NMR Detector Superconducting Coil Meissner Effect Distortion
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Solution Overview
Problem
The use of superconducting sample coils in NMR detectors is limited by the Meissner effect, which causes distortion of the static magnetic field and reduces the Q factor of the sample coil when a sample is inserted, thereby limiting the detection sensitivity of the NMR signal.
Innovation Solution
The NMR detector employs a dual coil unit configuration with superconducting coils placed on opposing planes, ensuring that the coils do not intersect the sample when viewed orthogonally, thereby minimizing static magnetic field distortion and maintaining a high Q factor even when the sample is inserted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a superconducting sample coil is used to reduce electric resistance and increase detection sensitivity, then the Q factor and detection sensitivity are improved, but the Meissner effect causes distortion of the static magnetic field
Solution Approach 1:
The patent transitions from a conventional single-plane coil configuration to a three-dimensional立体 configuration where coil units are arranged on both the inner circumference and outer circumference of the sample container. This spatial redistribution in multiple dimensions allows the superconducting coils to generate high-frequency magnetic fields while minimizing their intersection with the sample, thereby reducing static magnetic field distortion caused by the Meissner effect.
Solution Approach 2:
The patent divides the coil system into multiple independent coil units: first and second coil units on the inner circumference, and third and fourth coil units on the outer circumference. Each coil unit can be independently controlled and optimized. This segmentation allows selective operation of coil units to minimize magnetic field distortion while maintaining detection sensitivity.
2Measurement precision
If a superconducting sample coil is used to increase detection sensitivity, then the Q factor is improved, but the Q factor decreases when a sample is inserted
Solution Approach 1:
By arranging coil units in three-dimensional space (inner and outer circumferences) rather than a single plane, the patent reduces the overlap between the coil structure and the sample. This spatial separation minimizes the dielectric loss and magnetic coupling between the sample and superconducting coils, thereby maintaining a high Q factor even when the sample is inserted.
Solution Approach 2:
The patent introduces a non-superconducting coil unit as an intermediary between the superconducting coils and the sample. This intermediate coil structure helps to decouple the direct interaction between the superconducting coils and the sample, reducing the Q factor reduction effect while still enabling effective NMR signal detection.
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 effectively suppresses the distortion of the static magnetic field and maintains a high Q factor, leading to improved detection sensitivity of the NMR signal without the limitations imposed by the Meissner effect.
Implementation Method 1
the first coil unit and the second coil unit radiate electromagnetic waves for generating a high-frequency magnetic field onto a sample placed in a static magnetic field
Implementation Method 2
the Meissner effect unique to superconductors, the static magnetic field is significantly distorted
Implementation Method 3
the sample coil detects an NMR signal from the sample
Data Source
AI summary
A sample coil for NMR detection includes a first coil unit and a second coil unit placed with a sample therebetween. In the first coil unit, a first coil and a second coil are formed on a first plane of a first substrate. In the second coil unit, a third coil and a fourth coil are formed on a second plane of a second substrate. Each of the coils is a superconducting coil. When viewed from an x direction orthogonal to the first plane and the second plane, the first coil and the second coil do not intersect the sample, and, similarly, the third coil and the fourth coil do not intersect the sample.