Solid Sample NMR Probe Idler Coil Inductive Coupling
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Solution Overview
Problem
In solid-state Magic Angle Spinning (MAS) NMR, it is challenging to minimize circuit filling factor losses due to the inductance of leads connecting variable capacitors to the parent coil, which reduces the flux penetrating the sample and degrades signal quality.
Innovation Solution
The introduction of an idler coil that inductively couples to the parent coil, allowing for adjustable variable capacitance to create a double resonance circuit, thereby overcoming the limitations of prior art coils and enhancing signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable capacitors are used to adjust the frequency of the parent coil in solid-state MAS NMR, then frequency tuning is enabled, but circuit filling factor losses increase due to lead inductance
Solution Approach 1:
The patent introduces an idler coil as an intermediary component that couples inductively to the parent coil. This idler coil serves as a mediator to transfer energy and enable frequency tuning without requiring direct leads from the variable capacitor to the parent coil, thereby eliminating the harmful lead inductance while preserving the frequency adjustment capability
Solution Approach 2:
The patent replaces the traditional capacitive coupling mechanism (which requires physical leads connecting variable capacitors to the parent coil) with an inductive coupling mechanism using the idler coil. This substitution eliminates the mechanical lead connections that cause inductance losses while achieving the same frequency tuning function
2Adaptability or versatility
If leads connect variable capacitors to the parent coil for frequency adjustment, then frequency tuning is achieved, but signal quality degrades due to reduced flux penetration
Solution Approach 1:
The idler coil acts as an intermediary that enables frequency tuning through inductive coupling without requiring direct lead connections to the parent coil. This eliminates the lead inductance that would otherwise reduce flux penetration and degrade signal quality, while still allowing effective frequency adjustment
Solution Approach 2:
The patent extracts and removes the problematic lead connections from the circuit by introducing the idler coil as an alternative coupling path. The idler coil is positioned to couple inductively to the parent coil, effectively taking out the harmful lead inductance while preserving the frequency tuning function
3Adaptability or versatility
If capacitive coupling is used for double-tuned probes, then multi-nucleus detection is enabled, but circuit losses increase
Solution Approach 1:
The patent substitutes capacitive coupling with inductive coupling through the idler coil for achieving double-tuned probes. This inductive coupling mechanism enables multi-nucleus detection while reducing circuit losses compared to traditional capacitive coupling methods
Solution Approach 2:
The patent changes the coupling parameter from capacitive to inductive by introducing the idler coil. This parameter change allows the system to achieve double-tuned operation for multi-nucleus detection while improving energy efficiency and reducing circuit losses
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 approach enables improved signal-to-noise ratio and efficient energy distribution between nuclei resonances, optimizing the circuit fill factor and maintaining RF homogeneity, allowing for simultaneous detection of multiple nuclei without signal degradation.
Implementation Method 1
The introduction of an idler coil that inductively couples to the parent coil, allowing for adjustable variable capacitance to create a double resonance circuit
Implementation Method 2
Solid sample magnetic coupling high resolution nuclear magnetic resolution probe and method of use
Data Source
AI summary
In various embodiments of the invention, a solid sample magic angle spinning nuclear magnetic resonance (NMR) probe can utilize an appropriate inductance parent coil with a fixed capacitor and introducing an idler coil with a variable capacitor which can inductively couple to the parent coil by adjusting the variable capacitance of the idler coil. By coupling the idler coil to the parent coil in this manner a double resonance circuit can be provided without the disadvantages of prior art coils. In an alternative embodiment of the invention, a solid sample magic angle spinning nuclear magnetic resonance probe can utilize an appropriate inductance parent coil with a fixed capacitor, introducing an idler coil with a variable capacitor in a first region and two variable inductor coupling coils and two coupling coils in a second region, where the two variable inductors are connected to the parent coil to reduce the number of coils in the sample region of the NMR probe, where variable inductors can inductively couple to the parent coil by adjusting one or both the capacitance of the variable capacitor of the idler coil and/or adjusting the variable inductors to observe a tuned condition between the parent coil and the idler coil.