HF Resonator Assembly Overlapping Flat Coils
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Solution Overview
Problem
NMR measurement probes face challenges in achieving high sensitivity and homogeneous alternating magnetic fields when dealing with multiple nuclear species at different resonant frequencies, particularly in compact designs where components compete and couple with each other.
Innovation Solution
The HF resonator assembly features overlapping flat coils arranged on parallel and perpendicular coil support plates, allowing for the generation of two independent alternating magnetic fields with increased sensitivity and homogeneity, and efficient solvent spectral line suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple HF resonators are arranged close to the test volume to achieve high sensitivity for multiple nuclear species, then sensitivity is improved, but device complexity and component coupling increase
Solution Approach 1:
The HF resonator assembly is segmented into multiple independent resonator units, each optimized for specific nuclear species frequencies. These segmented resonators are arranged in a structured configuration that reduces mutual coupling while maintaining proximity to the test volume for high sensitivity detection
Solution Approach 2:
The patent transitions from planar coil arrangements to three-dimensional overlapping flat coil configurations. By utilizing spatial overlap in multiple dimensions, the design achieves compact integration of multiple resonators with reduced coupling, allowing sensitive detection of multiple nuclear species simultaneously
2Device complexity
If HF resonators are arranged in compact configurations to reduce probe size, then device complexity is reduced, but homogeneity of alternating magnetic field deteriorates
Solution Approach 1:
The flat coils are arranged in nested and overlapping configurations where inner coils are positioned within the spatial envelope of outer coils. This nesting approach enables compact integration while the strategic overlapping maintains uniform magnetic field distribution across the test volume
Solution Approach 2:
Different regions of the coil assembly have optimized local configurations - some areas feature overlapping coils for compactness while other regions are designed with specific spacing patterns to maintain field homogeneity. Each local region is optimized for its specific function within the overall compact structure
3Measurement precision
If flat coils are arranged to overlap completely to maximize sensitivity, then sensitivity is improved, but solvent spectral line suppression becomes less effective
Solution Approach 1:
The patent optimizes the overlap parameter of the flat coils to a specific range that balances sensitivity and solvent suppression. By controlling the degree of overlap rather than maximizing it completely, the design achieves adequate sensitivity while maintaining the field characteristics necessary for effective solvent spectral line suppression
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 enhances sensitivity at resonant frequencies and improves the homogeneity of the magnetic field, ensuring uniform nuclear spin deflection and effective solvent suppression, while maintaining a compact design.
Implementation Method 1
HF transmitter/receiver assemblies in the form of HF coils or HF resonators are arranged around this recess in the measurement probe. The HF assemblies generate alternating electromagnetic fields in the recess, and thus in the inserted sample, when HF signals are applied to the HF assemblies.
Implementation Method 2
The alternating electromagnetic fields that are emitted by the nuclear spins in the sample as a reaction to the excitation are in turn received by elements of the HF transmitter/receiver assembly.
Implementation Method 3
HF resonators that are tuned to the NMR resonant frequency of the nuclear spin to be measured (for example, the nuclear species 1H, 13C, 15N, 2H, 19F) provide particularly high sensitivity when receiving signals.
Data Source
AI summary
An HF resonator assembly generates at least two independent alternating magnetic fields in a test volume of a magnetic resonance apparatus. The HF resonator assembly includes a first pair of flat coils that form a first HF resonator and comprise electrical conductor portions that surround a planar surface portion. The flat coils are arranged on opposing sides of the test volume, on coil support plates that are mutually parallel and in parallel with the longitudinal axis. A second pair of flat coils forms a second HF resonator on second coil support plates. The projections of the planar surface portions of the flat coils in each of the first pair of flat coils and the second pair of flat coils overlap in part, but not completely, when viewed in a direction perpendicular to the respective planar surface portions.