NMR-MAS Probehead External Tilt Mechanism
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Solution Overview
Problem
Existing NMR-MAS probeheads face challenges in achieving high precision and reproducibility of angle adjustment, especially over a wide temperature range, due to the compactness of their design and the need for precise mechanical components, which increases manufacturing costs and reduces RF performance.
Innovation Solution
The design of an NMR-MAS probehead with an external adjustment mechanism that tilts the entire probehead against the static magnetic field, allowing for larger dimensions of the adjustment mechanism and better insulation against temperature changes, thereby reducing the mechanical precision requirements and maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the adjustment mechanism is integrated into the probehead, then the angle adjustment precision can be improved, but the device complexity and manufacturing costs increase due to the need for compact precise mechanical components
Solution Approach 1:
The adjustment mechanism is extracted from the probehead and placed in the magnet system instead. This allows the adjustment mechanism to be larger and less complex while achieving the same angle adjustment precision, resolving the contradiction between precision and complexity
Solution Approach 2:
The probehead is tilted as an intermediary to achieve angle adjustment. By tilting the entire probehead rather than adjusting components within it, the system achieves precise angle control without requiring complex internal mechanical adjustments
2Adaptability or versatility
If the adjustment mechanism is integrated into the probehead, then the angle adjustment range can be improved, but the RF performance deteriorates due to the compact design constraints
Solution Approach 1:
The adjustment mechanism is taken out of the probehead, allowing the probehead to be optimized for RF performance without compromising angle adjustment range. The external adjustment mechanism provides the necessary adaptability without interfering with RF characteristics
3Manufacturing precision
If the adjustment mechanism is integrated into the probehead, then the mechanical precision requirements can be improved, but the manufacturing costs increase due to the need for high-precision components in a compact space
Solution Approach 1:
The adjustment mechanism is extracted from the compact probehead environment and placed in the magnet system where larger, less expensive components can be used. This eliminates the need for costly high-precision miniaturized components while maintaining manufacturing precision
Solution Approach 2:
Instead of making the probehead adjustable through complex internal mechanisms, the invention inverts the approach by making the entire probehead tiltable through external adjustment, simplifying the manufacturing requirements
Data Source
AI summary
A probehead of an NMR-MAS apparatus includes a sample which has a rotation axis tilted by an angle θ>0 with respect to the z-axis. The angle θ can be adjusted about a target angle θtarget by tilting around a tilt axis. The rotation axis has a fixed angle with respect to the probehead, and the NMR-MAS apparatus tilts at least part of the probehead to adjust the angle θ. The probehead has an outer contour K between an upper end and a lower end. For all z between the upper end and the lower end, a cross-section S(z) of the contour K exists parallel to the xy-plane with a width Q(z) in the x-direction. The width Q(z) is smaller at points away from z=0, such that Q(z1)<Q(0) and Q(z2)<Q(0) for z1<0 and z2>0.