NMR Probe Holding Member Thermal Isolation
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Solution Overview
Problem
Conventional cooled NMR detection probes face challenges in maintaining the position of the detection module and ensuring sufficient heat transfer between the heat exchanger and the detection coil, leading to inadequate cooling and reduced sensitivity due to thermal noise and structural constraints.
Innovation Solution
The NMR detection probe design includes a holding member with an elongated portion extending along the central axis between the vacuum vessel and the internal structure, which supports the detection coil and cooling source, minimizing heat inflow and maintaining the detection module's position, allowing for efficient heat transfer and reduced thermal noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the detection module is secured to the vacuum vessel, then the position is maintained, but heat transfer from the vacuum vessel increases
Solution Approach 1:
A holding member is introduced as an intermediary component between the vacuum vessel and the detection module. This holding member provides mechanical support and position stability while being thermally isolated from the detection module, thus preventing direct heat transfer from the vacuum vessel to the cooled detection components.
Solution Approach 2:
The support structure is segmented into distinct functional zones: a holding portion that contacts the vacuum vessel for positional stability, and a detection module support portion that holds the cooled components. The elongated portion connecting these zones acts as a thermal barrier, separating the thermal environments while maintaining structural integrity.
2Measurement precision
If the detection coil is cooled, then sensitivity improves, but heat transfer path becomes complex
Solution Approach 1:
The heat transfer path is extracted and separated from the structural support function. The holding member's elongated portion is specifically designed to provide mechanical support while being thermally isolated, allowing the cooling system to operate independently with optimized heat transfer paths from the cooling source to the detection coil without interference from the vacuum vessel structure.
3Temperature
If the holding member is elongated, then heat transfer is minimized, but structural stability decreases
Solution Approach 1:
The holding member exhibits different functional properties at different locations: the outer end portion has a cross-sectional shape optimized for thermal isolation (elongated in the radial direction), while the inner end portion has a cross-sectional shape optimized for mechanical support (elongated in the axial direction). This local differentiation allows the same component to simultaneously achieve both thermal isolation and structural stability.
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 design enhances the cooling efficiency of the detection coil, maintaining its position and improving sensitivity by up to three to four times compared to previous techniques, while minimizing heat transfer and structural displacement issues.
Implementation Method 1
a holding member for holding the internal structure to the vacuum vessel above a bottom level of the vacuum vessel as viewed along the central axis. The holding member has an elongated member extending along the central axis between the vacuum vessel and the internal structure.
Implementation Method 2
cooling source for cooling the detection coil
Data Source
AI summary
A cooled NMR detection probe including a detection coil and an internal structure (65) mounted in a vacuum vessel (58) includes a radiation shield assembly (68), a connecting member (74), and a heat exchanger (80). The internal structure (65) is secured to the vacuum vessel (58) by a holding member (66). If the internal structure shrinks during cooling, the position of an upper portion of the first heat exchanger (80) hardly varies, thus suppressing displacement of a core module (54).