2:
Different thermal conditions are applied to different parts of the system: the sample region is heated to prevent freezing and maintain liquid properties, while the resonator region is kept cold for optimal noise performance. This local differentiation of thermal quality enables both liquid sample measurement and high signal-to-noise ratio
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 enables efficient measurement of liquid samples by reducing thermal noise, enhancing signal-to-noise ratio, and allowing rapid signal averaging, thus improving the performance of electron magnetic resonance systems.
Implementation Method 1
A sample heater is thermally coupled to the sample holder
Implementation Method 2
using thermal insulation to minimize thermal noise
Data Source
AI summary
In a general aspect, an electron magnetic resonance apparatus includes a resonator that resides in a cryogenic environment in a primary magnetic field. A sample holder in the cryogenic environment is maintained in a spaced relationship with the resonator. The sample holder includes a sample container. A sample heating device is positioned so that the sample container is thermally coupled to the sample heating device, and the sample heating device controls a temperature of the sample to be in a temperature range that is above an operating temperature of the resonator.